[PATCH V2 0/2] Fix hibern8 enter failure during host reset

[PATCH V2 0/2] Fix hibern8 enter failure during host reset

[Nitin Rawat]

Changes from V1:
- Updated commit description to explain the patch.
- Added Co-developed-by tag.

Nitin Rawat (2):
  scsi: ufs: core: Export ufshcd_is_hba_active
  scsi: ufs: ufs-qcom: check host controller state

 drivers/ufs/core/ufshcd.c   | 3 ++-
 drivers/ufs/host/ufs-qcom.c | 4 ++++
 include/ufs/ufshcd.h        | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

--
2.17.1

[PATCH V2 1/2] scsi: ufs: core: Export ufshcd_is_hba_active

[Nitin Rawat]

Export ufshcd_is_hba_active() to allow vendor driver modules
to check the state of host controller.

Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
---
 drivers/ufs/core/ufshcd.c | 3 ++-
 include/ufs/ufshcd.h      | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 983fae84d9e8..962aa5c1fe69 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -995,10 +995,11 @@ static inline void ufshcd_hba_start(struct ufs_hba *hba)
  *
  * Returns true if and only if the controller is active.
  */
-static inline bool ufshcd_is_hba_active(struct ufs_hba *hba)
+bool ufshcd_is_hba_active(struct ufs_hba *hba)
 {
 	return ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & CONTROLLER_ENABLE;
 }
+EXPORT_SYMBOL_GPL(ufshcd_is_hba_active);

 u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba)
 {
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 6dc11fa0ebb1..ef04c3363be8 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -1398,6 +1398,7 @@ int ufshcd_wb_toggle_buf_flush(struct ufs_hba *hba, bool enable);
 int ufshcd_suspend_prepare(struct device *dev);
 int __ufshcd_suspend_prepare(struct device *dev, bool rpm_ok_for_spm);
 void ufshcd_resume_complete(struct device *dev);
+bool ufshcd_is_hba_active(struct ufs_hba *hba);

 /* Wrapper functions for safely calling variant operations */
 static inline int ufshcd_vops_init(struct ufs_hba *hba)
--
2.17.1

[PATCH V2 2/2] scsi: ufs: ufs-qcom: check host controller state

[Nitin Rawat]

Commit <52a518019ca1> (Fix missing clk change notification) added UFS
clock scaling notification to ufshcd_host_reset_and_restore. This
invokes hibern8 enter and exit on qualcomm platform which fails because
controller is in reset state.

Fix this by checking the Host controller state before sending
hibern8 command.

__ufshcd_wl_resume()
ufshcd_reset_and_restore()
ufshcd_host_reset_and_restore()
ufshcd_scale_clks()
ufshcd_vops_clk_scale_notify()
ufs_qcom_clk_scale_notify()
ufshcd_uic_hibern8_enter()

Fixes: 52a518019ca1 ("scsi: ufs: core: Fix missing clk change notification on host reset")

Co-developed-by: Manish Pandey <quic_mapa@quicinc.com>
Signed-off-by: Manish Pandey <quic_mapa@quicinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 8d6fd4c3324f..95412e98a598 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1254,6 +1254,10 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
 	struct ufs_pa_layer_attr *dev_req_params = &host->dev_req_params;
 	int err = 0;

+	/* check the host controller state before sending hibern8 cmd */
+	if (!ufshcd_is_hba_active(hba))
+		return 0;
+
 	if (status == PRE_CHANGE) {
 		err = ufshcd_uic_hibern8_enter(hba);
 		if (err)
--
2.17.1

Re: [PATCH V2 1/2] scsi: ufs: core: Export ufshcd_is_hba_active

[Manivannan Sadhasivam]

On Wed, Jul 26, 2023 at 07:11:39PM +0530, Nitin Rawat wrote:
> Export ufshcd_is_hba_active() to allow vendor driver modules
> to check the state of host controller.
> 
> Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>

Acked-by: Manivannan Sadhasivam <mani@kernel.org>

- Mani

> ---
>  drivers/ufs/core/ufshcd.c | 3 ++-
>  include/ufs/ufshcd.h      | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 983fae84d9e8..962aa5c1fe69 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -995,10 +995,11 @@ static inline void ufshcd_hba_start(struct ufs_hba *hba)
>   *
>   * Returns true if and only if the controller is active.
>   */
> -static inline bool ufshcd_is_hba_active(struct ufs_hba *hba)
> +bool ufshcd_is_hba_active(struct ufs_hba *hba)
>  {
>  	return ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & CONTROLLER_ENABLE;
>  }
> +EXPORT_SYMBOL_GPL(ufshcd_is_hba_active);
> 
>  u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba)
>  {
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index 6dc11fa0ebb1..ef04c3363be8 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -1398,6 +1398,7 @@ int ufshcd_wb_toggle_buf_flush(struct ufs_hba *hba, bool enable);
>  int ufshcd_suspend_prepare(struct device *dev);
>  int __ufshcd_suspend_prepare(struct device *dev, bool rpm_ok_for_spm);
>  void ufshcd_resume_complete(struct device *dev);
> +bool ufshcd_is_hba_active(struct ufs_hba *hba);
> 
>  /* Wrapper functions for safely calling variant operations */
>  static inline int ufshcd_vops_init(struct ufs_hba *hba)
> --
> 2.17.1
> 

-- 
மணிவண்ணன் சதாசிவம்

Re: [PATCH V2 2/2] scsi: ufs: ufs-qcom: check host controller state

[Manivannan Sadhasivam]

On Wed, Jul 26, 2023 at 07:11:40PM +0530, Nitin Rawat wrote:
> Commit <52a518019ca1> (Fix missing clk change notification) added UFS
> clock scaling notification to ufshcd_host_reset_and_restore. This
> invokes hibern8 enter and exit on qualcomm platform which fails because
> controller is in reset state.
> 
> Fix this by checking the Host controller state before sending
> hibern8 command.
> 
> __ufshcd_wl_resume()
> ufshcd_reset_and_restore()
> ufshcd_host_reset_and_restore()
> ufshcd_scale_clks()
> ufshcd_vops_clk_scale_notify()
> ufs_qcom_clk_scale_notify()
> ufshcd_uic_hibern8_enter()
> 
> Fixes: 52a518019ca1 ("scsi: ufs: core: Fix missing clk change notification on host reset")
> 

Nit: No need of a newline here.

> Co-developed-by: Manish Pandey <quic_mapa@quicinc.com>
> Signed-off-by: Manish Pandey <quic_mapa@quicinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>

Acked-by: Manivannan Sadhasivam <mani@kernel.org>

- Mani

> ---
>  drivers/ufs/host/ufs-qcom.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 8d6fd4c3324f..95412e98a598 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1254,6 +1254,10 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
>  	struct ufs_pa_layer_attr *dev_req_params = &host->dev_req_params;
>  	int err = 0;
> 
> +	/* check the host controller state before sending hibern8 cmd */
> +	if (!ufshcd_is_hba_active(hba))
> +		return 0;
> +
>  	if (status == PRE_CHANGE) {
>  		err = ufshcd_uic_hibern8_enter(hba);
>  		if (err)
> --
> 2.17.1
> 

-- 
மணிவண்ணன் சதாசிவம்

Re: [PATCH V2 0/2] Fix hibern8 enter failure during host reset

[Martin K. Petersen]

Nitin,

> Nitin Rawat (2):
>   scsi: ufs: core: Export ufshcd_is_hba_active
>   scsi: ufs: ufs-qcom: check host controller state

Applied to 6.6/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering

Re: [PATCH V2 0/2] Fix hibern8 enter failure during host reset

[Martin K. Petersen]

On Wed, 26 Jul 2023 19:11:38 +0530, Nitin Rawat wrote:

> Changes from V1:
> - Updated commit description to explain the patch.
> - Added Co-developed-by tag.
> 
> Nitin Rawat (2):
>   scsi: ufs: core: Export ufshcd_is_hba_active
>   scsi: ufs: ufs-qcom: check host controller state
> 
> [...]

Applied to 6.6/scsi-queue, thanks!

[1/2] scsi: ufs: core: Export ufshcd_is_hba_active
      https://git.kernel.org/mkp/scsi/c/548fdf771b8e
[2/2] scsi: ufs: ufs-qcom: check host controller state
      https://git.kernel.org/mkp/scsi/c/21f04fb4e8ca

-- 
Martin K. Petersen	Oracle Linux Engineering