linux-kernel - [PATCH AUTOSEL 5.15 050/153] mmc: sdhci: Disable SD card clock before changing parameters

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Message-Id: <20250505231320.2695319-50-sashal@kernel.org>
Date: Mon,  5 May 2025 19:11:37 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Erick Shepherd <erick.shepherd@...com>,
	Kyle Roeschley <kyle.roeschley@...com>,
	Brad Mouring <brad.mouring@...com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-mmc@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 050/153] mmc: sdhci: Disable SD card clock before changing parameters

From: Erick Shepherd <erick.shepherd@...com>

[ Upstream commit fb3bbc46c94f261b6156ee863c1b06c84cf157dc ]

Per the SD Host Controller Simplified Specification v4.20 §3.2.3, change
the SD card clock parameters only after first disabling the external card
clock. Doing this fixes a spurious clock pulse on Baytrail and Apollo Lake
SD controllers which otherwise breaks voltage switching with a specific
Swissbit SD card.

Signed-off-by: Kyle Roeschley <kyle.roeschley@...com>
Signed-off-by: Brad Mouring <brad.mouring@...com>
Signed-off-by: Erick Shepherd <erick.shepherd@...com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Link: https://lore.kernel.org/r/20250211214645.469279-1-erick.shepherd@ni.com
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mmc/host/sdhci.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c0900b2f7b5c8..97eeb0c61baec 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2009,10 +2009,15 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 
 	host->mmc->actual_clock = 0;
 
-	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+	clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+	if (clk & SDHCI_CLOCK_CARD_EN)
+		sdhci_writew(host, clk & ~SDHCI_CLOCK_CARD_EN,
+			SDHCI_CLOCK_CONTROL);
 
-	if (clock == 0)
+	if (clock == 0) {
+		sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
 		return;
+	}
 
 	clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
 	sdhci_enable_clk(host, clk);
-- 
2.39.5