linux-kernel - [PATCH 5.16 076/164] drm/amd/display: For vblank_disable

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Date:   Mon, 28 Feb 2022 18:23:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Harry Wentland <harry.wentland@....com>,
        Michel Dänzer <mdaenzer@...hat.com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.16 076/164] drm/amd/display: For vblank_disable_immediate, check PSR is really used

From: Michel Dänzer <mdaenzer@...hat.com>

commit 4d22336f903930eb94588b939c310743a3640276 upstream.

Even if PSR is allowed for a present GPU, there might be no eDP link
which supports PSR.

Fixes: 708978487304 ("drm/amdgpu/display: Only set vblank_disable_immediate when PSR is not enabled")
Reviewed-by: Harry Wentland <harry.wentland@....com>
Signed-off-by: Michel Dänzer <mdaenzer@...hat.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4232,6 +4232,9 @@ static int amdgpu_dm_initialize_drm_devi
 	}
 #endif
 
+	/* Disable vblank IRQs aggressively for power-saving. */
+	adev_to_drm(adev)->vblank_disable_immediate = true;
+
 	/* loops over all connectors on the board */
 	for (i = 0; i < link_cnt; i++) {
 		struct dc_link *link = NULL;
@@ -4277,19 +4280,17 @@ static int amdgpu_dm_initialize_drm_devi
 				update_connector_ext_caps(aconnector);
 			if (psr_feature_enabled)
 				amdgpu_dm_set_psr_caps(link);
+
+			/* TODO: Fix vblank control helpers to delay PSR entry to allow this when
+			 * PSR is also supported.
+			 */
+			if (link->psr_settings.psr_feature_enabled)
+				adev_to_drm(adev)->vblank_disable_immediate = false;
 		}
 
 
 	}
 
-	/*
-	 * Disable vblank IRQs aggressively for power-saving.
-	 *
-	 * TODO: Fix vblank control helpers to delay PSR entry to allow this when PSR
-	 * is also supported.
-	 */
-	adev_to_drm(adev)->vblank_disable_immediate = !psr_feature_enabled;
-
 	/* Software is initialized. Now we can register interrupt handlers. */
 	switch (adev->asic_type) {
 #if defined(CONFIG_DRM_AMD_DC_SI)