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@xxxxxxxxxxx>
> ---
> .../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 |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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