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

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Date:   Tue, 20 Sep 2022 16:51:38 +0800
From:   Jammy Huang <jammy_huang@...eedtech.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        "airlied@...hat.com" <airlied@...hat.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/ast: Fix video broken in some resolutions on ast2600

Hi Thomas,

On 2022/9/20 下午 04:43, Thomas Zimmermann wrote:
> 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'?

It means to make the pixel number a multiple of 8.


>
> 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];
>
-- 
Best Regards
Jammy