linux-kernel - Re: [PATCH] phy: ufs-qcom: Invert PCS ready logic for SDM845 UFS

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Date:   Tue, 10 Dec 2019 10:49:47 -0800
From:   Evan Green <evgreen@...omium.org>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Can Guo <cang@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH] phy: ufs-qcom: Invert PCS ready logic for SDM845 UFS

On Mon, Dec 9, 2019 at 2:00 PM Evan Green <evgreen@...omium.org> wrote:
>
> The SDM845 UFS phy seems to want to do a low transition to become
> ready, rather than a high transition. Without this, I am unable to
> enumerate UFS on SDM845 when booted from USB.
>
> Fixes: 14ced7e3a1a ('phy: qcom-qmp: Correct ready status, again')
>
> Signed-off-by: Evan Green <evgreen@...omium.org>
> ---
>
> Bjorn,
> At this point I'm super confused on what the correct behavior
> should be. Lack of documentation doesn't help. I'm worried that this
> change breaks UFS on some other platforms, so I'm hoping you or some
> PHY folks might have some advice on what the right thing to do is.

Disregard this patch. Bjorn pointed me to the patch below, which is
the right fix for my issue:
https://lore.kernel.org/linux-arm-msm/20191107000917.1092409-3-bjorn.andersson@linaro.org/