linux-kernel - [PATCH] mmc: sdhci-pci-gli: Disable slow mode in HS400 mode for GL9763E

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Date:   Wed, 25 Nov 2020 18:00:04 +0800
From:   Ben Chuang <benchuanggli@...il.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ben.chuang@...esyslogic.com.tw, Ben Chuang <benchuanggli@...il.com>
Subject: [PATCH] mmc: sdhci-pci-gli: Disable slow mode in HS400 mode for GL9763E

From: Ben Chuang <ben.chuang@...esyslogic.com.tw>

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.

Fixes: 1ae1d2d6e555 ("mmc: sdhci-pci-gli: Add Genesys Logic GL9763E support")
Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
---
 drivers/mmc/host/sdhci-pci-gli.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 9887485a4134..d45d7e529150 100644
--- 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 | \
@@ -764,6 +767,10 @@ 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);
-- 
2.29.2