Commit 7a839dba authored by Klaus Doth's avatar Klaus Doth Committed by Greg Kroah-Hartman

misc: rtsx: Add short delay after exit from ASPM

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: default avatarKlaus Doth <kdlnx@doth.eu>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/4434eaa7-2ee3-a560-faee-6cee63ebd6d4@doth.euSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1ea34b29
...@@ -142,6 +142,9 @@ static void rtsx_comm_pm_full_on(struct rtsx_pcr *pcr) ...@@ -142,6 +142,9 @@ static void rtsx_comm_pm_full_on(struct rtsx_pcr *pcr)
rtsx_disable_aspm(pcr); rtsx_disable_aspm(pcr);
/* Fixes DMA transfer timout issue after disabling ASPM on RTS5260 */
msleep(1);
if (option->ltr_enabled) if (option->ltr_enabled)
rtsx_set_ltr_latency(pcr, option->ltr_active_latency); rtsx_set_ltr_latency(pcr, option->ltr_active_latency);
......
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