[3.16.y-ckt stable] Patch "mmc: sdhci-pxav3: Fix Armada 38x controller's caps according to erratum ERR-7878951" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    mmc: sdhci-pxav3: Fix Armada 38x controller's caps according to erratum ERR-7878951

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt8.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From a66664cc85178fb639fdf786154d196e928d99e2 Mon Sep 17 00:00:00 2001
From: Marcin Wojtas <mw at semihalf.com>
Date: Thu, 29 Jan 2015 12:36:25 +0100
Subject: mmc: sdhci-pxav3: Fix Armada 38x controller's caps according to
 erratum ERR-7878951

commit a39128bcd6f1e56c6514abf489b40b67d226093b upstream.

According to erratum 'ERR-7878951' Armada 38x SDHCI controller has
different capabilities than the ones shown in its registers:

- it doesn't support the voltage switching: it can work either with
  3.3V or 1.8V supply
- it doesn't support the SDR104 mode
- SDR50 mode doesn't need tuning

The SDHCI_QUIRK_MISSING_CAPS quirk is used for updating the
capabilities accordingly.

[gregory.clement at free-electrons.com: port from 3.10]

Fixes: 5491ce3f79ee ("mmc: sdhci-pxav3: add support for the Armada 38x SDHCI controller")

Signed-off-by: Gregory CLEMENT <gregory.clement at free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson at linaro.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/mmc/host/sdhci-pxav3.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
index f6a5aaf7c918..3ceadd11f641 100644
--- a/drivers/mmc/host/sdhci-pxav3.c
+++ b/drivers/mmc/host/sdhci-pxav3.c
@@ -112,8 +112,11 @@ static int mv_conf_mbus_windows(struct platform_device *pdev,
 	return 0;
 }

-static int armada_38x_quirks(struct sdhci_host *host)
+static int armada_38x_quirks(struct platform_device *pdev,
+			     struct sdhci_host *host)
 {
+	struct device_node *np = pdev->dev.of_node;
+
 	host->quirks |= SDHCI_QUIRK_MISSING_CAPS;
 	/*
 	 * According to erratum 'FE-2946959' both SDR50 and DDR50
@@ -123,6 +126,21 @@ static int armada_38x_quirks(struct sdhci_host *host)
 	 */
 	host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
 	host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50);
+
+	/*
+	 * According to erratum 'ERR-7878951' Armada 38x SDHCI
+	 * controller has different capabilities than the ones shown
+	 * in its registers
+	 */
+	host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+	if (of_property_read_bool(np, "no-1-8-v")) {
+		host->caps &= ~SDHCI_CAN_VDD_180;
+		host->mmc->caps &= ~MMC_CAP_1_8V_DDR;
+	} else {
+		host->caps &= ~SDHCI_CAN_VDD_330;
+	}
+	host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_USE_SDR50_TUNING);
+
 	return 0;
 }

@@ -323,8 +341,11 @@ static int sdhci_pxav3_probe(struct platform_device *pdev)
 	pltfm_host->clk = clk;
 	clk_prepare_enable(clk);

+	/* enable 1/8V DDR capable */
+	host->mmc->caps |= MMC_CAP_1_8V_DDR;
+
 	if (of_device_is_compatible(np, "marvell,armada-380-sdhci")) {
-		ret = armada_38x_quirks(host);
+		ret = armada_38x_quirks(pdev, host);
 		if (ret < 0)
 			goto err_clk_get;
 		ret = mv_conf_mbus_windows(pdev, mv_mbus_dram_info());
@@ -332,9 +353,6 @@ static int sdhci_pxav3_probe(struct platform_device *pdev)
 			goto err_mbus_win;
 	}

-	/* enable 1/8V DDR capable */
-	host->mmc->caps |= MMC_CAP_1_8V_DDR;
-
 	match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev);
 	if (match) {
 		ret = mmc_of_parse(host->mmc);