linux-kernel - [PATCH] mmc: sdhci-tegra: Issue CMD and DAT resets together

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Message-ID: <20220912132728.18383-1-pshete@nvidia.com>
Date:   Mon, 12 Sep 2022 18:57:28 +0530
From:   Prathamesh Shete <pshete@...dia.com>
To:     <adrian.hunter@...el.com>, <ulf.hansson@...aro.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <p.zabel@...gutronix.de>, <linux-mmc@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <anrao@...dia.com>, <smangipudi@...dia.com>, <pshete@...dia.com>
Subject: [PATCH] mmc: sdhci-tegra: Issue CMD and DAT resets together

In case of error condition to avoid system crash
Tegra SDMMC controller requires CMD and DAT resets
issued together.

This is applicable to Tegar186 and later chips.

Signed-off-by: Aniruddha TVS Rao <anrao@...dia.com>
Signed-off-by: Prathamesh Shete <pshete@...dia.com>
---
 drivers/mmc/host/sdhci-tegra.c |  3 ++-
 drivers/mmc/host/sdhci.c       | 10 ++++++++--
 drivers/mmc/host/sdhci.h       |  2 ++
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 2d2d8260c681..0a82cbedabe4 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -1525,7 +1525,8 @@ static const struct sdhci_pltfm_data sdhci_tegra186_pdata = {
 		  SDHCI_QUIRK_NO_HISPD_BIT |
 		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
 		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
-	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+		   SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER,
 	.ops  = &tegra186_sdhci_ops,
 };
 
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 7689ffec5ad1..89ede0cf674a 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3063,8 +3063,14 @@ static bool sdhci_request_done(struct sdhci_host *host)
 		 * Spec says we should do both at the same time, but Ricoh
 		 * controllers do not like that.
 		 */
-		sdhci_do_reset(host, SDHCI_RESET_CMD);
-		sdhci_do_reset(host, SDHCI_RESET_DATA);
+		if (host->quirks2 &
+			SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER) {
+			sdhci_do_reset(host, SDHCI_RESET_CMD |
+					SDHCI_RESET_DATA);
+		} else {
+			sdhci_do_reset(host, SDHCI_RESET_CMD);
+			sdhci_do_reset(host, SDHCI_RESET_DATA);
+		}
 
 		host->pending_reset = false;
 	}
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 95a08f09df30..111e9bf98dde 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -480,6 +480,8 @@ struct sdhci_host {
  * block count.
  */
 #define SDHCI_QUIRK2_USE_32BIT_BLK_CNT			(1<<18)
+/* Issue CMD and DATA reset together */
+#define SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER	(1<<19)
 
 	int irq;		/* Device IRQ */
 	void __iomem *ioaddr;	/* Mapped address */
-- 
2.17.1