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@xxxxxxxxx>
---
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
