linux-kernel - [PATCH v2] mmc: sdhci-of-esdhc: fix quirk to ignore command inhibit for data

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Message-Id: <20230321203715.3975-1-georgy.kruglov@yandex.ru>
Date:   Tue, 21 Mar 2023 23:37:15 +0300
From:   Georgii Kruglov <georgy.kruglov@...dex.ru>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Georgii Kruglov <georgy.kruglov@...dex.ru>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Yangbo Lu <yangbo.lu@....com>, Yinbo Zhu <yinbo.zhu@....com>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: [PATCH v2] mmc: sdhci-of-esdhc: fix quirk to ignore command inhibit for data

If spec_reg is equal to 'SDHCI_PRESENT_STATE', esdhc_readl_fixup()
fixes up register value and returns it immediately. As a result, the
further block
(spec_reg == SDHCI_PRESENT_STATE)
    &&(esdhc->quirk_ignore_data_inhibit == true),
is never executed.

The patch merges the second block into the first one.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 1f1929f3f2fa ("mmc: sdhci-of-esdhc: add quirk to ignore command inhibit for data")
Signed-off-by: Georgii Kruglov <georgy.kruglov@...dex.ru>
---
v2: Drop the redundant '== true' as Adrian Hunter <adrian.hunter@...el.com> suggested.
 drivers/mmc/host/sdhci-of-esdhc.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 4712adac7f7c..48ca1cf15b19 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -133,6 +133,7 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host,
 			return ret;
 		}
 	}
+
 	/*
 	 * The DAT[3:0] line signal levels and the CMD line signal level are
 	 * not compatible with standard SDHC register. The line signal levels
@@ -144,6 +145,16 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host,
 		ret = value & 0x000fffff;
 		ret |= (value >> 4) & SDHCI_DATA_LVL_MASK;
 		ret |= (value << 1) & SDHCI_CMD_LVL;
+
+		/*
+		 * Some controllers have unreliable Data Line Active
+		 * bit for commands with busy signal. This affects
+		 * Command Inhibit (data) bit. Just ignore it since
+		 * MMC core driver has already polled card status
+		 * with CMD13 after any command with busy siganl.
+		 */
+		if (esdhc->quirk_ignore_data_inhibit)
+			ret &= ~SDHCI_DATA_INHIBIT;
 		return ret;
 	}
 
@@ -158,19 +169,6 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host,
 		return ret;
 	}
 
-	/*
-	 * Some controllers have unreliable Data Line Active
-	 * bit for commands with busy signal. This affects
-	 * Command Inhibit (data) bit. Just ignore it since
-	 * MMC core driver has already polled card status
-	 * with CMD13 after any command with busy siganl.
-	 */
-	if ((spec_reg == SDHCI_PRESENT_STATE) &&
-	(esdhc->quirk_ignore_data_inhibit == true)) {
-		ret = value & ~SDHCI_DATA_INHIBIT;
-		return ret;
-	}
-
 	ret = value;
 	return ret;
 }
-- 
2.34.1