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scsi: ufs: add quirk to increase host PA_SaveConfigTime

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The maximum value PA_SaveConfigTime is 250 (10us) but this is not enough
for some vendors. Gear switch from PWM to HS may fail even with this
max.  PA_SaveConfigTime. Gear switch can be issued by host controller as
an error recovery and any software delay will not help on this case so
we need to increase PA_SaveConfigTime to >32us as per vendor
recommendation.  This change adds a quirk to increase the
PA_SaveConfigTime parameter.

Reviewed-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Subhash Jadavani
2016-12-05 19:25:32 -08:00
committed by Martin K. Petersen
parent ab436706e4
commit 56d4a1866d
5 changed files with 76 additions and 23 deletions
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30
drivers/scsi/ufs/ufs-qcom.c
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@@ -23,6 +23,7 @@
#include "unipro.h"
#include "ufs-qcom.h"
#include "ufshci.h"
#include "ufs_quirks.h"
#define UFS_QCOM_DEFAULT_DBG_PRINT_EN \
(UFS_QCOM_DBG_PRINT_REGS_EN | UFS_QCOM_DBG_PRINT_TEST_BUS_EN)
@@ -1031,6 +1032,34 @@ out:
return ret;
}
static int ufs_qcom_quirk_host_pa_saveconfigtime(struct ufs_hba *hba)
{
int err;
u32 pa_vs_config_reg1;
err = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_VS_CONFIG_REG1),
&pa_vs_config_reg1);
if (err)
goto out;
/* Allow extension of MSB bits of PA_SaveConfigTime attribute */
err = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_VS_CONFIG_REG1),
(pa_vs_config_reg1 | (1 << 12)));
out:
return err;
}
static int ufs_qcom_apply_dev_quirks(struct ufs_hba *hba)
{
int err = 0;
if (hba->dev_quirks & UFS_DEVICE_QUIRK_HOST_PA_SAVECONFIGTIME)
err = ufs_qcom_quirk_host_pa_saveconfigtime(hba);
return err;
}
static u32 ufs_qcom_get_ufs_hci_version(struct ufs_hba *hba)
{
struct ufs_qcom_host *host = ufshcd_get_variant(hba);
@@ -1618,6 +1647,7 @@ static struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
.hce_enable_notify = ufs_qcom_hce_enable_notify,
.link_startup_notify = ufs_qcom_link_startup_notify,
.pwr_change_notify = ufs_qcom_pwr_change_notify,
.apply_dev_quirks = ufs_qcom_apply_dev_quirks,
.suspend = ufs_qcom_suspend,
.resume = ufs_qcom_resume,
.dbg_register_dump = ufs_qcom_dump_dbg_regs,