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mmc: tmio: set max_busy_timeout

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Set max_busy_timeouts for variants known to support the TOPxx bits in
the SD_OPTION register. The timeout mechanism was running in the
background but not yet properly handled in the driver. So, let the MMC
core know when to not use R1B to avoid unhandled timeouts.

My datasheets for older variants (tmio_mmc.c) suggest that they support
it, too. However, actual bit descriptions are lacking, so I chose an
opt-in approach.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20201125213001.15003-2-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wolfram Sang
2020-11-25 22:29:59 +01:00
committed by Ulf Hansson
parent 9d348477dd
commit 30ae3e13ca
5 changed files with 27 additions and 1 deletions
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7
include/linux/mfd/tmio.h
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@@ -55,7 +55,12 @@
*/
#define TMIO_MMC_HAS_IDLE_WAIT BIT(4)
/* BIT(5) is unused */
/*
* Use the busy timeout feature. Probably all TMIO versions support it. Yet,
* we don't have documentation for old variants, so we enable only known good
* variants with this flag. Can be removed once all variants are known good.
*/
#define TMIO_MMC_USE_BUSY_TIMEOUT BIT(5)
/*
* Some controllers have CMD12 automatically