mmc: sdhci: add support for realtek rts5250

Add support for realtek rts5250 pci card reader. The card reader has
some problems with DDR50 mode, so add a new quirks2 for broken ddr50.

Signed-off-by: Micky Ching <micky_ching@realsil.com.cn>
Signed-off-by: Chris Ball <chris@printf.net>

3 files changed, 24 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index 0955777b6c7e..fdc612120362 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -610,6 +610,18 @@ static const struct sdhci_pci_fixes sdhci_via = {
         .probe          = via_probe,
 };
 
+static int rtsx_probe_slot(struct sdhci_pci_slot *slot)
+{
+        slot->host->mmc->caps2 |= MMC_CAP2_HS200;
+        return 0;
+}
+
+static const struct sdhci_pci_fixes sdhci_rtsx = {
+        .quirks2        = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+                        SDHCI_QUIRK2_BROKEN_DDR50,
+        .probe_slot     = rtsx_probe_slot,
+};
+
 static const struct pci_device_id pci_ids[] = {
         {
                 .vendor         = PCI_VENDOR_ID_RICOH,
@@ -732,6 +744,14 @@ static const struct pci_device_id pci_ids[] = {
         },
 
         {
+                .vendor         = PCI_VENDOR_ID_REALTEK,
+                .device         = 0x5250,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .driver_data    = (kernel_ulong_t)&sdhci_rtsx,
+        },
+
+        {
                 .vendor         = PCI_VENDOR_ID_INTEL,
                 .device         = PCI_DEVICE_ID_INTEL_MRST_SD0,
                 .subvendor      = PCI_ANY_ID,
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9ddef4763541..8958edc03e04 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3020,7 +3020,8 @@ int sdhci_add_host(struct sdhci_host *host)
         } else if (caps[1] & SDHCI_SUPPORT_SDR50)
                 mmc->caps |= MMC_CAP_UHS_SDR50;
 
-        if (caps[1] & SDHCI_SUPPORT_DDR50)
+        if ((caps[1] & SDHCI_SUPPORT_DDR50) &&
+                !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
                 mmc->caps |= MMC_CAP_UHS_DDR50;
 
         /* Does the host need tuning for SDR50? */
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 362927c48f97..7be12b883485 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -100,6 +100,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK2_BROKEN_HOST_CONTROL                (1<<5)
 /* Controller does not support HS200 */
 #define SDHCI_QUIRK2_BROKEN_HS200                       (1<<6)
+/* Controller does not support DDR50 */
+#define SDHCI_QUIRK2_BROKEN_DDR50                       (1<<7)
 
         int irq;                /* Device IRQ */
         void __iomem *ioaddr;   /* Mapped address */