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authorTom Warren <twarren@nvidia.com>2019-06-03 16:06:34 -0700
committerTom Warren <twarren@nvidia.com>2020-04-02 14:30:01 -0700
commita482f32992230d8bdae2caa72056ab7d9208d5f0 (patch)
tree02b8009a11d357044536905c5eeb79e8d1ceba3e /arch/arm/include
parent5e965e814067e7539943bbaeb47d7bf9738a701b (diff)
mmc: t210: Fix 'bad' SD-card clock when doing 400KHz card detect
According to the HW team, for some reason the normal clock select code picks what appears to be a perfectly valid 375KHz SD card clock, based on the CAR clock source and SDMMC1 controller register settings (CAR = 408MHz PLLP0 divided by 68 for 6MHz, then a SD Clock Control register divisor of 16 = 375KHz). But the resulting SD card clock, as measured by the HW team, is 700KHz, which is out-of-spec. So the WAR is to use the values given in the TRM PLLP table to generate a 400KHz SD-clock (CAR clock of 24.7MHz, SD Clock Control divisor of 62) only for SDMMC1 on T210 when the requested clock is <= 400KHz. Note that as far as I can tell, the other requests for clocks in the Tegra MMC driver result in valid SD clocks. Signed-off-by: Tom Warren <twarren@nvidia.com> Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/arch-tegra/tegra_mmc.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/include/asm/arch-tegra/tegra_mmc.h b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
index a8bfa466c0..70dcf4aa66 100644
--- a/arch/arm/include/asm/arch-tegra/tegra_mmc.h
+++ b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
@@ -130,9 +130,9 @@ struct tegra_mmc {
/* SDMMC1/3 settings from SDMMCx Initialization Sequence of TRM */
#define MEMCOMP_PADCTRL_VREF 7
#define AUTO_CAL_ENABLE (1 << 29)
-#if defined(CONFIG_TEGRA210)
#define AUTO_CAL_ACTIVE (1 << 31)
#define AUTO_CAL_START (1 << 31)
+#if defined(CONFIG_TEGRA210)
#define AUTO_CAL_PD_OFFSET (0x7D << 8)
#define AUTO_CAL_PU_OFFSET (0 << 0)
#define IO_TRIM_BYPASS_MASK (1 << 2)