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mmc: sdhci-of-at91: wait for calibration done before proceed

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commit af467fad78f03a42de8b72190f6a595366b870db upstream.

Datasheet specifies that at the end of calibration the SDMMC_CALCR_EN
bit will be cleared. No commands should be send before calibration is
done.

Fixes: dbdea70f71 ("mmc: sdhci-of-at91: fix CALCR register being rewritten")
Fixes: 727d836a37 ("mmc: sdhci-of-at91: add DT property to enable calibration on full reset")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210924082851.2132068-2-claudiu.beznea@microchip.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Claudiu Beznea 2021-09-24 11:28:50 +03:00 committed by Greg Kroah-Hartman
parent e5cb3680b9
commit 3a0feae5f6
1 changed files with 6 additions and 0 deletions
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6
drivers/mmc/host/sdhci-of-at91.c
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@ -11,6 +11,7 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/mmc/host.h>
#include <linux/mmc/slot-gpio.h>
@ -114,6 +115,7 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_at91_priv *priv = sdhci_pltfm_priv(pltfm_host);
unsigned int tmp;
sdhci_reset(host, mask);
@ -126,6 +128,10 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask)
sdhci_writel(host, calcr | SDMMC_CALCR_ALWYSON | SDMMC_CALCR_EN,
SDMMC_CALCR);
if (read_poll_timeout(sdhci_readl, tmp, !(tmp & SDMMC_CALCR_EN),
10, 20000, false, host, SDMMC_CALCR))
dev_err(mmc_dev(host->mmc), "Failed to calibrate\n");
}
}