linux-kernel - Re: [PATCH 6/9] drm/vc4: hdmi: Swap CSC matrix channels for YUV444

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Date:   Wed, 11 Jan 2023 16:05:09 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Maxime Ripard <maxime@...no.tech>, Emma Anholt <emma@...olt.net>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH 6/9] drm/vc4: hdmi: Swap CSC matrix channels for YUV444



Am 07.12.22 um 17:07 schrieb Maxime Ripard:
> From: Dave Stevenson <dave.stevenson@...pberrypi.com>
> 
> YUV444 requires the matrix coefficients to be programmed in a different
> way than the other formats. Let's add a function to program it properly.
> 
> Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>   drivers/gpu/drm/vc4/vc4_hdmi.c | 17 ++++++++++++++++-
>   1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 299a8fe7a2ae..cb92d07680f0 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -1259,6 +1259,20 @@ static void vc5_hdmi_set_csc_coeffs(struct vc4_hdmi *vc4_hdmi,
>   	HDMI_WRITE(HDMI_CSC_34_33, (coeffs[2][3] << 16) | coeffs[2][2]);
>   }
>   
> +static void vc5_hdmi_set_csc_coeffs_swap(struct vc4_hdmi *vc4_hdmi,
> +					 const u16 coeffs[3][4])
> +{
> +	lockdep_assert_held(&vc4_hdmi->hw_lock);
> +
> +	/* YUV444 needs the CSC matrices using the channels in a different order */
> +	HDMI_WRITE(HDMI_CSC_12_11, (coeffs[2][1] << 16) | coeffs[2][0]);
> +	HDMI_WRITE(HDMI_CSC_14_13, (coeffs[2][3] << 16) | coeffs[2][2]);
> +	HDMI_WRITE(HDMI_CSC_22_21, (coeffs[0][1] << 16) | coeffs[0][0]);
> +	HDMI_WRITE(HDMI_CSC_24_23, (coeffs[0][3] << 16) | coeffs[0][2]);
> +	HDMI_WRITE(HDMI_CSC_32_31, (coeffs[1][1] << 16) | coeffs[1][0]);
> +	HDMI_WRITE(HDMI_CSC_34_33, (coeffs[1][3] << 16) | coeffs[1][2]);
> +}
> +
>   static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
>   			       struct drm_connector_state *state,
>   			       const struct drm_display_mode *mode)
> @@ -1282,7 +1296,8 @@ static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
>   
>   	switch (vc4_state->output_format) {
>   	case VC4_HDMI_OUTPUT_YUV444:
> -		vc5_hdmi_set_csc_coeffs(vc4_hdmi, vc5_hdmi_csc_full_rgb_to_yuv_bt709[lim_range]);
> +		vc5_hdmi_set_csc_coeffs_swap(vc4_hdmi,
> +					     vc5_hdmi_csc_full_rgb_to_yuv_bt709[lim_range]);
>   		break;
>   
>   	case VC4_HDMI_OUTPUT_YUV422:
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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