linux-kernel - Re: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset

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Date:   Fri, 20 Dec 2019 13:23:38 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Can Guo <cang@...eaurora.org>
Cc:     Asutosh Das <asutoshd@...eaurora.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset

On 20-12-19, 15:41, Can Guo wrote:
> On 2019-12-20 15:10, Vinod Koul wrote:
> > On 20-12-19, 14:00, Can Guo wrote:
> Hi Vinod
> 
> We are just removing the no_pcs_sw_reset for 8150, right? Why is it
> possibly impacting 845 or older paltforms?
> 
> In future, we will no longer need no_pcs_sw_reset for any newer QCOM UFS
> PHY designs, as it is only for 845 and older platforms.
> 
> I am sure QPHY_SW_RESET will be within PHY's address space since 8150.
> Otherwise, it will be a regression in UFS PHY design. We had a lot of
> discussion about this on 845 years ago, then design team decided to add
> it on later platforms, so I don't see a reason to remove it again. :)
> 
> I am not sure about the other qmp phys, but so long as UFS PHY needs the
> reset, we need to keep it, as phy-qcom-qmp.c is a common driver. I am
> not sure if I get your point here. Please correct me I am wrong.

The argument here is that we are making this UFS specific and we do not
know if this will be true in future as QMP is a common phy, so adding a
separate flag helps to keep it independent and to be used in other
situations.

Thanks
-- 
~Vinod