linux-kernel - [PATCH AUTOSEL 5.1 027/141] drm/amd/display: Increase Backlight Gain Step Size

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Date:   Fri, 19 Jul 2019 00:00:52 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Eryk Brol <eryk.brol@....com>, Jun Lei <Jun.Lei@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.1 027/141] drm/amd/display: Increase Backlight Gain Step Size

From: Eryk Brol <eryk.brol@....com>

[ Upstream commit e25228b02e4833e5b0fdd262801a2ae6cc72b39d ]

[Why]
Some backlight tests fail due to backlight settling
taking too long. This happens because the step
size used to change backlight levels is too small.

[How]
1. Change the size of the backlight gain step size
2. Change how DMCU firmware gets the step size value
   so that it is passed in by driver during DMCU initn

Signed-off-by: Eryk Brol <eryk.brol@....com>
Reviewed-by: Jun Lei <Jun.Lei@....com>
Acked-by: Leo Li <sunpeng.li@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c | 3 +++
 drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.h | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c b/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c
index c2926cf19dee..407fb22be66a 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.c
@@ -365,6 +365,9 @@ static bool dcn10_dmcu_init(struct dmcu *dmcu)
 		/* Set initialized ramping boundary value */
 		REG_WRITE(MASTER_COMM_DATA_REG1, 0xFFFF);
 
+		/* Set backlight ramping stepsize */
+		REG_WRITE(MASTER_COMM_DATA_REG2, abm_gain_stepsize);
+
 		/* Set command to initialize microcontroller */
 		REG_UPDATE(MASTER_COMM_CMD_REG, MASTER_COMM_CMD_REG_BYTE0,
 			MCP_INIT_DMCU);
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.h b/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.h
index c24c0e5ea44e..249a3c23b607 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.h
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_dmcu.h
@@ -263,4 +263,6 @@ struct dmcu *dcn10_dmcu_create(
 
 void dce_dmcu_destroy(struct dmcu **dmcu);
 
+static const uint32_t abm_gain_stepsize = 0x0060;
+
 #endif /* _DCE_ABM_H_ */
-- 
2.20.1