linux-kernel - Re: [PATCH 2/2] drm/meson: dw-hdmi: Enable the iahb clock early enough

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Date:   Fri, 20 Nov 2020 13:27:07 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Marc Zyngier <maz@...nel.org>, Kevin Hilman <khilman@...libre.com>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Guillaume Tucker <guillaume.tucker@...labora.com>,
        kernel-team@...roid.com, dri-devel@...ts.freedesktop.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/meson: dw-hdmi: Enable the iahb clock early
 enough

On 20/11/2020 10:42, Marc Zyngier wrote:
> Instead of moving meson_dw_hdmi_init() around which breaks existing
> platform, let's enable the clock meson_dw_hdmi_init() depends on.
> This means we don't have to worry about this clock being enabled or
> not, depending on the boot-loader features.
> 
> Fixes: b33340e33acd ("drm/meson: dw-hdmi: Ensure that clocks are enabled before touching the TOP registers")
> Reported-by: Guillaume Tucker <guillaume.tucker@...labora.com>
> Tested-by: Guillaume Tucker <guillaume.tucker@...labora.com>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>  drivers/gpu/drm/meson/meson_dw_hdmi.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> index 29623b309cb1..aad75a22dc33 100644
> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> @@ -1051,6 +1051,10 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>  	if (ret)
>  		return ret;
>  
> +	ret = meson_enable_clk(dev, "iahb");
> +	if (ret)
> +		return ret;
> +
>  	ret = meson_enable_clk(dev, "venci");
>  	if (ret)
>  		return ret;
> @@ -1086,6 +1090,8 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>  
>  	encoder->possible_crtcs = BIT(0);
>  
> +	meson_dw_hdmi_init(meson_dw_hdmi);
> +
>  	DRM_DEBUG_DRIVER("encoder initialized\n");
>  
>  	/* Bridge / Connector */
> @@ -1110,8 +1116,6 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>  	if (IS_ERR(meson_dw_hdmi->hdmi))
>  		return PTR_ERR(meson_dw_hdmi->hdmi);
>  
> -	meson_dw_hdmi_init(meson_dw_hdmi);
> -
>  	next_bridge = of_drm_find_bridge(pdev->dev.of_node);
>  	if (next_bridge)
>  		drm_bridge_attach(encoder, next_bridge,
> 
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>