linux-kernel - Re: [PATCH] drm/ast: Fix no display at WayLand after power-off

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Date:   Mon, 12 Dec 2022 11:16:46 +0800
From:   Jammy Huang <jammy_huang@...eedtech.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>, <airlied@...hat.com>,
        <airlied@...il.com>, <daniel@...ll.ch>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/ast: Fix no display at WayLand after power-off

Hi Thomas,


OK. Thanks for the reminder.


On 2022/12/9 下午 05:45, Thomas Zimmermann wrote:
> Hi
>
> Am 09.12.22 um 10:11 schrieb Jammy Huang:
>> With WayLand, there is error log when display waken up from power-off:
>> gnome-shell: Failed to post KMS update: CRTC property (GAMMA_LUT) not 
>> found
>> gnome-shell: Page flip discarded: CRTC property (GAMMA_LUT) not found
>>
>> To fix the issue, enable GAMMA_LUT property on CRTC.
>
> This code has long been replaced by commit ce7fcf700386 ("drm/ast: Add 
> Atomic gamma lut support for aspeed"), which adds proper color 
> management to ast.
>
> Please only submit patches for the latest driver in drm-misc-next.
>
> Best regards
> Thomas
>
>>
>> Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>
>> ---
>>   drivers/gpu/drm/ast/ast_drv.h  | 2 ++
>>   drivers/gpu/drm/ast/ast_mode.c | 5 +++--
>>   2 files changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/ast/ast_drv.h 
>> b/drivers/gpu/drm/ast/ast_drv.h
>> index 2e44b971c3a6..fd9af1cf0563 100644
>> --- a/drivers/gpu/drm/ast/ast_drv.h
>> +++ b/drivers/gpu/drm/ast/ast_drv.h
>> @@ -86,6 +86,8 @@ enum ast_tx_chip {
>>   #define AST_DRAM_4Gx16   7
>>   #define AST_DRAM_8Gx16   8
>>   +#define MAX_COLOR_LUT_ENTRIES 256
>> +
>>   /*
>>    * Cursor plane
>>    */
>> diff --git a/drivers/gpu/drm/ast/ast_mode.c 
>> b/drivers/gpu/drm/ast/ast_mode.c
>> index 1bc0220e6783..87bd9697bb44 100644
>> --- a/drivers/gpu/drm/ast/ast_mode.c
>> +++ b/drivers/gpu/drm/ast/ast_mode.c
>> @@ -74,7 +74,7 @@ static void ast_crtc_load_lut(struct ast_private 
>> *ast, struct drm_crtc *crtc)
>>       g = r + crtc->gamma_size;
>>       b = g + crtc->gamma_size;
>>   -    for (i = 0; i < 256; i++)
>> +    for (i = 0; i < MAX_COLOR_LUT_ENTRIES; i++)
>>           ast_load_palette_index(ast, i, *r++ >> 8, *g++ >> 8, *b++ 
>> >> 8);
>>   }
>>   @@ -1323,7 +1323,8 @@ static int ast_crtc_init(struct drm_device *dev)
>>       if (ret)
>>           return ret;
>>   -    drm_mode_crtc_set_gamma_size(crtc, 256);
>> +    drm_crtc_enable_color_mgmt(crtc, 0, false, MAX_COLOR_LUT_ENTRIES);
>> +    drm_mode_crtc_set_gamma_size(crtc, MAX_COLOR_LUT_ENTRIES);
>>       drm_crtc_helper_add(crtc, &ast_crtc_helper_funcs);
>>         return 0;
>>
>> base-commit: 8ed710da2873c2aeb3bb805864a699affaf1d03b
>
-- 
Best Regards
Jammy