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

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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>
This commit is contained in:
Ulf Hansson 2025-06-24 13:09:32 +02:00 • committed by Greg Kroah-Hartman
commit e7e914942b
1 changed files with 2 additions and 7 deletions
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9
drivers/mmc/host/sdhci.c
View file

@ -1708,15 +1708,10 @@ 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);