drm/i915/dg1: Fix power gate sequence.

JIRA: https://issues.redhat.com/browse/RHEL-53571
Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git (v6.12.9)

commit a0360b9
Author:     Rodrigo Vivi <rodrigo.vivi@intel.com>
AuthorDate: Thu Dec 19 16:00:19 2024 -0500
Commit:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CommitDate: Thu Jan  9 13:33:39 2025 +0100

    [ Upstream commit 20e7c53 ]

    sub-pipe PG is not present on DG1. Setting these bits can disable
    other power gates and cause GPU hangs on video playbacks.

    VLK: 16314, 4304

    Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/13381
    Fixes: 85a12d7 ("drm/i915/tgl: Fix Media power gate sequence.")
    Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
    Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
    Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
    Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20241219210019.70532-1-rodrigo.vivi@intel.com
    Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
    (cherry picked from commit de70619)
    Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
    Signed-off-by: Sasha Levin <sashal@kernel.org>

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>

Author: Jocelyn Falempe

drivers/gpu/drm/i915/gt/intel_rc6.c

@@ -133,7 +133,7 @@ static void gen11_rc6_enable(struct intel_rc6 *rc6)
 			GEN9_MEDIA_PG_ENABLE |
 			GEN11_MEDIA_SAMPLER_PG_ENABLE;
 
-	if (GRAPHICS_VER(gt->i915) >= 12) {
+	if (GRAPHICS_VER(gt->i915) >= 12 && !IS_DG1(gt->i915)) {
 		for (i = 0; i < I915_MAX_VCS; i++)
 			if (HAS_ENGINE(gt, _VCS(i)))
 				pg_enable |= (VDN_HCP_POWERGATE_ENABLE(i) |