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 <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/core/debugfs.c

···
 		      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;
···
 
 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;