From: KuoHsiang Chou <kuohsiang_chou@xxxxxxxxxxxxxx> commit bcc77411e8a65929655cef7b63a36000724cdc4b upstream. The threshold value is used for AST2600 only. Signed-off-by: KuoHsiang Chou <kuohsiang_chou@xxxxxxxxxxxxxx> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20220117083643.41493-1-kuohsiang_chou@xxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/ast/ast_mode.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/ast/ast_mode.c +++ b/drivers/gpu/drm/ast/ast_mode.c @@ -474,7 +474,10 @@ static void ast_set_color_reg(struct ast static void ast_set_crtthd_reg(struct ast_private *ast) { /* Set Threshold */ - if (ast->chip == AST2300 || ast->chip == AST2400 || + if (ast->chip == AST2600) { + ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0xe0); + ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0xa0); + } else if (ast->chip == AST2300 || ast->chip == AST2400 || ast->chip == AST2500) { ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0x78); ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0x60);
