linux-kernel - [PATCH v1 2/2] mmc-utils: Add note for CMDQ_MODE

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Date:   Sun, 14 Nov 2021 21:43:31 +0100
From:   Bean Huo <huobean@...il.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     beanhuo@...ron.com
Subject: [PATCH v1 2/2] mmc-utils: Add note for CMDQ_MODE_EN runtime value

From: Bean Huo <beanhuo@...ron.com>

Since the Linux kernel commit 70b52f090805 ("mmc: block: Disable CMDQ on
the ioctl path"), CMDQ in CMDQ_MODE_EN[15] is disabled before reading EXT_CSD.
Therefore, it is more accurate to use sysfs node to check CMDQ_MODE_EN value.
Add a note print to highlight.

Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 mmc_cmds.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mmc_cmds.c b/mmc_cmds.c
index ecbde3937c81..46c5f5faae02 100644
--- a/mmc_cmds.c
+++ b/mmc_cmds.c
@@ -1885,6 +1885,8 @@ int do_read_extcsd(int nargs, char **argv)
 		       (ext_csd[EXT_CSD_CMDQ_DEPTH] & 0x1f) + 1);
 		printf("Command Enabled [CMDQ_MODE_EN]: 0x%02x\n",
 		       ext_csd[EXT_CSD_CMDQ_MODE_EN]);
+		printf("Note: CMDQ_MODE_EN may not indicate the runtime CMDQ ON or OFF.\n"
+		       "Please check sysfs node '/sys/devices/.../mmc_host/mmcX/mmcX:XXXX/cmdq_en'\n");
 	}
 out_free:
 	return ret;
-- 
2.25.1