From: Shawn Lin <shawn.lin@rock-chips.com>
Date: Tue, 4 Nov 2025 08:41:53 +0000 (+0800)
Subject: mmc: core: Allow more host caps to be modified through debugfs
X-Git-Tag: v6.19-rc1~144^2~22
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f87aaf5b62e30539dae41371f15730db549bc9b;p=thirdparty%2Fkernel%2Flinux.git

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

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>
---

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index f10a4dcf1f951..91ea00a0f61df 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -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;