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scsi: ufs: exynos: gs101: Put UFS device in reset on .suspend()

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GPIO_OUT[0] is connected to the reset pin of embedded UFS device.
Before powering off the phy assert the reset signal.

This is added as a gs101 specific suspend hook so as not to have any
unintended consequences for other SoCs supported by this driver.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Link: https://lore.kernel.org/r/20250319-exynos-ufs-stability-fixes-v2-7-96722cc2ba1b@linaro.org
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Peter Griffin
2025-03-19 15:30:24 +00:00
committed by Martin K. Petersen
parent 67e4085015
commit cd4c002506
2 changed files with 11 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/ufs/host/ufs-exynos.c
View File

@@ -1700,6 +1700,12 @@ static void exynos_ufs_hibern8_notify(struct ufs_hba *hba,
}
}
static int gs101_ufs_suspend(struct exynos_ufs *ufs)
{
hci_writel(ufs, 0 << 0, HCI_GPIO_OUT);
return 0;
}
static int exynos_ufs_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
enum ufs_notify_change_status status)
{
@@ -1708,6 +1714,9 @@ static int exynos_ufs_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
if (status == PRE_CHANGE)
return 0;
if (ufs->drv_data->suspend)
ufs->drv_data->suspend(ufs);
if (!ufshcd_is_link_active(hba))
phy_power_off(ufs->phy);
@@ -2170,6 +2179,7 @@ static const struct exynos_ufs_drv_data gs101_ufs_drvs = {
.pre_link = gs101_ufs_pre_link,
.post_link = gs101_ufs_post_link,
.pre_pwr_change = gs101_ufs_pre_pwr_change,
.suspend = gs101_ufs_suspend,
};
static const struct of_device_id exynos_ufs_of_match[] = {

1
drivers/ufs/host/ufs-exynos.h
View File

@@ -192,6 +192,7 @@ struct exynos_ufs_drv_data {
struct ufs_pa_layer_attr *pwr);
int (*pre_hce_enable)(struct exynos_ufs *ufs);
int (*post_hce_enable)(struct exynos_ufs *ufs);
int (*suspend)(struct exynos_ufs *ufs);
};
struct ufs_phy_time_cfg {