[PATCH 06/15] drm/ast: Add support_wuxga flag to struct ast_device

[Jocelyn Falempe]

On 24/01/2025 08:57, Thomas Zimmermann wrote:
> Detect support for 1920x1200 (WUXGA) in ast_detect_widescreen(). The
> flag is cleared by default. The test logic has been taken from existing
> code in ast_crtc_helper_mode_valid(). The code in that function is being
> replaced by the new flag.

I think adding a small helper would help here too:


static bool ast_vgacrd1_support_wuxga(struct ast_device *ast) {
     u8 vgacrd1;
     vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
     return !(vgacrd1 & AST_IO_VGACRD1_SUPPORTS_WUXGA);
}

Best regards,

-- 

Jocelyn


> 
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
> ---
>   drivers/gpu/drm/ast/ast_drv.h  |  1 +
>   drivers/gpu/drm/ast/ast_main.c | 31 ++++++++++++++++++++++++++++++-
>   drivers/gpu/drm/ast/ast_mode.c |  8 +++-----
>   drivers/gpu/drm/ast/ast_reg.h  |  1 +
>   4 files changed, 35 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
> index 01ef0c0d5db7d..4e3a88f8a85ca 100644
> --- a/drivers/gpu/drm/ast/ast_drv.h
> +++ b/drivers/gpu/drm/ast/ast_drv.h
> @@ -207,6 +207,7 @@ struct ast_device {
>   
>   	bool support_wsxga_p; /* 1680x1050 */
>   	bool support_fullhd; /* 1920x1080 */
> +	bool support_wuxga; /* 1920x1200 */
>   
>   	u8 *dp501_fw_addr;
>   	const struct firmware *dp501_fw;	/* dp501 fw */
> diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
> index e6237ba92cce3..1de6f1129e165 100644
> --- a/drivers/gpu/drm/ast/ast_main.c
> +++ b/drivers/gpu/drm/ast/ast_main.c
> @@ -38,14 +38,18 @@
>   
>   static void ast_detect_widescreen(struct ast_device *ast)
>   {
> -	u8 vgacrd0;
> +	u8 vgacrd0, vgacrd1;
>   
>   	ast->support_wsxga_p = false;
>   	ast->support_fullhd = false;
> +	ast->support_wuxga = false;
>   
>   	if (AST_GEN(ast) >= 7) {
>   		ast->support_wsxga_p = true;
>   		ast->support_fullhd = true;
> +		vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
> +		if (!(vgacrd1 & AST_IO_VGACRD1_SUPPORTS_WUXGA))
> +			ast->support_wuxga = true;
>   	} else if (AST_GEN(ast) >= 6) {
>   		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
>   		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
> @@ -56,6 +60,11 @@ static void ast_detect_widescreen(struct ast_device *ast)
>   			ast->support_wsxga_p = true;
>   		if (ast->support_wsxga_p)
>   			ast->support_fullhd = true;
> +		if (ast->support_fullhd) {
> +			vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
> +			if (!(vgacrd1 & AST_IO_VGACRD1_SUPPORTS_WUXGA))
> +				ast->support_wuxga = true;
> +		}
>   	} else if (AST_GEN(ast) >= 5) {
>   		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
>   		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
> @@ -66,6 +75,11 @@ static void ast_detect_widescreen(struct ast_device *ast)
>   			ast->support_wsxga_p = true;
>   		if (ast->support_wsxga_p)
>   			ast->support_fullhd = true;
> +		if (ast->support_fullhd) {
> +			vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
> +			if (!(vgacrd1 & AST_IO_VGACRD1_SUPPORTS_WUXGA))
> +				ast->support_wuxga = true;
> +		}
>   	} else if (AST_GEN(ast) >= 4) {
>   		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
>   		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
> @@ -76,6 +90,11 @@ static void ast_detect_widescreen(struct ast_device *ast)
>   			ast->support_wsxga_p = true;
>   		if (ast->support_wsxga_p)
>   			ast->support_fullhd = true;
> +		if (ast->support_fullhd) {
> +			vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
> +			if (!(vgacrd1 & AST_IO_VGACRD1_SUPPORTS_WUXGA))
> +				ast->support_wuxga = true;
> +		}
>   	} else if (AST_GEN(ast) >= 3) {
>   		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
>   		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
> @@ -86,6 +105,11 @@ static void ast_detect_widescreen(struct ast_device *ast)
>   			if (ast->chip == AST2200)
>   				ast->support_fullhd = true;
>   		}
> +		if (ast->support_fullhd) {
> +			vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
> +			if (!(vgacrd1 & AST_IO_VGACRD1_SUPPORTS_WUXGA))
> +				ast->support_wuxga = true;
> +		}
>   	} else if (AST_GEN(ast) >= 2) {
>   		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
>   		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
> @@ -96,6 +120,11 @@ static void ast_detect_widescreen(struct ast_device *ast)
>   			if (ast->chip == AST2100)
>   				ast->support_fullhd = true;
>   		}
> +		if (ast->support_fullhd) {
> +			vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
> +			if (!(vgacrd1 & AST_IO_VGACRD1_SUPPORTS_WUXGA))
> +				ast->support_wuxga = true;
> +		}
>   	}
>   }
>   
> diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
> index 594a58401cf66..fca625518a873 100644
> --- a/drivers/gpu/drm/ast/ast_mode.c
> +++ b/drivers/gpu/drm/ast/ast_mode.c
> @@ -1022,7 +1022,6 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
>   {
>   	struct ast_device *ast = to_ast_device(crtc->dev);
>   	enum drm_mode_status status;
> -	uint32_t jtemp;
>   
>   	if (ast->support_wsxga_p) {
>   		if ((mode->hdisplay == 1680) && (mode->vdisplay == 1050))
> @@ -1041,11 +1040,10 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
>   				return MODE_OK;
>   
>   			if ((mode->hdisplay == 1920) && (mode->vdisplay == 1200)) {
> -				jtemp = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xd1, 0xff);
> -				if (jtemp & 0x01)
> -					return MODE_NOMODE;
> -				else
> +				if (ast->support_wuxga)
>   					return MODE_OK;
> +				else
> +					return MODE_NOMODE;
>   			}
>   		}
>   	}
> diff --git a/drivers/gpu/drm/ast/ast_reg.h b/drivers/gpu/drm/ast/ast_reg.h
> index b4ff38949a565..9db0d584652a4 100644
> --- a/drivers/gpu/drm/ast/ast_reg.h
> +++ b/drivers/gpu/drm/ast/ast_reg.h
> @@ -55,6 +55,7 @@
>   #define AST_IO_VGACRD1_TX_ANX9807_VBIOS		0x0a
>   #define AST_IO_VGACRD1_TX_FW_EMBEDDED_FW	0x0c /* special case of DP501 */
>   #define AST_IO_VGACRD1_TX_ASTDP			0x0e
> +#define AST_IO_VGACRD1_SUPPORTS_WUXGA		BIT(0)
>   
>   #define AST_IO_VGACRD7_EDID_VALID_FLAG	BIT(0)
>   #define AST_IO_VGACRDC_LINK_SUCCESS	BIT(0)