mmc: dw_mmc: Add data CRC error injection

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This driver has had problems when handling data errors.  Add fault
injection support so that the abort handling can be easily triggered and
regression-tested.  A hrtimer is used to indicate a data CRC error at
various points during the data transfer.

Note that for the recent problem with hangs in the case of some data CRC
errors, a udelay(10) inserted at the start of send_stop_abort() greatly
helped in triggering the error, but I've not included this as part of
the fault injection support since it seemed too specific.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Link: https://lore.kernel.org/r/20210701080534.23138-1-vincent.whitchurch@axis.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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Vincent Whitchurch 2021-07-01 10:05:34 +02:00 • committed by Ulf Hansson

parent 696068470e

commit 2b8ac062f3

2 changed files with 80 additions and 0 deletions

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73

drivers/mmc/host/dw_mmc.c

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7

drivers/mmc/host/dw_mmc.h

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