linux-kernel - Re: [PATCH 2/3] scsi: ufs: qcom: Clarify the comment of core

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Date: Tue, 30 Jan 2024 11:12:24 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Andrew Halaney <ahalaney@...hat.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Avri Altman <avri.altman@....com>,
	Bart Van Assche <bvanassche@....org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Andy Gross <agross@...nel.org>,
	Andy Gross <andy.gross@...aro.org>,
	"James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] scsi: ufs: qcom: Clarify the comment of core_reset
 property

On Mon, Jan 29, 2024 at 02:57:20PM -0600, Andrew Halaney wrote:
> On Mon, Jan 29, 2024 at 01:22:05PM +0530, Manivannan Sadhasivam wrote:
> > core_reset is not an optional property for the platforms supported in
> > upstream. Only for the non-upstreamed legacy platforms it is optional.
> > But somehow a few of the upstreamed platforms do not pass this property
> > by mistake.
> > 
> > So clarify the comment to make it clear that even though core_reset is
> > required, it is kept as optional to support the DTs that do not pass this
> > property.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  drivers/ufs/host/ufs-qcom.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> > index 39eef470f8fa..32760506dfeb 100644
> > --- a/drivers/ufs/host/ufs-qcom.c
> > +++ b/drivers/ufs/host/ufs-qcom.c
> > @@ -1027,7 +1027,11 @@ static int ufs_qcom_init(struct ufs_hba *hba)
> >  	host->hba = hba;
> >  	ufshcd_set_variant(hba, host);
> >  
> > -	/* Setup the optional reset control of HCI */
> > +	/*
> > +	 * Even though core_reset is required on all platforms, some DTs never
> > +	 * passed this property. So we have to keep it optional for supporting
> > +	 * them.
> > +	 */
> 
> Any desire to print a warning if !host->core_reset? I'll defer to
> Qualcomm to review since they can confirm the accuracy past Can's
> comment, but this looks good to me for what its worth.
> 

My only worry is that the existing users of the legacy DTs will get annoyed by
the warning. And I'm not sure if we can do that.

- Mani

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