mmc: sdhci-pci: add 8-bit bus width support for mrst hc0

And hook platform_8bit_width to support 8-bit bus width.

Signed-off-by: Major Lee <major_lee@wistron.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index 936bbca19c0a47b13066b935221f2b583c574a3c..e1ae855960b9c97259861fd594afc39e22cefa3b 100644 (file)
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -143,6 +143,12 @@ static const struct sdhci_pci_fixes sdhci_cafe = {
                          SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
 };
 
+static int mrst_hc_probe_slot(struct sdhci_pci_slot *slot)
+{
+       slot->host->mmc->caps |= MMC_CAP_8_BIT_DATA;
+       return 0;
+}
+
 /*
  * ADMA operation is disabled for Moorestown platform due to
  * hardware bugs.
@@ -159,6 +165,7 @@ static int mrst_hc_probe(struct sdhci_pci_chip *chip)
 
 static const struct sdhci_pci_fixes sdhci_intel_mrst_hc0 = {
        .quirks         = SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_NO_HISPD_BIT,
+       .probe_slot     = mrst_hc_probe_slot,
 };
 
 static const struct sdhci_pci_fixes sdhci_intel_mrst_hc1_hc2 = {
@@ -789,8 +796,34 @@ static int sdhci_pci_enable_dma(struct sdhci_host *host)
        return 0;
 }
 
+static int sdhci_pci_8bit_width(struct sdhci_host *host, int width)
+{
+       u8 ctrl;
+
+       ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+
+       switch (width) {
+       case MMC_BUS_WIDTH_8:
+               ctrl |= SDHCI_CTRL_8BITBUS;
+               ctrl &= ~SDHCI_CTRL_4BITBUS;
+               break;
+       case MMC_BUS_WIDTH_4:
+               ctrl |= SDHCI_CTRL_4BITBUS;
+               ctrl &= ~SDHCI_CTRL_8BITBUS;
+               break;
+       default:
+               ctrl &= ~(SDHCI_CTRL_8BITBUS | SDHCI_CTRL_4BITBUS);
+               break;
+       }
+
+       sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+
+       return 0;
+}
+
 static struct sdhci_ops sdhci_pci_ops = {
        .enable_dma     = sdhci_pci_enable_dma,
+       .platform_8bit_width    = sdhci_pci_8bit_width,
 };
 
 /*****************************************************************************\