[PATCH 05/15] drm/ast: Add support_fullhd flag to struct ast_device

[Thomas Zimmermann]

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.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/ast/ast_drv.h  |  1 +
 drivers/gpu/drm/ast/ast_main.c | 22 ++++++++++++++++++++++
 drivers/gpu/drm/ast/ast_mode.c |  5 +----
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index ec5b204be1dae..01ef0c0d5db7d 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -206,6 +206,7 @@ struct ast_device {
 	} output;
 
 	bool support_wsxga_p; /* 1680x1050 */
+	bool support_fullhd; /* 1920x1080 */
 
 	u8 *dp501_fw_addr;
 	const struct firmware *dp501_fw;	/* dp501 fw */
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index e1cfb2a1a5448..e6237ba92cce3 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -41,9 +41,11 @@ static void ast_detect_widescreen(struct ast_device *ast)
 	u8 vgacrd0;
 
 	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) {
 		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
 		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
@@ -52,6 +54,8 @@ static void ast_detect_widescreen(struct ast_device *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) {
 		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
 		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
@@ -60,6 +64,8 @@ static void ast_detect_widescreen(struct ast_device *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) {
 		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
 		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
@@ -68,12 +74,28 @@ static void ast_detect_widescreen(struct ast_device *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) {
+		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
+		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
+			ast->support_wsxga_p = true;
+		else if (vgacrd0 & AST_IO_VGACRD0_IKVM_WIDESCREEN)
+			ast->support_wsxga_p = true;
+		if (ast->support_wsxga_p) {
+			if (ast->chip == AST2200)
+				ast->support_fullhd = true;
+		}
 	} else if (AST_GEN(ast) >= 2) {
 		vgacrd0 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd0);
 		if (!(vgacrd0 & AST_IO_VGACRD0_VRAM_INIT_BY_BMC))
 			ast->support_wsxga_p = true;
 		else if (vgacrd0 & AST_IO_VGACRD0_IKVM_WIDESCREEN)
 			ast->support_wsxga_p = true;
+		if (ast->support_wsxga_p) {
+			if (ast->chip == AST2100)
+				ast->support_fullhd = true;
+		}
 	}
 }
 
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index d1b3136b37693..594a58401cf66 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -1036,10 +1036,7 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
 		if ((mode->hdisplay == 1600) && (mode->vdisplay == 900))
 			return MODE_OK;
 
-		if ((ast->chip == AST2100) || // GEN2, but not AST1100 (?)
-		    (ast->chip == AST2200) || // GEN3, but not AST2150 (?)
-		    IS_AST_GEN4(ast) || IS_AST_GEN5(ast) ||
-		    IS_AST_GEN6(ast) || IS_AST_GEN7(ast)) {
+		if (ast->support_fullhd) {
 			if ((mode->hdisplay == 1920) && (mode->vdisplay == 1080))
 				return MODE_OK;
 
-- 
2.47.1