From: Vasily Khoruzhick anarsoul@gmail.com
A64 supports automatic delay calibration and Linux driver uses it instead of hardcoded delays. Add support for it to u-boot driver.
Fixes eMMC instability on Pinebook
Signed-off-by: Vasily Khoruzhick anarsoul@gmail.com Signed-off-by: Vagrant Cascadian vagrant@debian.org ---
arch/arm/include/asm/arch-sunxi/mmc.h | 6 +++++- arch/arm/mach-sunxi/Kconfig | 1 + drivers/mmc/Kconfig | 4 ++++ drivers/mmc/sunxi_mmc.c | 20 +++++++++++++++++++- 4 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/arch-sunxi/mmc.h b/arch/arm/include/asm/arch-sunxi/mmc.h index d98c53faaa..f2deafddd2 100644 --- a/arch/arm/include/asm/arch-sunxi/mmc.h +++ b/arch/arm/include/asm/arch-sunxi/mmc.h @@ -46,7 +46,9 @@ struct sunxi_mmc { u32 cbda; /* 0x94 */ u32 res2[26]; #if defined(CONFIG_SUNXI_GEN_SUN6I) || defined(CONFIG_MACH_SUN50I_H6) - u32 res3[64]; + u32 res3[17]; + u32 samp_dl; + u32 res4[46]; #endif u32 fifo; /* 0x100 / 0x200 FIFO access address */ }; @@ -130,5 +132,7 @@ struct sunxi_mmc { #define SUNXI_MMC_COMMON_CLK_GATE (1 << 16) #define SUNXI_MMC_COMMON_RESET (1 << 18)
+#define SUNXI_MMC_CAL_DL_SW_EN (0x1 << 7) + struct mmc *sunxi_mmc_init(int sdc_no); #endif /* _SUNXI_MMC_H */ diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig index 686f38fec4..ae77ee9e8e 100644 --- a/arch/arm/mach-sunxi/Kconfig +++ b/arch/arm/mach-sunxi/Kconfig @@ -271,6 +271,7 @@ config MACH_SUN50I bool "sun50i (Allwinner A64)" select ARM64 select DM_I2C + select MMC_SUNXI_SUPPORTS_CALIBRATION select PHY_SUN4I_USB select SUNXI_DE2 select SUNXI_GEN_SUN6I diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 0a0d4aaf6c..fb8f6697d4 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -569,6 +569,10 @@ config MMC_SUNXI_HAS_NEW_MODE bool depends on MMC_SUNXI
+config MMC_SUNXI_SUPPORTS_CALIBRATION + bool + depends on MMC_SUNXI + config GENERIC_ATMEL_MCI bool "Atmel Multimedia Card Interface support" depends on DM_MMC && BLK && ARCH_AT91 diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c index 39f15eb423..7b064b482c 100644 --- a/drivers/mmc/sunxi_mmc.c +++ b/drivers/mmc/sunxi_mmc.c @@ -99,11 +99,15 @@ static int mmc_set_mod_clk(struct sunxi_mmc_priv *priv, unsigned int hz) { unsigned int pll, pll_hz, div, n, oclk_dly, sclk_dly; bool new_mode = false; + bool calibrate = false; u32 val = 0;
if (IS_ENABLED(CONFIG_MMC_SUNXI_HAS_NEW_MODE) && (priv->mmc_no == 2)) new_mode = true;
+ if (IS_ENABLED(CONFIG_MMC_SUNXI_SUPPORTS_CALIBRATION)) + calibrate = true; + /* * The MMC clock has an extra /2 post-divider when operating in the new * mode. @@ -174,7 +178,11 @@ static int mmc_set_mod_clk(struct sunxi_mmc_priv *priv, unsigned int hz) val = CCM_MMC_CTRL_MODE_SEL_NEW; setbits_le32(&priv->reg->ntsr, SUNXI_MMC_NTSR_MODE_SEL_NEW); #endif - } else { + } else if (!calibrate) { + /* + * Use hardcoded delay values if controller doesn't support + * calibration + */ val = CCM_MMC_CTRL_OCLK_DLY(oclk_dly) | CCM_MMC_CTRL_SCLK_DLY(sclk_dly); } @@ -228,6 +236,16 @@ static int mmc_config_clock(struct sunxi_mmc_priv *priv, struct mmc *mmc) rval &= ~SUNXI_MMC_CLK_DIVIDER_MASK; writel(rval, &priv->reg->clkcr);
+#ifdef CONFIG_MMC_SUNXI_SUPPORTS_CALIBRATION + /* A64 supports calibration of delays on MMC controller and we + * have to set delay of zero before starting calibration. + * Allwinner BSP driver sets a delay only in the case of + * using HS400 which is not supported by mainline U-Boot or + * Linux at the moment + */ + writel(SUNXI_MMC_CAL_DL_SW_EN, &priv->reg->samp_dl); +#endif + /* Re-enable Clock */ rval |= SUNXI_MMC_CLK_ENABLE; writel(rval, &priv->reg->clkcr);