[PATCH 2/7] mmc: sdhci-pxav3: Fix Armada 38x controller's caps according to erratum ERR-7878951

Gregory CLEMENT
2015-01-21T09:32:01Z

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.

Fixes: 5491ce3f79ee ("mmc: sdhci-pxav3: add support for the Armada 38x SDHCI controller")
Cc: <stable@vger.kernel.org> # v3.15+

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
drivers/mmc/host/sdhci-pxav3.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
index 7b07325b4fba..4daa47a53a62 100644
--- a/drivers/mmc/host/sdhci-pxav3.c
+++ b/drivers/mmc/host/sdhci-pxav3.c
@@ -118,8 +118,11 @@ 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
@@ -129,6 +132,20 @@ 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_get_property(np, "no-1-8-v", NULL)) {
+ 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;
}

@@ -333,7 +350,7 @@ static int sdhci_pxav3_probe(struct platform_device *pdev)
clk_prepare_enable(pxa->clk_core);

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_quirks;
ret = mv_conf_mbus_windows(pdev, mv_mbus_dram_info());
--
1.9.1