From: Wadim Egorov <w.egorov-guT5V/WYfQezQB+pC5nmwQ@public.gmane.org> To: linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, naobsd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Subject: [PATCH] ARM: dts: rockchip: Bump sd card pin drive strength up on firefly boards Date: Thu, 21 Jan 2016 13:57:13 +0100 [thread overview] Message-ID: <1453381033-3479-1-git-send-email-w.egorov@phytec.de> (raw) It seems some firefly boards need 12mA drive strength for sdmmc. Using 4mA/8mA drive strength will cause the kernel to fail to recognize the sd card correctly. Increased the sdmmc lines drive strength from 4mA to 12mA. Signed-off-by: Wadim Egorov <w.egorov-guT5V/WYfQezQB+pC5nmwQ@public.gmane.org> --- arch/arm/boot/dts/rk3288-firefly.dtsi | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/arm/boot/dts/rk3288-firefly.dtsi b/arch/arm/boot/dts/rk3288-firefly.dtsi index 4e3fd9a..49ec20d 100644 --- a/arch/arm/boot/dts/rk3288-firefly.dtsi +++ b/arch/arm/boot/dts/rk3288-firefly.dtsi @@ -408,6 +408,11 @@ output-low; }; + pcfg_pull_up_drv_12ma: pcfg-pull-up-drv-12ma { + bias-pull-up; + drive-strength = <12>; + }; + act8846 { pwr_hold: pwr-hold { rockchip,pins = <0 1 RK_FUNC_GPIO &pcfg_output_high>; @@ -457,6 +462,25 @@ }; sdmmc { + /* + * Default drive strength isn't enough to achieve even + * high-speed mode on firefly board so bump up to 12ma. + */ + sdmmc_bus4: sdmmc-bus4 { + rockchip,pins = <6 16 RK_FUNC_1 &pcfg_pull_up_drv_12ma>, + <6 17 RK_FUNC_1 &pcfg_pull_up_drv_12ma>, + <6 18 RK_FUNC_1 &pcfg_pull_up_drv_12ma>, + <6 19 RK_FUNC_1 &pcfg_pull_up_drv_12ma>; + }; + + sdmmc_clk: sdmmc-clk { + rockchip,pins = <6 20 RK_FUNC_1 &pcfg_pull_none_12ma>; + }; + + sdmmc_cmd: sdmmc-cmd { + rockchip,pins = <6 21 RK_FUNC_1 &pcfg_pull_up_drv_12ma>; + }; + sdmmc_pwr: sdmmc-pwr { rockchip,pins = <7 11 RK_FUNC_GPIO &pcfg_pull_none>; }; -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: w.egorov@phytec.de (Wadim Egorov) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] ARM: dts: rockchip: Bump sd card pin drive strength up on firefly boards Date: Thu, 21 Jan 2016 13:57:13 +0100 [thread overview] Message-ID: <1453381033-3479-1-git-send-email-w.egorov@phytec.de> (raw) It seems some firefly boards need 12mA drive strength for sdmmc. Using 4mA/8mA drive strength will cause the kernel to fail to recognize the sd card correctly. Increased the sdmmc lines drive strength from 4mA to 12mA. Signed-off-by: Wadim Egorov <w.egorov@phytec.de> --- arch/arm/boot/dts/rk3288-firefly.dtsi | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/arm/boot/dts/rk3288-firefly.dtsi b/arch/arm/boot/dts/rk3288-firefly.dtsi index 4e3fd9a..49ec20d 100644 --- a/arch/arm/boot/dts/rk3288-firefly.dtsi +++ b/arch/arm/boot/dts/rk3288-firefly.dtsi @@ -408,6 +408,11 @@ output-low; }; + pcfg_pull_up_drv_12ma: pcfg-pull-up-drv-12ma { + bias-pull-up; + drive-strength = <12>; + }; + act8846 { pwr_hold: pwr-hold { rockchip,pins = <0 1 RK_FUNC_GPIO &pcfg_output_high>; @@ -457,6 +462,25 @@ }; sdmmc { + /* + * Default drive strength isn't enough to achieve even + * high-speed mode on firefly board so bump up to 12ma. + */ + sdmmc_bus4: sdmmc-bus4 { + rockchip,pins = <6 16 RK_FUNC_1 &pcfg_pull_up_drv_12ma>, + <6 17 RK_FUNC_1 &pcfg_pull_up_drv_12ma>, + <6 18 RK_FUNC_1 &pcfg_pull_up_drv_12ma>, + <6 19 RK_FUNC_1 &pcfg_pull_up_drv_12ma>; + }; + + sdmmc_clk: sdmmc-clk { + rockchip,pins = <6 20 RK_FUNC_1 &pcfg_pull_none_12ma>; + }; + + sdmmc_cmd: sdmmc-cmd { + rockchip,pins = <6 21 RK_FUNC_1 &pcfg_pull_up_drv_12ma>; + }; + sdmmc_pwr: sdmmc-pwr { rockchip,pins = <7 11 RK_FUNC_GPIO &pcfg_pull_none>; }; -- 1.9.1
next reply other threads:[~2016-01-21 12:57 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-01-21 12:57 Wadim Egorov [this message] 2016-01-21 12:57 ` [PATCH] ARM: dts: rockchip: Bump sd card pin drive strength up on firefly boards Wadim Egorov [not found] ` <1453381033-3479-1-git-send-email-w.egorov-guT5V/WYfQezQB+pC5nmwQ@public.gmane.org> 2016-01-22 13:33 ` Heiko Stuebner 2016-01-22 13:33 ` Heiko Stuebner
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