linux-kernel - Re: [PATCH 1/1] scsi: ufs-mediatek: Add UFSHCD_QUIRK_BROKEN_LSDBS

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Message-ID: <20240819120852.tdxlebj7pjcxjbou@thinkpad>
Date: Mon, 19 Aug 2024 17:38:52 +0530
From: Manivannan Sadhasivam <manisadhasivam.linux@...il.com>
To: Mary Guillemard <mary@...y.zone>
Cc: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Peter Wang <peter.wang@...iatek.com>,
	Stanley Jhu <chu.stanley@...il.com>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH 1/1] scsi: ufs-mediatek: Add UFSHCD_QUIRK_BROKEN_LSDBS_CAP

On Mon, Aug 19, 2024 at 12:24:42AM +0200, Mary Guillemard wrote:
> MT8183 supports UFSHCI 2.1 spec, but report a bogus value of 1 in the
> reserved part for the Legacy Single Doorbell Support (LSDBS) capability.
> 

Wow... I never thought that this quirk will be used outside of Qcom SoCs...

> This set UFSHCD_QUIRK_BROKEN_LSDBS_CAP when MCQ support is explicitly
> disabled, allowing the device to be properly registered.
> 
> Signed-off-by: Mary Guillemard <mary@...y.zone>
> ---
>  drivers/ufs/host/ufs-mediatek.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
> index 02c9064284e1..9a5919434c4e 100644
> --- a/drivers/ufs/host/ufs-mediatek.c
> +++ b/drivers/ufs/host/ufs-mediatek.c
> @@ -1026,6 +1026,9 @@ static int ufs_mtk_init(struct ufs_hba *hba)
>  	if (host->caps & UFS_MTK_CAP_DISABLE_AH8)
>  		hba->caps |= UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
>  
> +	if (host->caps & UFS_MTK_CAP_DISABLE_MCQ)

How can this be the deciding factor? You said above that the issue is with
MT8183 SoC. So why not just use the quirk only for that platform?

- Mani

> +		hba->quirks |= UFSHCD_QUIRK_BROKEN_LSDBS_CAP;
> +
>  	ufs_mtk_init_clocks(hba);
>  
>  	/*
> -- 
> 2.46.0
> 
> 

-- 
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