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

Joe Perches
2018-12-05T15:53:32Z

On Wed, 2018-12-05 at 04:35 -0500, Sasha Levin wrote:
> From: "Y.C. Chen" <yc_chen@aspeedtech.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...