linux-kernel - [PATCH 5.1 012/405] mmc: sdhci-iproc: Set NO_HISPD bit to fix HS50 data hold time problem

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Message-Id: <20190530030541.060952274@linuxfoundation.org>
Date:   Wed, 29 May 2019 20:00:10 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Trac Hoang <trac.hoang@...adcom.com>,
        Scott Branden <scott.branden@...adcom.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.1 012/405] mmc: sdhci-iproc: Set NO_HISPD bit to fix HS50 data hold time problem

From: Trac Hoang <trac.hoang@...adcom.com>

commit ec0970e0a1b2c807c908d459641a9f9a1be3e130 upstream.

The iproc host eMMC/SD controller hold time does not meet the
specification in the HS50 mode.  This problem can be mitigated
by disabling the HISPD bit; thus forcing the controller output
data to be driven on the falling clock edges rather than the
rising clock edges.

Stable tag (v4.12+) chosen to assist stable kernel maintainers so that
the change does not produce merge conflicts backporting to older kernel
versions. In reality, the timing bug existed since the driver was first
introduced but there is no need for this driver to be supported in kernel
versions that old.

Cc: stable@...r.kernel.org # v4.12+
Signed-off-by: Trac Hoang <trac.hoang@...adcom.com>
Signed-off-by: Scott Branden <scott.branden@...adcom.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/sdhci-iproc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/mmc/host/sdhci-iproc.c
+++ b/drivers/mmc/host/sdhci-iproc.c
@@ -220,7 +220,8 @@ static const struct sdhci_iproc_data ipr
 
 static const struct sdhci_pltfm_data sdhci_iproc_pltfm_data = {
 	.quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
-		  SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
+		  SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 |
+		  SDHCI_QUIRK_NO_HISPD_BIT,
 	.quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN,
 	.ops = &sdhci_iproc_ops,
 };