drm/ast: Create threshold values for AST2600

The threshold value is used for AST2600 only.

Signed-off-by: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220117083643.41493-1-kuohsiang_chou@aspeedtech.com

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 44c2aaf..6fa8042 100644 (file)
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -471,7 +471,10 @@ static void ast_set_color_reg(struct ast_private *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);