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From 7636da3653e5bbfc9241d99ece3956f7c6667285 Mon Sep 17 00:00:00 2001
From: Charlene Liu <charlene.liu@amd.com>
Date: Mon, 15 Apr 2019 16:17:59 -0400
Subject: [PATCH 2519/2940] drm/amd/display: add SW_USE_I2C_REG request.
[Description]
This is for DC_I2c arbitration use between HW use/SW use and DMCU use.
Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
index d658b862430a..b2786a704708 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
@@ -306,6 +306,8 @@ static bool setup_engine(
#if defined(CONFIG_DRM_AMD_DC_DCN2_0)
uint32_t reset_length = 0;
#endif
+ /* we have checked I2c not used by DMCU, set SW use I2C REQ to 1 to indicate SW using it*/
+ REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_USE_I2C_REG_REQ, 1);
/* we have checked I2c not used by DMCU, set SW use I2C REQ to 1 to indicate SW using it*/
REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_USE_I2C_REG_REQ, 1);
--
2.17.1
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