Re: [PATCH] ufs: mcq: Adding a function for MCQ enable

Peter Wang (王信友)
2023-12-20T07:03:19Z

On Wed, 2023-12-20 at 14:27 +0900, Chanwoo Lee wrote:
>
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> From: ChanWoo Lee <cw9316.lee@samsung.com>
>
> The REG_UFS_MEM_CFG register is too general(broad)
> and it is difficult to know the meaning of only values of 0x1 and
> 0x2.
> So far, comments were required.
>
> Therefore, I have added new functions and defines
> to improve code readability/reusability.
>
> Signed-off-by: ChanWoo Lee <cw9316.lee@samsung.com>
> ---
> drivers/ufs/core/ufs-mcq.c | 10 +++++++++-
> drivers/ufs/core/ufshcd.c | 5 +----
> drivers/ufs/host/ufs-mediatek.c | 4 +---
> include/ufs/ufshcd.h | 1 +
> include/ufs/ufshci.h | 4 ++++
> 5 files changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 0787456c2b89..a34ef3aac540 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -394,11 +394,19 @@
> EXPORT_SYMBOL_GPL(ufshcd_mcq_make_queues_operational);
>
> void ufshcd_mcq_enable_esi(struct ufs_hba *hba)
> {
> -ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x2,
> +ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | ESI_ENABLE,
> REG_UFS_MEM_CFG);
> }
> EXPORT_SYMBOL_GPL(ufshcd_mcq_enable_esi);
>
> +void ufshcd_mcq_enable(struct ufs_hba *hba)
> +{
> +ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) |
> MCQ_MODE_SELECT,
> + REG_UFS_MEM_CFG);
> +hba->mcq_enabled = true;
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_enable);
> +
> void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg)
> {
> ufshcd_writel(hba, msg->address_lo, REG_UFS_ESILBA);
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index ae9936fc6ffb..8195e01e7a3f 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -8723,10 +8723,7 @@ static void ufshcd_config_mcq(struct ufs_hba
> *hba)
> hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
> hba->reserved_slot = hba->nutrs - UFSHCD_NUM_RESERVED;
>
> -/* Select MCQ mode */
> -ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
> - REG_UFS_MEM_CFG);
> -hba->mcq_enabled = true;
> +ufshcd_mcq_enable(hba);
>
> dev_info(hba->dev, "MCQ configured, nr_queues=%d, io_queues=%d,
> read_queue=%d, poll_queues=%d, queue_depth=%d\n",
> hba->nr_hw_queues, hba->nr_queues[HCTX_TYPE_DEFAULT],
> diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-
> mediatek.c
> index fc61790d289b..1048add66419 100644
> --- a/drivers/ufs/host/ufs-mediatek.c
> +++ b/drivers/ufs/host/ufs-mediatek.c
> @@ -1219,9 +1219,7 @@ static int ufs_mtk_link_set_hpm(struct ufs_hba
> *hba)
> ufs_mtk_config_mcq(hba, false);
> ufshcd_mcq_make_queues_operational(hba);
> ufshcd_mcq_config_mac(hba, hba->nutrs);
> -/* Enable MCQ mode */
> -ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
> - REG_UFS_MEM_CFG);
> +ufshcd_mcq_enable(hba);

Hi Chanwoo,

It is better change 0x1 to MCQ_MODE_SELECT only.
And do not change hba->mcq_enabled value because we enable mcq
by check hba->mcq_enabled is true.

Thanks.
Peter

> }
>
> if (err)
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index d862c8ddce03..a96c45fa4b4b 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -1257,6 +1257,7 @@ unsigned long ufshcd_mcq_poll_cqe_lock(struct
> ufs_hba *hba,
> struct ufs_hw_queue *hwq);
> void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
> void ufshcd_mcq_enable_esi(struct ufs_hba *hba);
> +void ufshcd_mcq_enable(struct ufs_hba *hba);
> void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg
> *msg);
>
> int ufshcd_opp_config_clks(struct device *dev, struct opp_table
> *opp_table,
> diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h
> index d5accacae6bc..e669fad11fd4 100644
> --- a/include/ufs/ufshci.h
> +++ b/include/ufs/ufshci.h
> @@ -282,6 +282,10 @@ enum {
> /* UTMRLRSR - UTP Task Management Request Run-Stop Register 80h */
> #define UTP_TASK_REQ_LIST_RUN_STOP_BIT0x1
>
> +/* REG_UFS_MEM_CFG - Global Config Registers 300h */
> +#define MCQ_MODE_SELECT 0x1
> +#define ESI_ENABLE0x2
> +
> /* CQISy - CQ y Interrupt Status Register */
> #define UFSHCD_MCQ_CQIS_TAIL_ENT_PUSH_STS0x1
>
> --
> 2.29.0
>