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authorRussell King <rmk+kernel@arm.linux.org.uk>2016-01-26 13:40:47 +0000
committerUlf Hansson <ulf.hansson@linaro.org>2016-02-29 11:03:16 +0100
commit0ca33b4ad9cfc133bb3d93eec1ad0eea83d6f252 (patch)
tree195f7f5442ccf5cd9b2e4eb0591ac211d6e30b04 /drivers/mmc/host/sdhci-pxav3.c
parent054cedff5e025a54ceefff891c6ea42ee8b37eab (diff)
mmc: sdhci-pxav3: fix higher speed mode capabilities
Commit 1140011ee9d9 ("mmc: sdhci-pxav3: Modify clock settings for the SDR50 and DDR50 modes") broke any chance of the SDR50 or DDR50 modes being used. The commit claims that SDR50 and DDR50 require clock adjustments in the SDIO3 Configuration register, which is located via the "conf-sdio3" resource. However, when this resource is given, we fail to read the host capabilities 1 register, resulting in host->caps1 being zero. Hence, both SDHCI_SUPPORT_SDR50 and SDHCI_SUPPORT_DDR50 bits remain zero, disabling the SDR50 and DDR50 modes. The underlying idea in this function appears to be to read the device capabilities, modify them, and set SDHCI_QUIRK_MISSING_CAPS to cause our modified capabilities to be used. Implement exactly that. Fixes: 1140011ee9d9 ("mmc: sdhci-pxav3: Modify clock settings for the SDR50 and DDR50 modes") Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: stable@vger.kernel.org # v4.5+ Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sdhci-pxav3.c')
-rw-r--r--drivers/mmc/host/sdhci-pxav3.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
index f5edf9d3a18a..c7f27fe4805a 100644
--- a/drivers/mmc/host/sdhci-pxav3.c
+++ b/drivers/mmc/host/sdhci-pxav3.c
@@ -137,6 +137,10 @@ static int armada_38x_quirks(struct platform_device *pdev,
host->quirks &= ~SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
host->quirks |= SDHCI_QUIRK_MISSING_CAPS;
+
+ host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+ host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
+
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"conf-sdio3");
if (res) {
@@ -150,7 +154,6 @@ static int armada_38x_quirks(struct platform_device *pdev,
* Configuration register, if the adjustment is not done,
* remove them from the capabilities.
*/
- host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50);
dev_warn(&pdev->dev, "conf-sdio3 register not found: disabling SDR50 and DDR50 modes.\nConsider updating your dtb\n");
@@ -161,7 +164,6 @@ static int armada_38x_quirks(struct platform_device *pdev,
* 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;