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mmc: core: Allow more host caps to be modified through debugfs

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This makes various signal and function tests more convenient
without the need to modify the DTB.

/sys/kernel/debug/mmc0# echo $(($(cat caps) | (1 << 7))) > caps
/sys/kernel/debug/mmc0# echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
/sys/kernel/debug/mmc0# echo auto > /sys/bus/mmc/devices/mmc0\:0001/power/control

// Disable 8-bit support
echo $(($(cat caps) & ~(1 << 6))) > caps
// Enable 8-bit support
echo $(($(cat caps) | (1 << 6))) > caps
// Disable 4-bit support
echo $(($(cat caps) & ~(1 << 0))) > caps
// Enable 4-bit support
echo $(($(cat caps) | (1 << 0))) > caps
// Disable CMD23 support
echo $(($(cat caps) & ~(1 << 30))) > caps
// Enable CMD23 support
echo $(($(cat caps) | (1 << 30))) > caps
// Disable CMD23 support
echo $(($(cat caps) & ~(1 << 30))) > caps
// Enable CMD23 support
echo $(($(cat caps) | (1 << 30))) > caps
// Disable CQE support
echo $(($(cat caps2) & ~(1 << 23))) > caps2
// Enable CQE support
echo $(($(cat caps2) | (1 << 23))) > caps2
// Disable CQE DCMD support
echo $(($(cat caps2) & ~(1 << 24))) > caps2
// Enable CQE DCMD support
echo $(($(cat caps2) | (1 << 24))) > caps2

/sys/kernel/debug/mmc0# echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control
/sys/kernel/debug/mmc0# cat ios

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2025-11-04 16:41:53 +08:00 committed by Ulf Hansson
parent fda1e0af7c
commit 5f87aaf5b6
1 changed files with 8 additions and 2 deletions
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10
drivers/mmc/core/debugfs.c
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@ -315,7 +315,10 @@ static int mmc_caps_set(void *data, u64 val)
MMC_CAP_SD_HIGHSPEED |
MMC_CAP_MMC_HIGHSPEED |
MMC_CAP_UHS |
MMC_CAP_DDR;
MMC_CAP_DDR |
MMC_CAP_4_BIT_DATA |
MMC_CAP_8_BIT_DATA |
MMC_CAP_CMD23;
if (diff & ~allowed)
return -EINVAL;
@ -327,7 +330,10 @@ static int mmc_caps_set(void *data, u64 val)
static int mmc_caps2_set(void *data, u64 val)
{
u32 allowed = MMC_CAP2_HSX00_1_8V | MMC_CAP2_HSX00_1_2V;
u32 allowed = MMC_CAP2_HSX00_1_8V |
MMC_CAP2_HSX00_1_2V |
MMC_CAP2_CQE |
MMC_CAP2_CQE_DCMD;
u32 *caps = data;
u32 diff = *caps ^ val;