Hi Jernej,
Thank you for the patch.
On Thu, Mar 05, 2020 at 12:25:12AM +0100, Jernej Skrabec wrote:
> is_color_space_conversion() is a misnomer. It checks not only if color
> space conversion is needed, but also if format conversion is needed.
> This is actually desired behaviour because result of this function
> determines if CSC block should be enabled or not (CSC block can also do
> format conversion).
>
> In order to clear misunderstandings, let's rework
> is_color_space_conversion() to do exactly what is supposed to do and add
> another function which will determine if CSC block must be enabled or
> not.
>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxx>
> ---
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 31 +++++++++++++++--------
> 1 file changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index c8a02e5b5e1b..7724191e0a8b 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -963,11 +963,14 @@ static void hdmi_video_sample(struct dw_hdmi *hdmi)
>
> static int is_color_space_conversion(struct dw_hdmi *hdmi)
> {
> - return (hdmi->hdmi_data.enc_in_bus_format !=
> - hdmi->hdmi_data.enc_out_bus_format) ||
> - (hdmi_bus_fmt_is_rgb(hdmi->hdmi_data.enc_in_bus_format) &&
> - hdmi_bus_fmt_is_rgb(hdmi->hdmi_data.enc_out_bus_format) &&
> - hdmi->hdmi_data.rgb_limited_range);
> + struct hdmi_data_info *hdmi_data = &hdmi->hdmi_data;
> + bool is_input_rgb, is_output_rgb;
> +
> + is_input_rgb = hdmi_bus_fmt_is_rgb(hdmi_data->enc_in_bus_format);
> + is_output_rgb = hdmi_bus_fmt_is_rgb(hdmi_data->enc_out_bus_format);
> +
> + return (is_input_rgb != is_output_rgb) ||
> + (is_input_rgb && is_output_rgb && hdmi_data->rgb_limited_range);
> }
>
> static int is_color_space_decimation(struct dw_hdmi *hdmi)
> @@ -994,6 +997,13 @@ static int is_color_space_interpolation(struct dw_hdmi *hdmi)
> return 0;
> }
>
> +static bool is_conversion_needed(struct dw_hdmi *hdmi)
Maybe is_csc_needed ?
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> +{
> + return is_color_space_conversion(hdmi) ||
> + is_color_space_decimation(hdmi) ||
> + is_color_space_interpolation(hdmi);
> +}
> +
> static void dw_hdmi_update_csc_coeffs(struct dw_hdmi *hdmi)
> {
> const u16 (*csc_coeff)[3][4] = &csc_coeff_default;
> @@ -2014,18 +2024,19 @@ static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi)
> hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
>
> /* Enable csc path */
> - if (is_color_space_conversion(hdmi)) {
> + if (is_conversion_needed(hdmi)) {
> hdmi->mc_clkdis &= ~HDMI_MC_CLKDIS_CSCCLK_DISABLE;
> hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
> - }
>
> - /* Enable color space conversion if needed */
> - if (is_color_space_conversion(hdmi))
> hdmi_writeb(hdmi, HDMI_MC_FLOWCTRL_FEED_THROUGH_OFF_CSC_IN_PATH,
> HDMI_MC_FLOWCTRL);
> - else
> + } else {
> + hdmi->mc_clkdis |= HDMI_MC_CLKDIS_CSCCLK_DISABLE;
> + hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
> +
> hdmi_writeb(hdmi, HDMI_MC_FLOWCTRL_FEED_THROUGH_OFF_CSC_BYPASS,
> HDMI_MC_FLOWCTRL);
> + }
> }
>
> /* Workaround to clear the overflow condition */
--
Regards,
Laurent Pinchart
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