linux-kernel - Re: [PATCH V3 2/2] mmc: sdhci-msm: Re-initialize DLL if MCLK is gated dynamically

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Message-ID: <CAE=gft6FiC5mkCDkzdhrOuj2qAfwmPxDJNbekca+EVg5yhLYgg@mail.gmail.com>
Date:   Thu, 1 Nov 2018 10:10:44 -0700
From:   Evan Green <evgreen@...omium.org>
To:     vbadigan@...eaurora.org
Cc:     adrian.hunter@...el.com, Ulf Hansson <ulf.hansson@...aro.org>,
        robh+dt@...nel.org, Doug Anderson <dianders@...gle.com>,
        asutoshd@...eaurora.org, riteshh@...eaurora.org,
        stummala@...eaurora.org, sayali <sayalil@...eaurora.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 2/2] mmc: sdhci-msm: Re-initialize DLL if MCLK is gated dynamically

On Thu, Nov 1, 2018 at 5:08 AM Veerabhadrarao Badiganti
<vbadigan@...eaurora.org> wrote:
>
> On few SDHCI-MSM controllers, the host controller's clock tuning
> circuit may go out of sync if controller clocks are gated which
> eventually will result in data CRC, command CRC/timeout errors.
> To overcome this h/w limitation, the DLL needs to be re-initialized
> and restored with its old settings once clocks are ungated.
>
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
> ---
>  drivers/mmc/host/sdhci-msm.c | 59 ++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 57 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c

Reviewed-by: Evan Green <evgreen@...omium.org>