Re: [PATCH v2 13/13] drm/bridge: lt9611: properly program the dual host mode

[Neil Armstrong <neil.armstrong@linaro.org>]

On 08/01/2023 17:56, Dmitry Baryshkov wrote:
> If the bridge is connected using both DSI ports, the driver should use
> both of them all the time. Correct programming sequence to always use
> dual-port mode if both dsi0 and dsi1 are connected.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>   drivers/gpu/drm/bridge/lontium-lt9611.c | 28 ++++++++++++-------------
>   1 file changed, 13 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
> index df9f015aa3a0..561da6bd2698 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
> @@ -118,7 +118,7 @@ static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
>   		{ 0x8306, 0x0a },
>   	};
>   
> -	if (mode->hdisplay == 3840)
> +	if (lt9611->dsi1_node)
>   		reg_cfg[1].def = 0x03;
>   
>   	return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
> @@ -191,16 +191,6 @@ static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mod
>   		{ 0x832d, 0x38 },
>   		{ 0x8331, 0x08 },
>   	};
> -	const struct reg_sequence reg_cfg2[] = {
> -		{ 0x830b, 0x03 },
> -		{ 0x830c, 0xd0 },
> -		{ 0x8348, 0x03 },
> -		{ 0x8349, 0xe0 },
> -		{ 0x8324, 0x72 },
> -		{ 0x8325, 0x00 },
> -		{ 0x832a, 0x01 },
> -		{ 0x834a, 0x10 },
> -	};
>   	u8 pol = 0x10;
>   
>   	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> @@ -209,10 +199,18 @@ static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mod
>   		pol |= 0x1;
>   	regmap_write(lt9611->regmap, 0x831d, pol);
>   
> -	if (mode->hdisplay == 3840)
> -		regmap_multi_reg_write(lt9611->regmap, reg_cfg2, ARRAY_SIZE(reg_cfg2));
> -	else
> -		regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
> +	regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
> +	if (lt9611->dsi1_node) {
> +		unsigned int hact = mode->hdisplay;
> +
> +		hact >>= 2;
> +		hact += 0x50;
> +		hact = min(hact, 0x3e0U);
> +		regmap_write(lt9611->regmap, 0x830b, hact / 256);
> +		regmap_write(lt9611->regmap, 0x830c, hact % 256);
> +		regmap_write(lt9611->regmap, 0x8348, hact / 256);
> +		regmap_write(lt9611->regmap, 0x8349, hact % 256);
> +	}
>   
>   	regmap_write(lt9611->regmap, 0x8326, pcr_m);
>   

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>