Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux

mmc: sdhci-pci-gli: Fine tune GL9763E L1 entry delay

Fine tune the value to 21us in order to improve read/write performance.

Signed-off-by: Ben Chuang <benchuanggli@gmail.com>
Link: https://lore.kernel.org/r/20210511061835.5559-1-benchuanggli@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

authored by

Ben Chuang and committed by
Ulf Hansson
34dd3ccc 110a8688

+2 -2
+2 -2
drivers/mmc/host/sdhci-pci-gli.c
··· 94 94 95 95 #define PCIE_GLI_9763E_CFG2 0x8A4 96 96 #define GLI_9763E_CFG2_L1DLY GENMASK(28, 19) 97 - #define GLI_9763E_CFG2_L1DLY_MID 0x50 97 + #define GLI_9763E_CFG2_L1DLY_MID 0x54 98 98 99 99 #define PCIE_GLI_9763E_MMC_CTRL 0x960 100 100 #define GLI_9763E_HS400_SLOW BIT(3) ··· 847 847 848 848 pci_read_config_dword(pdev, PCIE_GLI_9763E_CFG2, &value); 849 849 value &= ~GLI_9763E_CFG2_L1DLY; 850 - /* set ASPM L1 entry delay to 20us */ 850 + /* set ASPM L1 entry delay to 21us */ 851 851 value |= FIELD_PREP(GLI_9763E_CFG2_L1DLY, GLI_9763E_CFG2_L1DLY_MID); 852 852 pci_write_config_dword(pdev, PCIE_GLI_9763E_CFG2, value); 853 853