linux-kernel - [v1,1/1] mmc: core: Add HS400es support in retune and initialization flow

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Message-ID: <20231201030547.11553-1-mengqi.zhang@mediatek.com>
Date:   Fri, 1 Dec 2023 11:05:47 +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: [v1,1/1] mmc: core: Add HS400es support in retune and initialization flow

In HS400es mode, when we enter mmc_retune(), we will be forced to
the HS400 mode instead of HS400es mode. So we decided to add support
for HS400es in the mmc_retune() process.

Additionally, during the initialization to the HS400es stage, add
hs400 tuning as an optional process.

Signed-off-by: Mengqi Zhang <mengqi.zhang@...iatek.com>
---
 drivers/mmc/core/host.c | 11 ++++++++++-
 drivers/mmc/core/mmc.c  | 10 +++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 096093f7be00..4bddbbb3d539 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -179,7 +179,7 @@ EXPORT_SYMBOL(mmc_retune_release);
 int mmc_retune(struct mmc_host *host)
 {
 	bool return_to_hs400 = false;
-	int err;
+	int err = 0;
 
 	if (host->retune_now)
 		host->retune_now = 0;
@@ -194,6 +194,15 @@ int mmc_retune(struct mmc_host *host)
 	host->doing_retune = 1;
 
 	if (host->ios.timing == MMC_TIMING_MMC_HS400) {
+		if (host->ios.enhanced_strobe) {
+			if (host->ops->execute_hs400_tuning) {
+				mmc_retune_disable(host);
+				err = host->ops->execute_hs400_tuning(host, host->card);
+				mmc_retune_enable(host);
+			}
+			goto out;
+		}
+
 		err = mmc_hs400_to_hs200(host->card);
 		if (err)
 			goto out;
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 705942edacc6..9760eea2c104 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1823,7 +1823,15 @@ 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) {
+			mmc_retune_disable(host);
+			err = host->ops->execute_hs400_tuning(host, card);
+			mmc_retune_enable(host);
+			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