linux-kernel - Re: [PATCH v1 2/2] mmc: mediatek: add bus

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Date:   Mon, 8 Oct 2018 13:51:15 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Chaotian Jing <chaotian.jing@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Sean Wang <sean.wang@...iatek.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v1 2/2] mmc: mediatek: add bus_clk control

On 29 September 2018 at 04:29, Chaotian Jing <chaotian.jing@...iatek.com> wrote:
> when gate MSDC0_HCLK, access register will hang, even the MSDC driver
> will never accessing register after HCLK was gated, but for safety, need
> gate the bus_clk(which used to access register) too.
>
> Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>

Applied for next, thanks!

Kind regards
Uffe

> ---
>  drivers/mmc/host/mtk-sd.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 0484138..1c1c967 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -387,6 +387,7 @@ struct msdc_host {
>
>         struct clk *src_clk;    /* msdc source clock */
>         struct clk *h_clk;      /* msdc h_clk */
> +       struct clk *bus_clk;    /* bus clock which used to access register */
>         struct clk *src_clk_cg; /* msdc source clock control gate */
>         u32 mclk;               /* mmc subsystem clock frequency */
>         u32 src_clk_freq;       /* source clock frequency */
> @@ -660,12 +661,14 @@ static void msdc_gate_clock(struct msdc_host *host)
>  {
>         clk_disable_unprepare(host->src_clk_cg);
>         clk_disable_unprepare(host->src_clk);
> +       clk_disable_unprepare(host->bus_clk);
>         clk_disable_unprepare(host->h_clk);
>  }
>
>  static void msdc_ungate_clock(struct msdc_host *host)
>  {
>         clk_prepare_enable(host->h_clk);
> +       clk_prepare_enable(host->bus_clk);
>         clk_prepare_enable(host->src_clk);
>         clk_prepare_enable(host->src_clk_cg);
>         while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
> @@ -1900,6 +1903,9 @@ static int msdc_drv_probe(struct platform_device *pdev)
>                 goto host_free;
>         }
>
> +       host->bus_clk = devm_clk_get(&pdev->dev, "bus_clk");
> +       if (IS_ERR(host->bus_clk))
> +               host->bus_clk = NULL;
>         /*source clock control gate is optional clock*/
>         host->src_clk_cg = devm_clk_get(&pdev->dev, "source_cg");
>         if (IS_ERR(host->src_clk_cg))
> --
> 1.8.1.1.dirty
>