[PATCH 3/3] ARM: dts: ux500: Skomer eMMC needs 300 ms power on
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From: Linus Walleij <hidden>
Date: 2021-09-21 14:00:45
Subsystem:
the rest · Maintainer:
Linus Torvalds
The partitions on the eMMC will not even appear sometimes, in the datasheet for the Samsung KLMxGxxE4x we find that the power-on time for a 4GB eMMC of this type is 300 ms and nowadays the block stack is so fast so we are stressing it, and we need to specify that we need this delay in the device tree. Signed-off-by: Linus Walleij <redacted> --- arch/arm/boot/dts/ste-ux500-samsung-skomer.dts | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/ste-ux500-samsung-skomer.dts b/arch/arm/boot/dts/ste-ux500-samsung-skomer.dts
index fe09e8ab24da..011c11ad0d70 100644
--- a/arch/arm/boot/dts/ste-ux500-samsung-skomer.dts
+++ b/arch/arm/boot/dts/ste-ux500-samsung-skomer.dts@@ -240,7 +240,9 @@ wifi@1 { }; }; - // eMMC + /* + * eMMC seems to be mostly Samsung KLM4G1YE4C "4YMD1R" + */ mmc@80005000 { arm,primecell-periphid = <0x10480180>; max-frequency = <100000000>;
@@ -250,6 +252,8 @@ mmc@80005000 { mmc-ddr-1_8v; no-sdio; no-sd; + /* From datasheet page 26 figure 9: 300 ms set-up time for 4GB */ + post-power-on-delay-ms = <300>; vmmc-supply = <&ldo_3v3_reg>; pinctrl-names = "default", "sleep"; pinctrl-0 = <&mc2_a_1_default>;
--
2.31.1
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