linux-kernel - [PATCH] mmc: sdhci-pci-gli: Enlarge ASPM L1 entry delay of GL975x

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Date:   Thu, 15 Apr 2021 11:26:37 +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,
        SeanHY.Chen@...esyslogic.com.tw, Renius.Chen@...esyslogic.com.tw,
        ben.chuang@...esyslogic.com.tw, greg.tu@...esyslogic.com.tw,
        Ben Chuang <benchuanggli@...il.com>
Subject: [PATCH] mmc: sdhci-pci-gli: Enlarge ASPM L1 entry delay of GL975x

GL975x enters ASPM L1 state after a short idle in default.
Enlarge the idle period to 7.9us for improving the R/W performance.

Signed-off-by: Ben Chuang <benchuanggli@...il.com>
---
 drivers/mmc/host/sdhci-pci-gli.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index eb1ebb67e113..592d79082f58 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -22,6 +22,10 @@
 #define   GLI_9750_WT_EN_ON	    0x1
 #define   GLI_9750_WT_EN_OFF	    0x0
 
+#define SDHCI_GLI_9750_CFG2          0x848
+#define   SDHCI_GLI_9750_CFG2_L1DLY    GENMASK(28, 24)
+#define   GLI_9750_CFG2_L1DLY_VALUE    0x1F
+
 #define SDHCI_GLI_9750_DRIVING      0x860
 #define   SDHCI_GLI_9750_DRIVING_1    GENMASK(11, 0)
 #define   SDHCI_GLI_9750_DRIVING_2    GENMASK(27, 26)
@@ -113,6 +117,10 @@
 #define   PCI_GLI_9755_LFCLK    GENMASK(14, 12)
 #define   PCI_GLI_9755_DMACLK   BIT(29)
 
+#define PCI_GLI_9755_CFG2          0x48
+#define   PCI_GLI_9755_CFG2_L1DLY    GENMASK(28, 24)
+#define   GLI_9755_CFG2_L1DLY_VALUE  0x1F
+
 #define PCI_GLI_9755_PLL            0x64
 #define   PCI_GLI_9755_PLL_LDIV       GENMASK(9, 0)
 #define   PCI_GLI_9755_PLL_PDIV       GENMASK(14, 12)
@@ -408,6 +416,22 @@ static void sdhci_gl9750_set_clock(struct sdhci_host *host, unsigned int clock)
 	sdhci_enable_clk(host, clk);
 }
 
+static void gl9750_hw_setting(struct sdhci_host *host)
+{
+	u32 value;
+
+	gl9750_wt_on(host);
+
+	value = sdhci_readl(host, SDHCI_GLI_9750_CFG2);
+	value &= ~SDHCI_GLI_9750_CFG2_L1DLY;
+	/* set ASPM L1 entry delay to 7.9us */
+	value |= FIELD_PREP(SDHCI_GLI_9750_CFG2_L1DLY,
+			    GLI_9750_CFG2_L1DLY_VALUE);
+	sdhci_writel(host, value, SDHCI_GLI_9750_CFG2);
+
+	gl9750_wt_off(host);
+}
+
 static void gli_pcie_enable_msi(struct sdhci_pci_slot *slot)
 {
 	int ret;
@@ -555,6 +579,13 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
 	value &= ~PCI_GLI_9755_SCP_DIS;
 	pci_write_config_dword(pdev, PCI_GLI_9755_SerDes, value);
 
+	pci_read_config_dword(pdev, PCI_GLI_9755_CFG2, &value);
+	value &= ~PCI_GLI_9755_CFG2_L1DLY;
+	/* set ASPM L1 entry delay to 7.9us */
+	value |= FIELD_PREP(PCI_GLI_9755_CFG2_L1DLY,
+			    GLI_9755_CFG2_L1DLY_VALUE);
+	pci_write_config_dword(pdev, PCI_GLI_9755_CFG2, value);
+
 	gl9755_wt_off(pdev);
 }
 
@@ -562,6 +593,7 @@ static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
 {
 	struct sdhci_host *host = slot->host;
 
+	gl9750_hw_setting(host);
 	gli_pcie_enable_msi(slot);
 	slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
 	sdhci_enable_v4_mode(host);
-- 
2.30.0