linux-kernel - [PATCH 5.4 304/314] Revert "drm/amd/display: disable dcn20 abm feature for bring up"

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Date:   Tue, 23 Jun 2020 21:58:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexander Monakov <amonakov@...ras.ru>,
        Hersen Wu <hersenxs.wu@....com>,
        Anthony Koo <Anthony.Koo@....com>,
        Michael Chiu <Michael.Chiu@....com>,
        Harry Wentland <harry.wentland@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Subject: [PATCH 5.4 304/314] Revert "drm/amd/display: disable dcn20 abm feature for bring up"

From: Harry Wentland <harry.wentland@....com>

commit 14ed1c908a7a623cc0cbf0203f8201d1b7d31d16 upstream.

This reverts commit 96cb7cf13d8530099c256c053648ad576588c387.

This change was used for DCN2 bringup and is no longer desired.
In fact it breaks backlight on DCN2 systems.

Cc: Alexander Monakov <amonakov@...ras.ru>
Cc: Hersen Wu <hersenxs.wu@....com>
Cc: Anthony Koo <Anthony.Koo@....com>
Cc: Michael Chiu <Michael.Chiu@....com>
Signed-off-by: Harry Wentland <harry.wentland@....com>
Acked-by: Alex Deucher <alexander.deucher@....com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Reported-and-tested-by: Alexander Monakov <amonakov@...ras.ru>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   13 +++++--------
 1 file changed, 5 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
@@ -929,7 +929,7 @@ static int dm_late_init(void *handle)
 	unsigned int linear_lut[16];
 	int i;
 	struct dmcu *dmcu = adev->dm.dc->res_pool->dmcu;
-	bool ret = false;
+	bool ret;
 
 	for (i = 0; i < 16; i++)
 		linear_lut[i] = 0xFFFF * i / 15;
@@ -945,13 +945,10 @@ static int dm_late_init(void *handle)
 	 */
 	params.min_abm_backlight = 0x28F;
 
-	/* todo will enable for navi10 */
-	if (adev->asic_type <= CHIP_RAVEN) {
-		ret = dmcu_load_iram(dmcu, params);
-
-		if (!ret)
-			return -EINVAL;
-	}
+	ret = dmcu_load_iram(dmcu, params);
+
+	if (!ret)
+		return -EINVAL;
 
 	return detect_mst_link_for_all_connectors(adev->ddev);
 }