linux-kernel - Re: [PATCH v2 3/3] drm/rockchip: dsi: Disable PLL clock on bind error

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Date:   Tue, 28 Sep 2021 12:16:31 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Heiko Stübner <heiko@...ech.de>,
        Thomas Hebb <tommyhebb@...il.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Sandy Huang <hjc@...k-chips.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] drm/rockchip: dsi: Disable PLL clock on bind error

On Tue, Sep 28, 2021 at 2:00 AM Brian Norris <briannorris@...omium.org> wrote:
>
> Fix some error handling here noticed in review of other changes.
>
> Reported-by: Chen-Yu Tsai <wenst@...omium.org>
> Signed-off-by: Brian Norris <briannorris@...omium.org>

Fixes: 2d4f7bdafd70 ("drm/rockchip: dsi: migrate to use dw-mipi-dsi
bridge driver")

Otherwise,

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>

Additionally, I would move patch 2 and this patch before the first patch,
as these two fix a commit introduced in v5.0, while the first patch fixes
something introduced in v5.14. This would make automatic backporting cleaner.

> ---
>
> Changes in v2:
> - New
>
>  drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> index fa4080176719..0ed13d81fe60 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> @@ -943,7 +943,7 @@ static int dw_mipi_dsi_rockchip_bind(struct device *dev,
>         ret = clk_prepare_enable(dsi->grf_clk);
>         if (ret) {
>                 DRM_DEV_ERROR(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
> -               goto out_pm_runtime;
> +               goto out_pll_clk;
>         }
>
>         dw_mipi_dsi_rockchip_config(dsi);
> @@ -955,17 +955,19 @@ static int dw_mipi_dsi_rockchip_bind(struct device *dev,
>         ret = rockchip_dsi_drm_create_encoder(dsi, drm_dev);
>         if (ret) {
>                 DRM_DEV_ERROR(dev, "Failed to create drm encoder\n");
> -               goto out_pm_runtime;
> +               goto out_pll_clk;
>         }
>
>         ret = dw_mipi_dsi_bind(dsi->dmd, &dsi->encoder);
>         if (ret) {
>                 DRM_DEV_ERROR(dev, "Failed to bind: %d\n", ret);
> -               goto out_pm_runtime;
> +               goto out_pll_clk;
>         }
>
>         return 0;
>
> +out_pll_clk:
> +       clk_disable_unprepare(dsi->pllref_clk);
>  out_pm_runtime:
>         pm_runtime_put(dsi->dev);
>         if (dsi->slave)
> --
> 2.33.0.685.g46640cef36-goog
>