6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Peter Wang peter.wang@mediatek.com
commit 7f45ed5f0cd5ccbbec79adc6c48a67d6a85fba56 upstream.
When the power mode change is successful but the power mode hasn't actually changed, the post notification was missed. Similar to the approach with hibernate/clock scale/hce enable, having pre/post notifications in the same function will make it easier to maintain.
Additionally, supplement the description of power parameters for the pwr_change_notify callback.
Fixes: 7eb584db73be ("ufs: refactor configuring power mode") Cc: stable@vger.kernel.org #6.11.x Signed-off-by: Peter Wang peter.wang@mediatek.com Link: https://lore.kernel.org/r/20241122024943.30589-1-peter.wang@mediatek.com Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/ufs/core/ufshcd.c | 7 ++++--- include/ufs/ufshcd.h | 10 ++++++---- 2 files changed, 10 insertions(+), 7 deletions(-)
--- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -4449,9 +4449,6 @@ static int ufshcd_change_power_mode(stru dev_err(hba->dev, "%s: power mode change failed %d\n", __func__, ret); } else { - ufshcd_vops_pwr_change_notify(hba, POST_CHANGE, NULL, - pwr_mode); - memcpy(&hba->pwr_info, pwr_mode, sizeof(struct ufs_pa_layer_attr)); } @@ -4478,6 +4475,10 @@ int ufshcd_config_pwr_mode(struct ufs_hb
ret = ufshcd_change_power_mode(hba, &final_params);
+ if (!ret) + ufshcd_vops_pwr_change_notify(hba, POST_CHANGE, NULL, + &final_params); + return ret; } EXPORT_SYMBOL_GPL(ufshcd_config_pwr_mode); --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -281,7 +281,9 @@ struct ufs_pwr_mode_info { * to allow variant specific Uni-Pro initialization. * @pwr_change_notify: called before and after a power mode change * is carried out to allow vendor spesific capabilities - * to be set. + * to be set. PRE_CHANGE can modify final_params based + * on desired_pwr_mode, but POST_CHANGE must not alter + * the final_params parameter * @setup_xfer_req: called before any transfer request is issued * to set some things * @setup_task_mgmt: called before any task management request is issued @@ -312,9 +314,9 @@ struct ufs_hba_variant_ops { int (*link_startup_notify)(struct ufs_hba *, enum ufs_notify_change_status); int (*pwr_change_notify)(struct ufs_hba *, - enum ufs_notify_change_status status, - struct ufs_pa_layer_attr *, - struct ufs_pa_layer_attr *); + enum ufs_notify_change_status status, + struct ufs_pa_layer_attr *desired_pwr_mode, + struct ufs_pa_layer_attr *final_params); void (*setup_xfer_req)(struct ufs_hba *hba, int tag, bool is_scsi_cmd); void (*setup_task_mgmt)(struct ufs_hba *, int, u8);