Rockchip SDMMC、SDIO 与 eMMC：DTS、模式切换和兼容性排查完整指南

sdmmc_pwren: sdmmc-pwren {
    rockchip,pins = <1 RK_PB6 1 &pcfg_pull_default>;
};
pinctrl-0 = <&sdmmc_pwr &sdmmc_clk &sdmmc_cmd &sdmmc_bus4>;

sdmmc_pwr: sdmmc-pwr {
    rockchip,pins = <7 11 RK_FUNC_GPIO &pcfg_pull_none>;
};
vcc_sd: sdmmc-regulator {
    compatible = "regulator-fixed";
    gpio = <&gpio7 11 GPIO_ACTIVE_LOW>;
    pinctrl-names = "default";
    pinctrl-0 = <&sdmmc_pwr>;
    regulator-name = "vcc_sd";
    regulator-min-microvolt = <3300000>;
    regulator-max-microvolt = <3300000>;
    startup-delay-us = <100000>;
    vin-supply = <&vcc_io>;
};
&sdmmc {
    vmmc-supply = <&vcc_sd>;
};

sdio_pwrseq:sdio-pwrseq {
        compatible ="mmc-pwrseq-simple";
        clocks = <&rk808 1>;
        clock-names ="ext_clock";
        pinctrl-names ="default";
        pinctrl-0 =<&wifi_enable_h>;
        /*
        * On the module itself this isone of these (depending
        * on the actual cardpopulated):
        * - SDIO_RESET_L_WL_REG_ON
        * - PDN (power down when low)
        */
        reset-gpios = <&gpio0 10GPIO_ACTIVE_LOW>; /* GPIO0_B2 */
};

commit 0c11160a3c03bcf41fd1217d5e44e68ff078c54b
Author: Shawn Lin <shawn.lin@rock-chips.com>
Date: Tue Nov 5 18:05:50 2024 +0800
    mmc: debugfs: Allow more host caps to be moodified
    Change-Id: I2d5df7bc95eaa4a380b5107364aff8df3a759788
commit 478cdcd25cba8be5cfcf56b503b0e070f5aef245
Author: Vincent Whitchurch <vincent.whitchurch@axis.com>
Date: Fri Sep 29 09:45:09 2023 +0200
    UPSTREAM: mmc: debugfs: Allow host caps to be modified
    Change-Id: I6ea2fc093234785e05d05128556c60ef42da02a4
commit a5a3ea5e45d09cff84c04b515b5b71d4dd76524e
Author: Vincent Whitchurch <vincent.whitchurch@axis.com>
Date: Fri Sep 29 09:45:08 2023 +0200
    UPSTREAM: mmc: core: Always reselect card type
    Change-Id: Ie80514ade3b267901818f477d74d91cf7c13e103

[ 5.739929] mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[ 5.941037] mmc_host mmc1: Bus speed (slot 0) = 198000000Hz (slot req 200000000Hz, actual 198000000HZ div = 0)
[ 5.941682] dwmmc_rockchip 2a310000.mmc: Successfully tuned phase to 90
[ 5.941705] mmc1: new ultra high speed SDR104 SDHC card at address aaaa
[ 5.943229] mmcblk1: mmc1:aaaa SC32G 29.7 GiB

root@rk3576-buildroot:/sys/kernel/debug/mmc1# echo 100000000 > clock
[ 86.451685] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 100000000Hz, actual 100000000HZ div = 0)

#在sys/kernel/debug/mmc1目录依次执行下面命令：
echo $(($(cat caps) | (1 << 7))) > caps
echo on > /sys/bus/mmc/devices/mmc1\:aaaa/power/control
echo auto > /sys/bus/mmc/devices/mmc1\:aaaa/power/control
echo $(($(cat caps) & ~(1 << 19))) > caps
echo on > /sys/bus/mmc/devices/mmc1\:aaaa/power/control
#可以看到切换了
[ 78.304578] mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[ 78.501126] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req 50000000Hz, actual 50000000HZ div = 0)
#执行下面命令，确认切换成功了
grep timing ios
timing spec: 2 (sd high-speed) #High speed模式了

#在sys/kernel/debug/mmc1目录依次执行下面命令：
echo $(($(cat caps) | (1 << 7))) > caps
echo on > /sys/bus/mmc/devices/mmc1\:aaaa/power/control
echo auto > /sys/bus/mmc/devices/mmc1\:aaaa/power/control
echo $(($(cat caps) & ~(1 << 2))) > caps
echo on > /sys/bus/mmc/devices/mmc1\:aaaa/power/control
#可以看到切换了
[ 287.590885] mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
[ 287.784531] mmc_host mmc1: Bus speed (slot 0) = 25000000Hz (slot req 25000000Hz, actual 25000000HZ div = 0)
#执行下面命令，确认切换成功了
grep timing ios
timing spec: 0 (legacy) #Defalt speed模式了

[ 2.260445] mmc0: Command Queue Engine enabled
[ 2.260458] mmc0: new HS400 Enhanced strobe MMC card at address 0001
[ 2.260740] mmcblk0: mmc0:0001 BJTD4R 29.1 GiB

#先确认默认频率和模式
root@rk3588-buildroot:/sys/kernel/debug/mmc0# grep clock ios
clock: 200000000 Hz actual clock: 198000000 Hz #默认198MHz
root@rk3588-buildroot:/sys/kernel/debug/mmc0# grep timing ios
timing spec: 10 (mmc HS400 enhanced strobe) #HS400es模式
#开始切换频率
root@rk3588-buildroot:/sys/kernel/debug/mmc0# echo 100000000 > clock
root@rk3588-buildroot:/sys/kernel/debug/mmc0# grep clock ios
clock: 100000000 Hz actual clock: 100000000 Hz #切换成100MHz了
root@rk3588-buildroot:/sys/kernel/debug/mmc0# grep timing ios
timing spec: 10 (mmc HS400 enhanced strobe) #仍然HS400es模式

#在sys/kernel/debug/mmc0目录依次执行下面命令：
echo $(($(cat caps) | (1 << 7))) > caps
echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
echo auto > /sys/bus/mmc/devices/mmc0\:0001/power/control
echo $(($(cat caps2) & ~(1 << 15))) > caps2
echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
#执行下面命令，确认切换成功了
grep timing ios
timing spec: 9 (mmc HS200) #HS200模式了

#在sys/kernel/debug/mmc0目录依次执行下面命令：
echo $(($(cat caps) | (1 << 7))) > caps
echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
echo auto > /sys/bus/mmc/devices/mmc0\:0001/power/control
echo $(($(cat caps) & ~(1 << 1))) > caps
echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
#执行下面命令，确认切换成功了
grep timing ios
timing spec: 1 (mmc high-speed) #High speed模式了

#在sys/kernel/debug/mmc0目录依次执行下面命令：
echo $(($(cat caps) | (1 << 7))) > caps
echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
echo auto > /sys/bus/mmc/devices/mmc0\:0001/power/control
#下面的切换配置按需选择
echo $(($(cat caps) & ~(1 << 6))) > caps #去除8bit支持
echo $(($(cat caps) | (1 << 6))) > caps #添加8bit支持
echo $(($(cat caps) & ~(1 << 0))) > caps #去除4bit支持
echo $(($(cat caps) | (1 << 0))) > caps #添加4bit支持
echo $(($(cat caps) & ~(1 << 30))) > caps #去除cmd23支持
echo $(($(cat caps) | (1 << 30))) > caps #添加cmd23支持
echo $(($(cat caps) & ~(1 << 30))) > caps #去除cmd23支持
echo $(($(cat caps) | (1 << 30))) > caps #添加cmd23支持
echo $(($(cat caps2) & ~(1 << 23))) > caps2 #去除cqe支持
echo $(($(cat caps2) | (1 << 23))) > caps2 #添加cqe支持
echo $(($(cat caps2) & ~(1 << 24))) > caps2 #去除cqe dcmd支持
echo $(($(cat caps2) | (1 << 24))) > caps2 #添加cqe dcmd支持
#再执行这句
echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
#确认ios信息，查看输出结果
cat ios

Device Drivers --->
   <*> MMC/SD/SDIO card support --->
   [*] MMC host test driver

ls /sys/bus/mmc/devices/

mmc1:aaaa

echo 'mmc1:aaaa' > /sys/bus/mmc/drivers/mmcblk/unbind

echo 'mmc1:aaaa' > /sys/bus/mmc/drivers/mmc_test/bind

mmc_test mmc1:aaaa: Card claimed for testing.

cat /sys/kernel/debug/mmc1/mmc1:aaaa/testlist

echo N > /sys/kernel/debug/mmc1/mmc1:aaaa/test

[ 293.194013] mmc1: new high speed SDXC card at address 59b4
[ 293.198185] mmcblk1: mmc1:59b4 00000 59.6 GiB
[ 293.204351] mmcblk1: p1

[ 2229.405694] FAT-fs (mmcblk1p1): bogus number of reserved sectors
[ 2229.405751] FAT-fs (mmcblk1p1): Can't find a valid FAT filesystem

mmc1: new high speed SD card at address b368
mmcblk1: mmc1:b368 SMI 486 MiB
[mmc1] Data transmission error !!!! MINTSTS: [0x00002000]
dwmmc_rockchip ff0c0000.rksdmmc: data FIFO error (status=00002000)
mmcblk1: error -110 sending status command, retrying
need_retune:0,brq->retune_retry_done:0.

&sdmmc {
    card-detect-delay = <1200>;
｝

Workqueue: kmmcd mmc_rescan
[<c0013e24>] (unwind_backtrace+0x0/0xe0) from [<c001172c>] (show_stack+0x10/0x14)
[<c001172c>] (show_stack+0x10/0x14) from [<c04fa444>] (dw_mci_set_ios+0x9c/0x21c)
[<c04fa444>] (dw_mci_set_ios+0x9c/0x21c) from [<c04e7748>] (mmc_set_chip_select+0x18/0x1c)
[<c04e7748>] (mmc_set_chip_select+0x18/0x1c) from [<c04ebd5c>] (mmc_go_idle+0x94/0xc4)
[<c04ebd5c>] (mmc_go_idle+0x94/0xc4) from [<c0748d80>] (mmc_rescan_try_freq+0x54/0xd0)
[<c0748d80>] (mmc_rescan_try_freq+0x54/0xd0) from [<c04e85d0>] (mmc_rescan+0x2c4/0x390)
[<c04e85d0>] (mmc_rescan+0x2c4/0x390) from [<c004d738>] (process_one_work+0x29c/0x458)
[<c004d738>] (process_one_work+0x29c/0x458) from [<c004da88>] (worker_thread+0x194/0x2d4)
[<c004da88>] (worker_thread+0x194/0x2d4) from [<c0052fb4>] (kthread+0xa0/0xac)
[<c0052fb4>] (kthread+0xa0/0xac) from [<c000da98>] (ret_from_fork+0x14/0x3c)
1409..dw_mci_set_ios: wait for unbusy timeout....... STATUS = 0x306 [mmc1]

diff --git a/arch/arm/mach-rockchip/rv1126/rv1126.c b/arch/arm/mach-rockchip/rv1126/rv1126.c
index 311310d3f2..29b694df9c 100644
--- a/arch/arm/mach-rockchip/rv1126/rv1126.c
+++ b/arch/arm/mach-rockchip/rv1126/rv1126.c
@@ -544,6 +544,9 @@ void board_debug_uart_init(void)
 #ifndef CONFIG_TPL_BUILD
 int arch_cpu_init(void)
 {
+ struct rv1126_grf * const grf = (void *)GRF_BASE;
+
+ writel(0x00100000, &grf->iofunc_con3);
        /*
         * CONFIG_DM_RAMDISK: for ramboot that without SPL.
*/

--- a/arch/arm/boot/dts/rv1126-evb-v10.dtsi
+++ b/arch/arm/boot/dts/rv1126-evb-v10.dtsi
    wireless_wlan: wireless-wlan {
@@ -104,9 +99,14 @@ sdmmc_pwren: sdmmc-pwren {
            rockchip,pins = <0 RK_PA1 RK_FUNC_GPIO &pcfg_pull_none>;
        };
+ sdmmc0_idle_pins: sdmmc-idle-pins {
+ rockchip,pins =
+ <3 RK_PA2 RK_FUNC_GPIO &pcfg_pull_down>,
+ <3 RK_PA3 RK_FUNC_GPIO &pcfg_pull_down>,
+ <3 RK_PA4 RK_FUNC_GPIO &pcfg_pull_down>,
+ <3 RK_PA5 RK_FUNC_GPIO &pcfg_pull_down>,
+ <3 RK_PA6 RK_FUNC_GPIO &pcfg_pull_down>,
+ <3 RK_PA7 RK_FUNC_GPIO &pcfg_pull_down>;
+ };
    };
@@ -140,21 +140,18 @@ &sdio {
 };
 &sdmmc {
    max-frequency = <200000000>;
    no-sdio;
    no-mmc;
    bus-width = <4>;
    cap-mmc-highspeed;
    cap-sd-highspeed;
    disable-wp;
- pinctrl-names = "default";
+ pinctrl-names = "normal", "idle";
    pinctrl-0 = <&sdmmc0_clk &sdmmc0_cmd &sdmmc0_det &sdmmc0_bus4>;
+ pinctrl-1 = <&sdmmc0_idle_gpios &sdmmc0_det>;
    vmmc-supply = <&vcc3v3_sd>;
    vqmmc-supply = <&vccio_sd>;
    status = "okay";
 };