linux-kernel - [PATCH v3 1/1] mmc: core: Add HS400 tuning in HS400es initialization

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Date: Mon, 25 Dec 2023 17:38:40 +0800
From: Mengqi Zhang <mengqi.zhang@...iatek.com>
To: <ulf.hansson@...aro.org>, <chaotian.jing@...iatek.com>,
	<matthias.bgg@...il.com>, <mengqi.zhang@...iatek.com>,
	<wenbin.mei@...iatek.com>
CC: <yangyingliang@...wei.com>, <adrian.hunter@...el.com>,
	<avri.altman@....com>, <vincent.whitchurch@...s.com>,
	<linux-mmc@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 1/1] mmc: core: Add HS400 tuning in HS400es initialization

During the initialization to HS400es stage, add hs400 tuning flow as an
optional process. For Mediatek IP, HS00es mode requires a specific
tuning to ensure the correct HS400 timing setting.

Signed-off-by: Mengqi Zhang <mengqi.zhang@...iatek.com>
---
v1 https://patchwork.kernel.org/project/linux-mediatek/patch/20231201030547.11553-1-mengqi.zhang@mediatek.com/
v2 https://patchwork.kernel.org/project/linux-mediatek/patch/20231222062236.26370-1-mengqi.zhang@mediatek.com/
---
 drivers/mmc/core/mmc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 705942edacc6..d5173a9bb4b0 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1822,8 +1822,13 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 
 		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)) {
-- 
2.25.1