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scsi: ufs: add quirk for delay before dme commands

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add delay before each dme command (get, set), as this delay is
required for stability purposes.

Change-Id: I5aca4c25f251c41c6764269366a8ca7235ffafc1
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
[subhashj@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[venkatg@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
This commit is contained in:
Yaniv Gardi 2013-10-25 10:09:21 +03:00 • committed by David Keitel
parent e6aa6d8e5a
commit 9da665ff6d
2 changed files with 14 additions and 0 deletions
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8
drivers/scsi/ufs/ufshcd.c
View file

@ -2243,6 +2243,10 @@ int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
uic_cmd.argument3 = mib_val;
/* for stability purposes */
if (hba->quirks & UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS)
usleep_range(1000, 1100);
ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
if (ret)
dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
@ -2301,6 +2305,10 @@ int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
uic_cmd.argument1 = attr_sel;
/* for stability purposes */
if (hba->quirks & UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS)
usleep_range(1000, 1100);
ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
if (ret) {
dev_err(hba->dev, "%s: attr-id 0x%x error code %d\n",

6
drivers/scsi/ufs/ufshcd.h
View file

@ -508,6 +508,12 @@ struct ufs_hba {
/* UFSHC advertises 64-bit not supported even though it supports */
#define UFSHCD_QUIRK_BROKEN_CAP_64_BIT_0 (1 << 3)
/*
* delay before each dme command is required as the unipro
* layer has shown instabilities
*/
#define UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS (1 << 7)
struct uic_command *active_uic_cmd;
struct mutex uic_cmd_mutex;
struct completion *uic_async_done;