linux-kernel - [PATCH 3.16.y-ckt 117/118] mmc: sdhci: Fix FSL ESDHC reset handling quirk

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Date:	Wed, 12 Aug 2015 09:56:59 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alessio Igor Bogani <alessio.bogani@...ttra.eu>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Jakub Kicinski <kubakici@...pl>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 117/118] mmc: sdhci: Fix FSL ESDHC reset handling quirk

3.16.7-ckt16 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alessio Igor Bogani <alessio.bogani@...ttra.eu>

commit 304f0a98d168563b5f69c53a7544c36e6d221ac4 upstream.

The commit 0718e59ae259 ("mmc: sdhci: move FSL ESDHC reset handling quirk into
esdhc code") states that Freescale esdhc is the only controller which needs
the interrupt registers restored after a reset. So it moves
SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET quirk handling code into the
esdhc-imx driver only. Unfortunately the same controller is used in
other boards which use the of-esdhc driver instead (like powerpc P2020).

Restore interrupts after reset in the sdhci-of-esdhc driver also.

Signed-off-by: Alessio Igor Bogani <alessio.bogani@...ttra.eu>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Jakub Kicinski <kubakici@...pl>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/mmc/host/sdhci-of-esdhc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 8be4dcfb49a0..fdc27327aece 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -276,6 +276,14 @@ static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
 			ESDHC_CTRL_BUSWIDTH_MASK, ctrl);
 }
 
+static void esdhc_reset(struct sdhci_host *host, u8 mask)
+{
+	sdhci_reset(host, mask);
+
+	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+}
+
 static const struct sdhci_ops sdhci_esdhc_ops = {
 	.read_l = esdhc_readl,
 	.read_w = esdhc_readw,
@@ -290,7 +298,7 @@ static const struct sdhci_ops sdhci_esdhc_ops = {
 	.platform_init = esdhc_of_platform_init,
 	.adma_workaround = esdhci_of_adma_workaround,
 	.set_bus_width = esdhc_pltfm_set_bus_width,
-	.reset = sdhci_reset,
+	.reset = esdhc_reset,
 	.set_uhs_signaling = sdhci_set_uhs_signaling,
 };
 
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