linux-kernel - [PATCH v2 2/2] mmc: sdhci-iproc: Set NO_HISPD bit to fix HS50 data hold time problem

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Date:   Wed,  8 May 2019 09:40:44 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Trac Hoang <trac.hoang@...adcom.com>,
        stable@...r.kernel.org, Scott Branden <scott.branden@...adcom.com>
Subject: [PATCH v2 2/2] mmc: sdhci-iproc: Set NO_HISPD bit to fix HS50 data hold time problem

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

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.

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

diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
index 9d4071c41c94..2feb4ef32035 100644
--- a/drivers/mmc/host/sdhci-iproc.c
+++ b/drivers/mmc/host/sdhci-iproc.c
@@ -220,7 +220,8 @@ static const struct sdhci_iproc_data iproc_cygnus_data = {
 
 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,
 };
-- 
2.17.1