linux-kernel - [PATCH V2 1/2] mmc: core: Add host specific tuning support for SD HS mode

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Date:   Tue, 15 Aug 2023 09:40:56 +0800
From:   Wenchao Chen <wenchao.chen@...soc.com>
To:     <ulf.hansson@...aro.org>, <adrian.hunter@...el.com>
CC:     <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <wenchao.chen666@...il.com>, <zhenxiong.lai@...soc.com>,
        <chunyan.zhang@...soc.com>, <yuelin.tang@...soc.com>,
        Wenchao Chen <wenchao.chen@...soc.com>
Subject: [PATCH V2 1/2] mmc: core: Add host specific tuning support for SD HS mode

Added .prepare_hs_tuning and .execute_hs_tuning host callbacks to
support host-specific tuning for SD high speed mode.

Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>
---
 drivers/mmc/core/sd.c    | 12 ++++++++++++
 include/linux/mmc/host.h |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 246ce027ae0a..ac2da8f2fbce 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1518,6 +1518,12 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 		 */
 		mmc_set_clock(host, mmc_sd_get_max_clock(card));
 
+		if (host->ops->prepare_hs_tuning) {
+			err = host->ops->prepare_hs_tuning(host, card);
+			if (err)
+				goto free_card;
+		}
+
 		/*
 		 * Switch to wider bus (if supported).
 		 */
@@ -1529,6 +1535,12 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 
 			mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
 		}
+
+		if (host->ops->execute_hs_tuning) {
+			err = host->ops->execute_hs_tuning(host, card);
+			if (err)
+				goto free_card;
+		}
 	}
 cont:
 	if (!oldcard) {
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 461d1543893b..13cf894b9e3c 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -184,6 +184,12 @@ struct mmc_host_ops {
 	/* Execute HS400 tuning depending host driver */
 	int	(*execute_hs400_tuning)(struct mmc_host *host, struct mmc_card *card);
 
+	/* Prepare HS tuning depending host driver */
+	int	(*prepare_hs_tuning)(struct mmc_host *host, struct mmc_card *card);
+
+	/* Execute HS tuning depending host driver */
+	int	(*execute_hs_tuning)(struct mmc_host *host, struct mmc_card *card);
+
 	/* Prepare switch to DDR during the HS400 init sequence */
 	int	(*hs400_prepare_ddr)(struct mmc_host *host);
 
-- 
2.17.1