linux-kernel - [PATCH 5.14 022/151] mmc: sdhci-of-at91: wait for calibration done before proceed

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Message-Id: <20211011134518.569881128@linuxfoundation.org>
Date:   Mon, 11 Oct 2021 15:44:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.14 022/151] mmc: sdhci-of-at91: wait for calibration done before proceed

From: Claudiu Beznea <claudiu.beznea@...rochip.com>

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: dbdea70f71d67 ("mmc: sdhci-of-at91: fix CALCR register being rewritten")
Fixes: 727d836a375ad ("mmc: sdhci-of-at91: add DT property to enable calibration on full reset")
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20210924082851.2132068-2-claudiu.beznea@microchip.com
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mmc/host/sdhci-of-at91.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/mmc/host/sdhci-of-at91.c
+++ b/drivers/mmc/host/sdhci-of-at91.c
@@ -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 sdhc
 {
 	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 sdhc
 
 		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");
 	}
 }