Re: [PATCH v1 02/16] ufs: core: Introduce Multi-circular queue capability

Manivannan Sadhasivam
2022-09-26T15:44:44Z

On Thu, Sep 22, 2022 at 06:05:09PM -0700, Asutosh Das wrote:
> Adds support to check for MCQ capability in the UFSHC.
> This capability can be used by host drivers to control
> MCQ enablement.
>
> Co-developed-by: Can Guo <quic_cang@quicinc.com>
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
> ---
> drivers/ufs/core/ufshcd.c | 5 +++++
> include/ufs/ufshcd.h | 13 +++++++++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 4b9ae83..24661fc 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -89,6 +89,7 @@
> #define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */
>
> #define EXT_IID_CAP_SHIFT 10
> +#define MCQ_SUPP_SHIFT 30
> #define ufshcd_toggle_vreg(_dev, _vreg, _on) \
> ({ \
> int _ret; \
> @@ -2240,6 +2241,10 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
> if (err)
> dev_err(hba->dev, "crypto setup failed\n");
>
> + hba->mcq_sup = (hba->capabilities & MASK_MCQ_SUPPORT) >> MCQ_SUPP_SHIFT;

Again, if you use FIELD_* macro, addtional *_SHIFT macro is not needed.

> + if (!hba->mcq_sup)
> + return err;

Since this is not an error case, you can return 0 explicitly.

> +
> hba->mcq_capabilities = ufshcd_readl(hba, REG_MCQCAP);
> hba->ext_iid_sup = (hba->mcq_capabilities & MASK_EXT_IID_SUPPORT) >>
> EXT_IID_CAP_SHIFT;
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index da1eb8a..da7ec0c 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -660,6 +660,12 @@ enum ufshcd_caps {
> * notification if it is supported by the UFS device.
> */
> UFSHCD_CAP_TEMP_NOTIF = 1 << 11,
> +
> + /*
> + * This capability allows the host controller driver to turn on/off
> + * MCQ mode. MCQ mode may be used to increase performance.
> + */
> + UFSHCD_CAP_MCQ_EN = 1 << 12,
> };
>
> struct ufs_hba_variant_params {
> @@ -820,6 +826,7 @@ struct ufs_hba_monitor {
> * @complete_put: whether or not to call ufshcd_rpm_put() from inside
> * ufshcd_resume_complete()
> * @ext_iid_sup: is EXT_IID is supported by UFSHC
> + * @mcq_sup: is mcq supported by UFSHC
> */
> struct ufs_hba {
> void __iomem *mmio_base;
> @@ -969,8 +976,14 @@ struct ufs_hba {
> u32 luns_avail;
> bool complete_put;
> bool ext_iid_sup;
> + bool mcq_sup;
> };
>
> +static inline bool is_mcq_supported(struct ufs_hba *hba)

No inline please. Compiler is the best judge.

Thanks,
Mani

> +{
> + return hba->mcq_sup && (hba->caps & UFSHCD_CAP_MCQ_EN);
> +}
> +
> /* Returns true if clocks can be gated. Otherwise false */
> static inline bool ufshcd_is_clkgating_allowed(struct ufs_hba *hba)
> {
> --
> 2.7.4
>

--
மணிவண்ணன் சதாசிவம்