Gen7 only supports ASTDP. Gens 4 to 6 support various TX chips,
except ASTDP. These boards detect the TX chips by reading the SoC
scratch register as VGACRD1.
Gens 1 to 3 only support SIL164. These boards read the DVO bit from
VGACRA3. Hence move this test behind a branch, so that it does not
run on later generations.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/ast/ast_main.c | 30 +++++++++++++++---------------
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 474eb255b325b..50b57bc15d53c 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -96,21 +96,21 @@ static void ast_detect_tx_chip(struct ast_device *ast, bool need_post)
/* Check 3rd Tx option (digital output afaik) */
ast->tx_chip = AST_TX_NONE;
- /*
- * VGACRA3 Enhanced Color Mode Register, check if DVO is already
- * enabled, in that case, assume we have a SIL164 TMDS transmitter
- *
- * Don't make that assumption if we the chip wasn't enabled and
- * is at power-on reset, otherwise we'll incorrectly "detect" a
- * SIL164 when there is none.
- */
- if (!need_post) {
- jreg = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xa3, 0xff);
- if (jreg & 0x80)
- ast->tx_chip = AST_TX_SIL164;
- }
-
- if (IS_AST_GEN4(ast) || IS_AST_GEN5(ast) || IS_AST_GEN6(ast)) {
+ if (AST_GEN(ast) <= 3) {
+ /*
+ * VGACRA3 Enhanced Color Mode Register, check if DVO is already
+ * enabled, in that case, assume we have a SIL164 TMDS transmitter
+ *
+ * Don't make that assumption if we the chip wasn't enabled and
+ * is at power-on reset, otherwise we'll incorrectly "detect" a
+ * SIL164 when there is none.
+ */
+ if (!need_post) {
+ jreg = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xa3, 0xff);
+ if (jreg & 0x80)
+ ast->tx_chip = AST_TX_SIL164;
+ }
+ } else if (IS_AST_GEN4(ast) || IS_AST_GEN5(ast) || IS_AST_GEN6(ast)) {
/*
* On AST GEN4+, look the configuration set by the SoC in
* the SOC scratch register #1 bits 11:8 (interestingly marked
--
2.47.1
