linux-kernel - Re: [PATCH] drm/ast: Update the sequence of Clearing Fast-reset

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Message-ID: <fe524173-058a-1e6b-503a-6c2294e7594a@suse.de>
Date:   Thu, 21 Jan 2021 08:55:56 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     KuoHsiang Chou <kuohsiang_chou@...eedtech.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     airlied@...ux.ie, tommy_huang@...eedtech.com,
        jenmin_yuan@...eedtech.com, airlied@...hat.com,
        arc_sung@...eedtech.com
Subject: Re: [PATCH] drm/ast: Update the sequence of Clearing Fast-reset

Hi

Am 18.01.21 um 09:57 schrieb KuoHsiang Chou:
> [Bug][AST2500]
> If SCU00 is not unlocked, just enter its password again.
> It is unnecessary to clear AHB lock condition and restore WDT default
> setting again, before Fast-reset clearing.
> 
> Signed-off-by: KuoHsiang Chou <kuohsiang_chou@...eedtech.com>

Is this a separate issue? This patch looks like a fix for the previous 
patch. [1] Can you add this change to v3 of the other patch?

Best regards
Thomas

[1] 
https://lore.kernel.org/dri-devel/20210112075811.9354-1-kuohsiang_chou@aspeedtech.com/

> ---
>   drivers/gpu/drm/ast/ast_post.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ast/ast_post.c b/drivers/gpu/drm/ast/ast_post.c
> index 1f0007daa005..4f194c5fd2c2 100644
> --- a/drivers/gpu/drm/ast/ast_post.c
> +++ b/drivers/gpu/drm/ast/ast_post.c
> @@ -2030,7 +2030,6 @@ void ast_patch_ahb_2500(struct ast_private *ast)
>   {
>   	u32	data;
> 
> -patch_ahb_lock:
>   	/* Clear bus lock condition */
>   	ast_moutdwm(ast, 0x1e600000, 0xAEED1A03);
>   	ast_moutdwm(ast, 0x1e600084, 0x00010000);
> @@ -2044,11 +2043,9 @@ void ast_patch_ahb_2500(struct ast_private *ast)
>   		ast_moutdwm(ast, 0x1E78500c, 0x00000033);
>   		udelay(1000);
>   	}
> -	ast_moutdwm(ast, 0x1e6e2000, 0x1688A8A8);
>   	do {
> +		ast_moutdwm(ast, 0x1e6e2000, 0x1688A8A8);
>   		data = ast_mindwm(ast, 0x1e6e2000);
> -		if (data == 0xffffffff)
> -			goto patch_ahb_lock;
>   	}	while (data != 1);
>   	ast_moutdwm(ast, 0x1e6e207c, 0x08000000);	/* clear fast reset */
>   }
> --
> 2.18.4
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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