linux-kernel - [PATCH v2 3/4] mmc: sdhci-tegra: Issue CMD and DAT resets together

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Message-ID: <20220914095628.26093-3-pshete@nvidia.com>
Date:   Wed, 14 Sep 2022 15:26:27 +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>,
        <kyarlagadda@...dia.com>
Subject: [PATCH v2 3/4] 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 Tegra186 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       | 11 ++++++++---
 drivers/mmc/host/sdhci.h       |  2 ++
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index b66b0cc51497..7d16dc41fe91 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -1530,7 +1530,8 @@ 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..289fa8ae4866 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3063,9 +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..8045308f7859 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