[PATCH 6.6 084/102] mmc: core: Add HS400 tuning in HS400es initialization

Greg Kroah-Hartman
2024-05-23T13:27:06Z

From: Mengqi Zhang <mengqi.zhang@mediatek.com>

commit 77e01b49e35f24ebd1659096d5fc5c3b75975545 upstream.

During the initialization to HS400es stage, add a HS400 tuning flow as an
optional process. For Mediatek IP, the HS400es mode requires a specific
tuning to ensure the correct HS400 timing setting.

Signed-off-by: Mengqi Zhang <mengqi.zhang@mediatek.com>
Link: https://lore.kernel.org/r/20231225093839.22931-2-mengqi.zhang@mediatek.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Cc: "Lin Gui (桂林)" <Lin.Gui@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mmc/core/mmc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1819,8 +1819,13 @@ static int mmc_init_card(struct mmc_host

if (err)
goto free_card;
-
- } else if (!mmc_card_hs400es(card)) {
+ } else if (mmc_card_hs400es(card)) {
+ if (host->ops->execute_hs400_tuning) {
+ err = host->ops->execute_hs400_tuning(host, card);
+ if (err)
+ goto free_card;
+ }
+ } else {
/* Select the desired bus width optionally */
err = mmc_select_bus_width(card);
if (err > 0 && mmc_card_hs(card)) {