[PATCH 8/8] drm/ast: Only warn about unsupported TX chips on Gen4 and later

[Thomas Zimmermann <tzimmermann@suse.de>]

Only Gen4 and later read the installed TX chip from the SoC. So only
warn on those generations about unsupported chips.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/ast/ast_main.c | 40 +++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index b0d1b99ed532b..ba69280b33e78 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -78,21 +78,6 @@ static void ast_detect_tx_chip(struct ast_device *ast, bool need_post)
 	struct drm_device *dev = &ast->base;
 	u8 vgacra3, vgacrd1;
 
-	/*
-	 * Several of the listed TX chips are not explicitly supported
-	 * by the ast driver. If these exist in real-world devices, they
-	 * are most likely reported as VGA or SIL164 outputs. We warn here
-	 * to get bug reports for these devices. If none come in for some
-	 * time, we can begin to fail device probing on these values.
-	 */
-	vgacrd1 = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xd1, AST_IO_VGACRD1_TX_TYPE_MASK);
-	drm_WARN(dev, vgacrd1 == AST_IO_VGACRD1_TX_ITE66121_VBIOS,
-		 "ITE IT66121 detected, 0x%x, Gen%lu\n", vgacrd1, AST_GEN(ast));
-	drm_WARN(dev, vgacrd1 == AST_IO_VGACRD1_TX_CH7003_VBIOS,
-		 "Chrontel CH7003 detected, 0x%x, Gen%lu\n", vgacrd1, AST_GEN(ast));
-	drm_WARN(dev, vgacrd1 == AST_IO_VGACRD1_TX_ANX9807_VBIOS,
-		 "Analogix ANX9807 detected, 0x%x, Gen%lu\n", vgacrd1, AST_GEN(ast));
-
 	/* Check 3rd Tx option (digital output afaik) */
 	ast->tx_chip = AST_TX_NONE;
 
@@ -116,9 +101,9 @@ static void ast_detect_tx_chip(struct ast_device *ast, bool need_post)
 		 * the SOC scratch register #1 bits 11:8 (interestingly marked
 		 * as "reserved" in the spec)
 		 */
-		jreg = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xd1,
-					      AST_IO_VGACRD1_TX_TYPE_MASK);
-		switch (jreg) {
+		vgacrd1 = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xd1,
+						 AST_IO_VGACRD1_TX_TYPE_MASK);
+		switch (vgacrd1) {
 		/*
 		 * GEN4 to GEN6
 		 */
@@ -144,6 +129,25 @@ static void ast_detect_tx_chip(struct ast_device *ast, bool need_post)
 		case AST_IO_VGACRD1_TX_ASTDP:
 			ast->tx_chip = AST_TX_ASTDP;
 			break;
+		/*
+		 * Several of the listed TX chips are not explicitly supported
+		 * by the ast driver. If these exist in real-world devices, they
+		 * are most likely reported as VGA or SIL164 outputs. We warn here
+		 * to get bug reports for these devices. If none come in for some
+		 * time, we can begin to fail device probing on these values.
+		 */
+		case AST_IO_VGACRD1_TX_ITE66121_VBIOS:
+			drm_warn(dev, "ITE IT66121 detected, 0x%x, Gen%lu\n",
+				 vgacrd1, AST_GEN(ast));
+			break;
+		case AST_IO_VGACRD1_TX_CH7003_VBIOS:
+			drm_warn(dev, "Chrontel CH7003 detected, 0x%x, Gen%lu\n",
+				 vgacrd1, AST_GEN(ast));
+			break;
+		case AST_IO_VGACRD1_TX_ANX9807_VBIOS:
+			drm_warn(dev, "Analogix ANX9807 detected, 0x%x, Gen%lu\n",
+				 vgacrd1, AST_GEN(ast));
+			break;
 		}
 	}
 
-- 
2.47.1