linux-kernel - Re: [PATCH] drm/ast: Fix video broken in some resolutions on ast2600

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Date:   Tue, 20 Sep 2022 10:43:06 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Jammy Huang <jammy_huang@...eedtech.com>, airlied@...hat.com,
        airlied@...ux.ie, daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/ast: Fix video broken in some resolutions on ast2600

Hi

Am 16.09.22 um 11:17 schrieb Jammy Huang:
> Some cases are not handled well for ast2600.
> 
> Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>
> ---
>   drivers/gpu/drm/ast/ast_mode.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
> index d327dcbaf032..be9bbc888ac3 100644
> --- a/drivers/gpu/drm/ast/ast_mode.c
> +++ b/drivers/gpu/drm/ast/ast_mode.c
> @@ -314,7 +314,7 @@ static void ast_set_crtc_reg(struct ast_private *ast,
>   	u8 jreg05 = 0, jreg07 = 0, jreg09 = 0, jregAC = 0, jregAD = 0, jregAE = 0;
>   	u16 temp, precache = 0;
>   
> -	if ((ast->chip == AST2500) &&
> +	if ((ast->chip == AST2500 || ast->chip == AST2600) &&
>   	    (vbios_mode->enh_table->flags & AST2500PreCatchCRT))
>   		precache = 40;
>   
> @@ -355,6 +355,12 @@ static void ast_set_crtc_reg(struct ast_private *ast,
>   	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAC, 0x00, jregAC);
>   	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAD, 0x00, jregAD);
>   
> +	// Workaround for HSync Time non octave pixels (1920x1080@...z HSync 44 pixels);

Applied to drm-misc-next, but what is an 'octave pixel'?

Best regards
Thomas

> +	if ((ast->chip == AST2600) && (mode->crtc_vdisplay == 1080))
> +		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xFC, 0xFD, 0x02);
> +	else
> +		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xFC, 0xFD, 0x00);
> +
>   	/* vert timings */
>   	temp = (mode->crtc_vtotal) - 2;
>   	if (temp & 0x100)
> @@ -432,7 +438,7 @@ static void ast_set_dclk_reg(struct ast_private *ast,
>   {
>   	const struct ast_vbios_dclk_info *clk_info;
>   
> -	if (ast->chip == AST2500)
> +	if ((ast->chip == AST2500) || (ast->chip == AST2600))
>   		clk_info = &dclk_table_ast2500[vbios_mode->enh_table->dclk_index];
>   	else
>   		clk_info = &dclk_table[vbios_mode->enh_table->dclk_index];

-- 
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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