[PATCHv2 4/4] drm: exynos: hdmi: add support for pixel clock limitation

[Lucas Stach]

Am Dienstag, den 15.04.2014, 11:27 +0200 schrieb Tomasz Stanislawski:
> Adds support for limitation of maximal pixel clock of HDMI
> signal. This feature is needed on boards that contains
> lines or bridges with frequency limitations.
> 
> Signed-off-by: Tomasz Stanislawski <t.stanislaws at samsung.com>
> ---
>  .../devicetree/bindings/video/exynos_hdmi.txt      |    4 ++++
>  drivers/gpu/drm/exynos/exynos_hdmi.c               |   12 ++++++++++++
>  include/media/s5p_hdmi.h                           |    1 +
>  3 files changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/video/exynos_hdmi.txt b/Documentation/devicetree/bindings/video/exynos_hdmi.txt
> index f9187a2..8718f8d 100644
> --- a/Documentation/devicetree/bindings/video/exynos_hdmi.txt
> +++ b/Documentation/devicetree/bindings/video/exynos_hdmi.txt
> @@ -28,6 +28,10 @@ Required properties:
>  - ddc: phandle to the hdmi ddc node
>  - phy: phandle to the hdmi phy node
>  
> +Optional properties:
> +- max-pixel-clock: used to limit the maximal pixel clock if a board has lines,
> +	connectors or bridges not capable of carring higher frequencies
> +
>  Example:
>  
>  	hdmi {
> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
> index 2a18f4e..404f1b7 100644
> --- a/drivers/gpu/drm/exynos/exynos_hdmi.c
> +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
> @@ -195,6 +195,7 @@ struct hdmi_context {
>  	struct hdmi_resources		res;
>  
>  	int				hpd_gpio;
> +	u32				max_pixel_clock;
>  
>  	enum hdmi_type			type;
>  };
> @@ -887,6 +888,9 @@ static int hdmi_mode_valid(struct drm_connector *connector,
>  	if (ret)
>  		return MODE_BAD;
>  
> +	if (mode->clock * 1000 > hdata->max_pixel_clock)
> +		return MODE_BAD;
> +
This should be MODE_CLOCK_HIGH

Regards,
Lucas
-- 
Pengutronix e.K.             | Lucas Stach                 |
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