kernel/linux.git/drivers/mmc/core/debugfs.c, branch v6.19.11

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

2025-11-11T16:59:17+00:00

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 Signed-off-by: Ulf Hansson

mmc: debugfs: add card entry for quirks

2024-04-02T10:25:08+00:00

This is useful to check if a quirk has been applied for the connected mmc card. Signed-off-by: Rouven Czerwinski Link: https://lore.kernel.org/r/20240326094215.212930-2-r.czerwinski@pengutronix.de Signed-off-by: Ulf Hansson

mmc: debugfs: convert permissions to octal

2024-04-02T10:25:08+00:00

Convert the existing symbolic permissions to the octal presentation as this is the preferred representation for debugfs permissions. Signed-off-by: Rouven Czerwinski Link: https://lore.kernel.org/r/20240326094215.212930-1-r.czerwinski@pengutronix.de Signed-off-by: Ulf Hansson

mmc: debugfs: Allow host caps to be modified

2023-10-10T11:44:49+00:00

During board verification, there is a need to test the various supported eMMC/SD speed modes. However, since the framework chooses the best mode supported by the card and the host controller's caps, this currently necessitates changing the devicetree for every iteration. Allow the various speed mode host capabilities to be modified via debugfs in order to allow easier hardware verification. The values to be written are the raw MMC_CAP* values from include/linux/mmc/host.h. This is rather low-level, and these defines are not guaranteed to be stable, but it is perhaps good enough for the intended use case. MMC_CAP_AGGRESSIVE_PM can also be set, in order to be able to re-initialize the card without having to physically remove and re-insert it. /sys/kernel/debug/mmc0# grep timing ios timing spec: 9 (mmc HS200) // Turn on MMC_CAP_AGGRESSIVE_PM and re-trigger runtime suspend /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 // MMC_CAP2_HS200_1_8V_SDR /sys/kernel/debug/mmc0# echo $(($(cat caps2) & ~(1 << 5))) > caps2 /sys/kernel/debug/mmc0# echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control /sys/kernel/debug/mmc0# grep timing ios timing spec: 8 (mmc DDR52) Signed-off-by: Vincent Whitchurch Link: https://lore.kernel.org/r/20230929-mmc-caps-v2-2-11a4c2d94f15@axis.com Signed-off-by: Ulf Hansson

mmc: core: remove unnecessary (void*) conversions

2023-04-03T12:36:12+00:00

Pointer variables of void * type do not require type cast. Signed-off-by: Yu Zhe Link: https://lore.kernel.org/r/20230328031049.22749-1-yuzhe@nfschina.com Signed-off-by: Ulf Hansson

mmc: debugfs: Fix file release memory leak

2022-07-12T10:25:36+00:00

When using single_open() for opening, single_release() should be used instead of seq_release(), otherwise there is a memory leak. Reported-by: Hulk Robot Signed-off-by: Wei Yongjun Acked-by: Adrian Hunter Link: https://lore.kernel.org/r/20220608090152.179395-1-weiyongjun1@huawei.com Signed-off-by: Ulf Hansson

mmc: debugfs: Add debug fs error state entry for mmc driver

2022-07-12T10:25:35+00:00

Add debug fs entry error state to query eMMC and SD card errors statistics. If any errors occurred in eMMC and SD card driver level then err_state value will be set to 1. Signed-off-by: Liangliang Lu Signed-off-by: Sayali Lokhande Signed-off-by: Bao D. Nguyen Signed-off-by: Shaik Sajida Bhanu Acked-by: Adrian Hunter Link: https://lore.kernel.org/r/1653674036-21829-5-git-send-email-quic_c_sbhanu@quicinc.com Signed-off-by: Ulf Hansson

mmc: debugfs: Add debug fs entry for mmc driver

2022-07-12T10:25:34+00:00

Add debug fs entry to query eMMC and SD card errors statistics Signed-off-by: Liangliang Lu Signed-off-by: Sayali Lokhande Signed-off-by: Bao D. Nguyen Signed-off-by: Shaik Sajida Bhanu Acked-by: Adrian Hunter Link: https://lore.kernel.org/r/1653674036-21829-4-git-send-email-quic_c_sbhanu@quicinc.com Signed-off-by: Ulf Hansson

mmc: debugfs: add description for module parameter

2021-06-14T11:57:43+00:00

Make it obvious what this is for. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20210604104459.7574-1-wsa+renesas@sang-engineering.com Signed-off-by: Ulf Hansson

mmc: core: Use DEFINE_DEBUGFS_ATTRIBUTE instead of DEFINE_SIMPLE_ATTRIBUTE

2020-05-28T09:21:01+00:00

Fixes coccicheck warning: drivers/mmc/core/debugfs.c:222:0-23: WARNING: mmc_clock_fops should be defined with DEFINE_DEBUGFS_ATTRIBUTE Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE for debugfs files Fixes: 703aae3d09a4b ("mmc: add a file to debugfs for changing host clock at runtime") Fixes: a04c50aaa916f ("mmc: core: no need to check return value of debugfs_create functions") Reported-by: Hulk Robot Signed-off-by: Zou Wei Link: https://lore.kernel.org/r/1587633319-19835-1-git-send-email-zou_wei@huawei.com Signed-off-by: Ulf Hansson