diff options
Diffstat (limited to 'target/linux/rockchip/patches-6.6/001-v6.3-mmc-sdhci-of-dwcmshc-Update-DLL-and-pre-change-delay-for.patch')
| -rw-r--r-- | target/linux/rockchip/patches-6.6/001-v6.3-mmc-sdhci-of-dwcmshc-Update-DLL-and-pre-change-delay-for.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/target/linux/rockchip/patches-6.6/001-v6.3-mmc-sdhci-of-dwcmshc-Update-DLL-and-pre-change-delay-for.patch b/target/linux/rockchip/patches-6.6/001-v6.3-mmc-sdhci-of-dwcmshc-Update-DLL-and-pre-change-delay-for.patch new file mode 100644 index 0000000000..2bb542be36 --- /dev/null +++ b/target/linux/rockchip/patches-6.6/001-v6.3-mmc-sdhci-of-dwcmshc-Update-DLL-and-pre-change-delay-for.patch @@ -0,0 +1,60 @@ +From b75a52b0dda353aeefb4830a320589a363f49579 Mon Sep 17 00:00:00 2001 +From: Shawn Lin <shawn.lin@rock-chips.com> +Date: Thu, 2 Feb 2023 08:35:16 +0800 +Subject: [PATCH] mmc: sdhci-of-dwcmshc: Update DLL and pre-change delay for + rockchip platform + +For Rockchip platform, DLL bypass bit and start bit need to be set if +DLL is not locked. And adjust pre-change delay to 0x3 for better signal +test result. + +Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> +Link: https://lore.kernel.org/r/1675298118-64243-2-git-send-email-shawn.lin@rock-chips.com +Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> +--- + drivers/mmc/host/sdhci-of-dwcmshc.c | 13 +++++++++---- + 1 file changed, 9 insertions(+), 4 deletions(-) + +--- a/drivers/mmc/host/sdhci-of-dwcmshc.c ++++ b/drivers/mmc/host/sdhci-of-dwcmshc.c +@@ -48,6 +48,7 @@ + #define DWCMSHC_EMMC_DLL_RXCLK_SRCSEL 29 + #define DWCMSHC_EMMC_DLL_START_POINT 16 + #define DWCMSHC_EMMC_DLL_INC 8 ++#define DWCMSHC_EMMC_DLL_BYPASS BIT(24) + #define DWCMSHC_EMMC_DLL_DLYENA BIT(27) + #define DLL_TXCLK_TAPNUM_DEFAULT 0x10 + #define DLL_TXCLK_TAPNUM_90_DEGREES 0xA +@@ -60,6 +61,7 @@ + #define DLL_RXCLK_NO_INVERTER 1 + #define DLL_RXCLK_INVERTER 0 + #define DLL_CMDOUT_TAPNUM_90_DEGREES 0x8 ++#define DLL_RXCLK_ORI_GATE BIT(31) + #define DLL_CMDOUT_TAPNUM_FROM_SW BIT(24) + #define DLL_CMDOUT_SRC_CLK_NEG BIT(28) + #define DLL_CMDOUT_EN_SRC_CLK_NEG BIT(29) +@@ -234,9 +236,12 @@ static void dwcmshc_rk3568_set_clock(str + sdhci_writel(host, extra, reg); + + if (clock <= 52000000) { +- /* Disable DLL and reset both of sample and drive clock */ +- sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_CTRL); +- sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_RXCLK); ++ /* ++ * Disable DLL and reset both of sample and drive clock. ++ * The bypass bit and start bit need to be set if DLL is not locked. ++ */ ++ sdhci_writel(host, DWCMSHC_EMMC_DLL_BYPASS | DWCMSHC_EMMC_DLL_START, DWCMSHC_EMMC_DLL_CTRL); ++ sdhci_writel(host, DLL_RXCLK_ORI_GATE, DWCMSHC_EMMC_DLL_RXCLK); + sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_TXCLK); + sdhci_writel(host, 0, DECMSHC_EMMC_DLL_CMDOUT); + /* +@@ -279,7 +284,7 @@ static void dwcmshc_rk3568_set_clock(str + } + + extra = 0x1 << 16 | /* tune clock stop en */ +- 0x2 << 17 | /* pre-change delay */ ++ 0x3 << 17 | /* pre-change delay */ + 0x3 << 19; /* post-change delay */ + sdhci_writel(host, extra, dwc_priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + |