USB: serial: pl2303: account for deficits of clones #6689
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There are apparently incomplete clones of the HXD type chip in use. Those return -EPIPE on GET_LINE_REQUEST and BREAK_REQUEST. Avoid flooding the kernel log with those errors. Detect them during startup and then use the line_settings cache instead of GET_LINE_REQUEST. Signal missing break support via -ENOTTY. Signed-off-by: Jan Kiszka <[email protected]> [ johan: fix macro prefix, drop oom error message ] Signed-off-by: Johan Hovold <[email protected]>
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See: raspberrypi/linux#6689 kernel: Revert "firmware: raspberrypi: Add backward compatible get_throttled" See: raspberrypi/linux#6697 kernel: RP1 DPI: interlaced HSync/VSync alignment (6.12) See: raspberrypi/linux#6695 kernel: dtoverlays: ov9281: Add continuous clock option as an override See: raspberrypi/linux#6700 kernel: Fix clang compilation error for rpi5 See: raspberrypi/linux#6699 kernel: drm/vc4: Correct one logging message that got promoted from dbg to err See: raspberrypi/linux#6702
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See: raspberrypi/linux#6689 kernel: Revert "firmware: raspberrypi: Add backward compatible get_throttled" See: raspberrypi/linux#6697 kernel: RP1 DPI: interlaced HSync/VSync alignment (6.12) See: raspberrypi/linux#6695 kernel: dtoverlays: ov9281: Add continuous clock option as an override See: raspberrypi/linux#6700 kernel: Fix clang compilation error for rpi5 See: raspberrypi/linux#6699 kernel: drm/vc4: Correct one logging message that got promoted from dbg to err See: raspberrypi/linux#6702
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There are apparently incomplete clones of the HXD type chip in use. Those return -EPIPE on GET_LINE_REQUEST and BREAK_REQUEST. Avoid flooding the kernel log with those errors. Detect them during startup and then use the line_settings cache instead of GET_LINE_REQUEST. Signal missing break support via -ENOTTY.
[ johan: fix macro prefix, drop oom error message ]