linux-kernel - Re: [PATCH AUTOSEL 4.19 100/123] drm/ast: fixed reading monitor EDID not stable issue

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Date:   Wed, 05 Dec 2018 07:53:27 -0800
From:   Joe Perches <joe@...ches.com>
To:     Sasha Levin <sashal@...nel.org>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "Y.C. Chen" <yc_chen@...eedtech.com>,
        Dave Airlie <airlied@...hat.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH AUTOSEL 4.19 100/123] drm/ast: fixed reading monitor
 EDID not stable issue

On Wed, 2018-12-05 at 04:35 -0500, Sasha Levin wrote:
> From: "Y.C. Chen" <yc_chen@...eedtech.com>
[]
> diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
[]
> @@ -973,9 +973,21 @@ static int get_clock(void *i2c_priv)
>  {
>  	struct ast_i2c_chan *i2c = i2c_priv;
>  	struct ast_private *ast = i2c->dev->dev_private;
> -	uint32_t val;
> +	uint32_t val, val2, count, pass;
> +
> +	count = 0;
> +	pass = 0;
> +	val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;
> +	do {
> +		val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;

These could have been simpler as bool using BIT

	val = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) & BIT(4);
	
etc...