mini uart (ttyS0) does not support parity. #1561
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The right way to handle missing features is to unset the requested features in the termios structure in set_termios. |
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Closing due to lack of activity. Reopen if you feel this issue is still relevant. |
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I understand that it looks as if nobody cares. But IMHO it is still a "should be fixed one day", so I vote for leaving it open. I can understand that you want to clean up the "clutter" in the issue list. I don't know if you can tag it in such a way that it doesn't bother your "overview" on the issue list...... |
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I agree - it shouldn't be hard to fix this one. |
pelwell
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The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]>
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There's a patch in the rpi-4.9.y kernel tree that implements this feature. It will be in the next rpi-update firmware release. |
popcornmix
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May 21, 2017
kernel: usb/serial/ch341: Add parity support See: raspberrypi/linux#1863 kernel: config: Add FB_TFT_ST7789V module See: raspberrypi/linux#1474 kernel: config: Add CONFIG_I2C_ROBOTFUZZ_OSIF See: raspberrypi/linux#2017 kernel: config: Add CONFIG_TOUCHSCREEN_EDT_FT5X06 See: raspberrypi/linux#2014 kernel: config: Drop CONFIG_TOUCHSCREEN_EKTF2127 See: raspberrypi/linux#1941 kernel: config: Add Goodix touch controller module See: raspberrypi/linux#1609 kernel: serial: 8250: Add CAP_MINI, set for bcm2835aux See: raspberrypi/linux#1561
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May 21, 2017
kernel: usb/serial/ch341: Add parity support See: raspberrypi/linux#1863 kernel: config: Add FB_TFT_ST7789V module See: raspberrypi/linux#1474 kernel: config: Add CONFIG_I2C_ROBOTFUZZ_OSIF See: raspberrypi/linux#2017 kernel: config: Add CONFIG_TOUCHSCREEN_EDT_FT5X06 See: raspberrypi/linux#2014 kernel: config: Drop CONFIG_TOUCHSCREEN_EKTF2127 See: raspberrypi/linux#1941 kernel: config: Add Goodix touch controller module See: raspberrypi/linux#1609 kernel: serial: 8250: Add CAP_MINI, set for bcm2835aux See: raspberrypi/linux#1561
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Should be in latest rpi-update kernel. Please test and close if happy. |
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May 24, 2017
The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]>
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May 25, 2017
The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: raspberrypi/linux#1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
pelwell
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
pelwell
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
pelwell
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Jul 9, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: raspberrypi/linux#1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]>
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Jul 13, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Jul 13, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Jul 16, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Jul 16, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Jul 21, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Jul 21, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Jul 29, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]>
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Aug 13, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]>
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Aug 23, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Aug 25, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Aug 30, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Please update to the latest kernel which may contain a fix for this issue. |
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Yes - the patch was even accepted upstream. |
popcornmix
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Sep 13, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
popcornmix
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Sep 14, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
popcornmix
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Sep 22, 2017
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
popcornmix
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Oct 29, 2017
The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: #1561 Signed-off-by: Phil Elwell <[email protected]>
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commit 6d2aa31 Author: Phil Elwell <[email protected]> Date: Fri May 19 15:07:27 2017 +0100 serial: 8250: Add CAP_MINI, set for bcm2835aux The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: raspberrypi/linux#1561 Signed-off-by: Phil Elwell <[email protected]> Gbp-Pq: Topic rpi Gbp-Pq: Name rpi_1262_6d2aa3189f388747791fc2871812d134d6f1730f.patch
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The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: raspberrypi#1561 Signed-off-by: Phil Elwell <[email protected]>
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commit 3792dd9 Author: Phil Elwell <[email protected]> Date: Fri May 19 15:07:27 2017 +0100 serial: 8250: Add CAP_MINI, set for bcm2835aux The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: raspberrypi/linux#1561 Signed-off-by: Phil Elwell <[email protected]> Gbp-Pq: Topic rpi Gbp-Pq: Name rpi_1264_3792dd925c797d259830a7c4781a67b845c0c061.patch
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commit 3792dd9 Author: Phil Elwell <[email protected]> Date: Fri May 19 15:07:27 2017 +0100 serial: 8250: Add CAP_MINI, set for bcm2835aux The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: raspberrypi/linux#1561 Signed-off-by: Phil Elwell <[email protected]> Gbp-Pq: Topic rpi Gbp-Pq: Name rpi_1264_3792dd925c797d259830a7c4781a67b845c0c061.patch
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Jul 2, 2024
commit d087e7a upstream. The AUX/mini-UART in the BCM2835 family of procesors is a cut-down 8250 clone. In particular it is lacking support for the following features: CSTOPB PARENB PARODD CMSPAR CS5 CS6 Add a new capability (UART_CAP_MINI) that exposes the restrictions to the user of the termios API by turning off the unsupported features in the request. N.B. It is almost possible to automatically discover the missing features by reading back the LCR register, but the CSIZE bits don't cooperate (contrary to the documentation, both bits are significant, but CS5 and CS6 are mapped to CS7) and the code is much longer. See: raspberrypi/linux#1561 Signed-off-by: Phil Elwell <[email protected]> Acked-by: Eric Anholt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Seth Forshee <[email protected]>
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This is clearly documented in the "peripherals" datasheet.
However, when an application requests parity (it is required for STM32 bootloader communication) the driver simply writes the data to the register and does not notice that it doesn't stick....
I've looked into the tty/serial/8250 driver, and the LCR gets written quite often. IMHO it would be proper if the driver returns "can't do that sir" when you request a feature that isn't available on this implementation. We could detect the "doesn't exist" feature when detecting the port (write a 1 to the PE bit, read it back. If it comes back zero, the feature isn't there) Once detected at initialization time we need to check for the flag on "setting termios" time... Or we could try to do this "live" at setting termios time.
As far as my research has reached so far, this both runs into the trouble that all the set_termios functions cannot return error as they either return void or simply "return 0;".
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