Revert "mmc: sdhci: Disable SD card clock before changing parameters"

commit dcc3bcfc5b50c625b475dcc25d167b6b947a6637 upstream.

It has turned out the trying to strictly conform to the SDHCI specification
is causing problems. Let's revert and start over.

This reverts commit fb3bbc46c94f261b6156ee863c1b06c84cf157dc.

Cc: Erick Shepherd <erick.shepherd@ni.com>
Cc: stable@vger.kernel.org
Fixes: fb3bbc46c94f ("mmc: sdhci: Disable SD card clock before changing parameters")
Suggested-by: Adrian Hunter <adrian.hunter@intel.com>
Reported-by: Jonathan Liu <net147@gmail.com>
Reported-by: Salvatore Bonaccorso <carnil@debian.org>
Closes: https://bugs.debian.org/1108065
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20250624110932.176925-1-ulf.hansson@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3d601a3f31c1ecbf57b480a4ec167b2634cbef77..9091930f585916040489f815d5d37fea0afc659c 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2010,15 +2010,10 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 
        host->mmc->actual_clock = 0;
 
-       clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
-       if (clk & SDHCI_CLOCK_CARD_EN)
-               sdhci_writew(host, clk & ~SDHCI_CLOCK_CARD_EN,
-                       SDHCI_CLOCK_CONTROL);
+       sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
 
-       if (clock == 0) {
-               sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+       if (clock == 0)
                return;
-       }
 
        clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
        sdhci_enable_clk(host, clk);