drm/ast: Gen7: Disable VGASR0[1] as on Gen4+

Set VGACRB6[5], which disables asynchronous sequencer resets via
VGASR0[1]. This was most likely an oversight when adding support
for Gen7. Aligns Gen7 with the earlier Gen4+.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250706162816.211552-10-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/ast/ast_2600.c b/drivers/gpu/drm/ast/ast_2600.c
index 08614090068d4b22f2c7ba410d40ea999b08dae3..01fd0e2d96e115c57d754fce8768da37ebfd7ba1 100644 (file)
--- a/drivers/gpu/drm/ast/ast_2600.c
+++ b/drivers/gpu/drm/ast/ast_2600.c
@@ -60,6 +60,7 @@ void ast_2600_set_def_ext_reg(struct ast_device *ast)
 
        /* Enable RAMDAC for A1 */
        reg = 0x04;
+       reg |= 0x20;
        ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xb6, 0xff, reg);
 }