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misc: rtsx: Add short delay after exit from ASPM 

commit 7a839dbab1 upstream.

DMA transfers to and from the SD card stall for 10 seconds and run into
timeout on RTS5260 card readers after ASPM was enabled.

Adding a short msleep after disabling ASPM fixes the issue on several
Dell Precision 7530/7540 systems I tested.

This function is only called when waking up after the chip went into
power-save after not transferring data for a few seconds. The added
msleep does therefore not change anything in data transfer speed or
induce any excessive waiting while data transfers are running, or the
chip is sleeping. Only the transition from sleep to active is affected.

Signed-off-by: Klaus Doth <kdlnx@doth.eu>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/4434eaa7-2ee3-a560-faee-6cee63ebd6d4@doth.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Klaus Doth 2020-05-22 12:56:04 +02:00 committed by Greg Kroah-Hartman
parent e64b205035
commit a5b4b3f97d
1 changed files with 3 additions and 0 deletions
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3
drivers/misc/cardreader/rtsx_pcr.c
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@ -143,6 +143,9 @@ static void rtsx_comm_pm_full_on(struct rtsx_pcr *pcr)
rtsx_disable_aspm(pcr);
/* Fixes DMA transfer timout issue after disabling ASPM on RTS5260 */
msleep(1);
if (option->ltr_enabled)
rtsx_set_ltr_latency(pcr, option->ltr_active_latency);