diff options
| author | Eugen Hristev <eugen.hristev@microchip.com> | 2020-05-27 13:56:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-17 16:42:07 +0200 |
| commit | 1c4aa8dc1d1140448a8f42c0e8fd097b86165740 (patch) | |
| tree | 1fa11eeb6dfe054c086474291cffd993c342b4e2 | |
| parent | 9d204a66643fa0f03d6f15c4ceb6cb7df3dc15e8 (diff) | |
mmc: sdhci-of-at91: fix CALCR register being rewritten
commit dbdea70f71d672c12bc4454e7c258a8f78194d74 upstream.
When enabling calibration at reset, the CALCR register was completely
rewritten. This may cause certain bits being deleted unintentedly.
Fix by issuing a read-modify-write operation.
Fixes: 727d836a375a ("mmc: sdhci-of-at91: add DT property to enable calibration on full reset")
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Link: https://lore.kernel.org/r/20200527105659.142560-1-eugen.hristev@microchip.com
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/mmc/host/sdhci-of-at91.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c index fcef5c0d0908..b6cb205d2d95 100644 --- a/drivers/mmc/host/sdhci-of-at91.c +++ b/drivers/mmc/host/sdhci-of-at91.c @@ -136,9 +136,12 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask) || mmc_gpio_get_cd(host->mmc) >= 0) sdhci_at91_set_force_card_detect(host); - if (priv->cal_always_on && (mask & SDHCI_RESET_ALL)) - sdhci_writel(host, SDMMC_CALCR_ALWYSON | SDMMC_CALCR_EN, + if (priv->cal_always_on && (mask & SDHCI_RESET_ALL)) { + u32 calcr = sdhci_readl(host, SDMMC_CALCR); + + sdhci_writel(host, calcr | SDMMC_CALCR_ALWYSON | SDMMC_CALCR_EN, SDMMC_CALCR); + } } static const struct sdhci_ops sdhci_at91_sama5d2_ops = { |