mmc: sdhci-pci-gli: Disable slow mode in HS400 mode for GL9763E

The GL9763E uses 150Mhz (slow mode) by default in HS400 mode. In order
to make HS400 mode run at 200Mhz, the slow mode needs to be turned off.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Link: https://lore.kernel.org/r/20201125110145.2824-1-benchuanggli@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index f10bdfb..b85edd6 100644 (file)
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -87,6 +87,9 @@
 #define PCIE_GLI_9763E_SCR      0x8E0
 #define   GLI_9763E_SCR_AXI_REQ           BIT(9)
 
+#define PCIE_GLI_9763E_MMC_CTRL  0x960
+#define   GLI_9763E_HS400_SLOW     BIT(3)
+
 #define SDHCI_GLI_9763E_CQE_BASE_ADDR   0x200
 #define GLI_9763E_CQE_TRNS_MODE           (SDHCI_TRNS_MULTI | \
                                    SDHCI_TRNS_BLK_CNT_EN | \
@@ -784,6 +787,10 @@ static void gli_set_gl9763e(struct sdhci_pci_slot *slot)
        value |= GLI_9763E_SCR_AXI_REQ;
        pci_write_config_dword(pdev, PCIE_GLI_9763E_SCR, value);
 
+       pci_read_config_dword(pdev, PCIE_GLI_9763E_MMC_CTRL, &value);
+       value &= ~GLI_9763E_HS400_SLOW;
+       pci_write_config_dword(pdev, PCIE_GLI_9763E_MMC_CTRL, value);
+
        pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
        value &= ~GLI_9763E_VHS_REV;
        value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_R);