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Commit 647827f5 authored by Liangliang Lu's avatar Liangliang Lu
Browse files

mmc: mmc-debugfs: add error state 



This change adds support to allow user space query if low level eMMC
driver has encountered any error or not, this state can be read/cleared
via debugfs.

CRs-Fixed: 1056483
Change-Id: Idc4ea375e9f308446dec04d443d062fe502658bd
Signed-off-by: default avatarLiangliang Lu <luliang@codeaurora.org>
parent 14f889c8

drivers/mmc/core/debugfs.c

+31 −0
Original line number Diff line number Diff line
@@ -303,6 +303,33 @@ static int mmc_force_err_set(void *data, u64 val) 


DEFINE_SIMPLE_ATTRIBUTE(mmc_force_err_fops, NULL, mmc_force_err_set, "%llu\n");



static int mmc_err_state_get(void *data, u64 *val)

{

	struct mmc_host *host = data;



	if (!host)

		return -EINVAL;



	*val = host->err_occurred ? 1 : 0;



	return 0;

}



static int mmc_err_state_clear(void *data, u64 val)

{

	struct mmc_host *host = data;



	if (!host)

		return -EINVAL;



	host->err_occurred = false;



	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get,

		mmc_err_state_clear, "%llu\n");



void mmc_add_host_debugfs(struct mmc_host *host)

{

	struct dentry *root;
@@ -343,6 +370,10 @@ void mmc_add_host_debugfs(struct mmc_host *host) 
		&host->cmdq_thist_enabled))

		goto err_node;



	if (!debugfs_create_file("err_state", S_IRUSR | S_IWUSR, root, host,

		&mmc_err_state))

		goto err_node;



#ifdef CONFIG_MMC_CLKGATE

	if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),

				root, &host->clk_delay))

include/linux/mmc/host.h

+2 −0
Original line number Diff line number Diff line
@@ -517,6 +517,8 @@ struct mmc_host { 


	struct dentry		*debugfs_root;



	bool			err_occurred;



	struct mmc_async_req	*areq;		/* active async req */

	struct mmc_context_info	context_info;	/* async synchronization info */