[PATCH 11/14] drm/ast: Detect AST 1400 model

[Thomas Zimmermann]

Detect the 5th-generation AST 1400. Allows to simplify the code
for widescreen support.

Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
---
 drivers/gpu/drm/ast/ast_drv.h  |  2 +-
 drivers/gpu/drm/ast/ast_main.c | 14 ++++++++++----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index e3f82c7a823e4..ef69a1535695b 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -74,7 +74,7 @@ enum ast_chip {
        AST1050 = __AST_CHIP(4, 2), // unused
        /* 5th gen */
        AST2400 = __AST_CHIP(5, 0),
-       AST1400 = __AST_CHIP(5, 1), // unused
+       AST1400 = __AST_CHIP(5, 1),
        AST1250 = __AST_CHIP(5, 2), // unused
        /* 6th gen */
        AST2500 = __AST_CHIP(6, 0),
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index bf8606301ab26..72543e97f3586 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -167,8 +167,15 @@ static int ast_detect_chip(struct drm_device *dev, bool 
need_post, u32 scu_rev)
                ast->chip = AST2500;
                drm_info(dev, "AST 2500 detected\n");
        } else if (pdev->revision >= 0x30) {
-               ast->chip = AST2400;
-               drm_info(dev, "AST 2400 detected\n");
+               switch (scu_rev & 0x300) {
+               case 0x0100:
+                       ast->chip = AST1400;
+                       drm_info(dev, "AST 1400 detected\n");
+                       break;
+               default:
+                       ast->chip = AST2400;
+                       drm_info(dev, "AST 2400 detected\n");
+               }
        } else if (pdev->revision >= 0x20) {
                switch (scu_rev & 0x300) {
                case 0x0000:
@@ -219,8 +226,7 @@ static int ast_detect_chip(struct drm_device *dev, bool 
need_post, u32 scu_rev)
                        ast->support_wide_screen = false;
                        if (ast->chip == AST1300)
                                ast->support_wide_screen = true;
-                       if (ast->chip == AST2400 &&
-                           (scu_rev & 0x300) == 0x100) /* ast1400 */
+                       if (ast->chip == AST1400)
                                ast->support_wide_screen = true;
                        if (ast->chip == AST2500 &&
                            scu_rev == 0x100)           /* ast2510 */
-- 
2.41.0