From 891f75ee567c5f674f45925baf506dfe454f4aff Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= Date: Fri, 16 Mar 2018 20:31:55 +0100 Subject: [PATCH 015/389] mmc: add delay after power class selection This seems to fix issue with sporadic ETIMEOUT in eMMC cache initialization on second generation TBS A711 tablet. Signed-off-by: Ondrej Jirman --- drivers/mmc/core/mmc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 89cd48fcec79..47a61e48d55c 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1833,6 +1833,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, */ mmc_select_powerclass(card); + msleep(20); + /* * Enable HPI feature (if supported) */ @@ -1851,6 +1853,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } } + msleep(20); + /* * If cache size is higher than 0, this indicates the existence of cache * and it can be turned on. Note that some eMMCs from Micron has been -- 2.35.3