Re: [PATCH 1/2] scsi: ufs: core: Add host quirk UFSHCD_QUIRK_MCQ_BROKEN_INTR

[Bart Van Assche <bvanassche@acm.org>]

On 3/28/23 03:37, Po-Wen Kao wrote:
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index acae4e194ec4..1e1271aca1f2 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -8493,11 +8493,15 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba)
>   static void ufshcd_config_mcq(struct ufs_hba *hba)
>   {
>   	int ret;
> -
> +	u32 intrs;
>   	ret = ufshcd_mcq_vops_config_esi(hba);
> +
>   	dev_info(hba->dev, "ESI %sconfigured\n", ret ? "is not " : "");

The use of blank lines in the above code is weird. Please make sure 
there is no blank line inside the declaration block and also that there 
is a blank line between declarations and statements as required by the 
kernel coding style.

> -	ufshcd_enable_intr(hba, UFSHCD_ENABLE_MCQ_INTRS);
> +	intrs = (hba->quirks & UFSHCD_QUIRK_MCQ_BROKEN_INTR) ?
> +		(UFSHCD_ENABLE_MCQ_INTRS & ~MCQ_CQ_EVENT_STATUS) : UFSHCD_ENABLE_MCQ_INTRS;

All parentheses in the above expression are superfluous. Please leave 
these out. Or even better, rewrite the above code as follows:

	intrs = UFSHCD_ENABLE_MCQ_INTRS;
	if (hba->quirks & UFSHCD_QUIRK_MCQ_BROKEN_INTR)
		intrs &= ~MCQ_CQ_EVENT_STATUS;

> +
> +	/*
> +	 * Some platform raises interrupt (per queue) in addition to
> +	 * CQES (traditional) when ESI is disabled.
> +	 * Enable this quirk will disable CQES and use per queue interrupt.
> +	 */
> +	UFSHCD_QUIRK_MCQ_BROKEN_INTR			= 1 << 20,

Isn't this an UFS controller behavior instead of a platform behavior? 
Please consider changing "platform raises" into "controllers raise".

Thanks,

Bart.