drm/ast: Remove dead else branch in POST code

According to the chip detection in ast_detect_chip(), AST2300 and
later always have a PCI revision of 0x20 or higher. Therefore the
code in ast_set_def_ext_reg() can not use the else branch when
selecing the EXT register values. Remove the dead branch and the
related values.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Jocelyn Falempe <jfalempe@redhat.com> # AST2600
Link: https://patchwork.freedesktop.org/patch/msgid/20230621130032.3568-5-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/ast/ast_post.c b/drivers/gpu/drm/ast/ast_post.c
index 0262aaafdb1c55c5dd84efd346918369b64267ac..aa3f2cb00f82c57380fb5e791c8b9575acc3a02c 100644 (file)
--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -64,14 +64,12 @@ bool ast_is_vga_enabled(struct drm_device *dev)
 }
 
 static const u8 extreginfo[] = { 0x0f, 0x04, 0x1c, 0xff };
-static const u8 extreginfo_ast2300a0[] = { 0x0f, 0x04, 0x1c, 0xff };
 static const u8 extreginfo_ast2300[] = { 0x0f, 0x04, 0x1f, 0xff };
 
 static void
 ast_set_def_ext_reg(struct drm_device *dev)
 {
        struct ast_device *ast = to_ast_device(dev);
-       struct pci_dev *pdev = to_pci_dev(dev->dev);
        u8 i, index, reg;
        const u8 *ext_reg_info;
 
@@ -79,13 +77,9 @@ ast_set_def_ext_reg(struct drm_device *dev)
        for (i = 0x81; i <= 0x9f; i++)
                ast_set_index_reg(ast, AST_IO_CRTC_PORT, i, 0x00);
 
-       if (ast->chip == AST2300 || ast->chip == AST2400 ||
-           ast->chip == AST2500) {
-               if (pdev->revision >= 0x20)
-                       ext_reg_info = extreginfo_ast2300;
-               else
-                       ext_reg_info = extreginfo_ast2300a0;
-       } else
+       if (ast->chip == AST2300 || ast->chip == AST2400 || ast->chip == AST2500)
+               ext_reg_info = extreginfo_ast2300;
+       else
                ext_reg_info = extreginfo;
 
        index = 0xa0;