drm/ast: Add support_fullhd flag to struct ast_device

Detect support for 1920x1080 (FullHD) in ast_detect_widescreen(). The
flag is cleared by default. The test logic has been taken from existing
code in ast_crtc_helper_mode_valid(). The code in that function is being
replaced by the new flag.

For Gen3, a new branch duplicates the Gen2 logic and adds a test for
AST2200. Gen2 adds a test for AST2100.

v2:
- use fullhd flag for setting max width/height

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250131092257.115596-6-tzimmermann@suse.de

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 93ae9a275c96..6e964a0714b4 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -52,27 +52,46 @@ static bool __ast_2100_detect_wsxga_p(struct ast_device *ast)
 static void ast_detect_widescreen(struct ast_device *ast)
 {
 	ast->support_wsxga_p = false;
+	ast->support_fullhd = false;
 
 	if (AST_GEN(ast) >= 7) {
 		ast->support_wsxga_p = true;
+		ast->support_fullhd = true;
 	} else if (AST_GEN(ast) >= 6) {
 		if (__ast_2100_detect_wsxga_p(ast))
 			ast->support_wsxga_p = true;
 		else if (ast->chip == AST2510)
 			ast->support_wsxga_p = true;
+		if (ast->support_wsxga_p)
+			ast->support_fullhd = true;
 	} else if (AST_GEN(ast) >= 5) {
 		if (__ast_2100_detect_wsxga_p(ast))
 			ast->support_wsxga_p = true;
 		else if (ast->chip == AST1400)
 			ast->support_wsxga_p = true;
+		if (ast->support_wsxga_p)
+			ast->support_fullhd = true;
 	} else if (AST_GEN(ast) >= 4) {
 		if (__ast_2100_detect_wsxga_p(ast))
 			ast->support_wsxga_p = true;
 		else if (ast->chip == AST1300)
 			ast->support_wsxga_p = true;
+		if (ast->support_wsxga_p)
+			ast->support_fullhd = true;
+	} else if (AST_GEN(ast) >= 3) {
+		if (__ast_2100_detect_wsxga_p(ast))
+			ast->support_wsxga_p = true;
+		if (ast->support_wsxga_p) {
+			if (ast->chip == AST2200)
+				ast->support_fullhd = true;
+		}
 	} else if (AST_GEN(ast) >= 2) {
 		if (__ast_2100_detect_wsxga_p(ast))
 			ast->support_wsxga_p = true;
+		if (ast->support_wsxga_p) {
+			if (ast->chip == AST2100)
+				ast->support_fullhd = true;
+		}
 	}
 }