drm/amd/display: Add i2c speed arbitration for dc_i2c and hdcp_i2c

[why]
HDCP 1.4 failed on SL8800 SW w/a test driver use.

[how]
Slow down the HW i2c speed when used by HW i2c.
This request: each acquired_i2c_engine setup the i2c speed needed
and sets the I2c engine for HDCP use at release_engine.

This covers SW using HW i2c engine and HDCP using HW i2c engine.
for dmcu using HW i2c engine, needs add similar logic in dmcu fw.
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Reviewed-by: Chris Park <Chris.Park@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc.h

@@ -152,6 +152,7 @@ struct dc_caps {
 	uint32_t max_planes;
 	uint32_t max_downscale_ratio;
 	uint32_t i2c_speed_in_khz;
+	uint32_t i2c_speed_in_khz_hdcp;
 	uint32_t dmdata_alloc_size;
 	unsigned int max_cursor_size;
 	unsigned int max_video_width;

drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c

@@ -299,8 +299,12 @@ static bool setup_engine(
 	/* 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);
 
+	/*set SW requested I2c speed to default, if API calls in it will be override later*/
+	set_speed(dce_i2c_hw, dce_i2c_hw->ctx->dc->caps.i2c_speed_in_khz);
+
 	if (dce_i2c_hw->setup_limit != 0)
 		i2c_setup_limit = dce_i2c_hw->setup_limit;
+
 	/* Program pin select */
 	REG_UPDATE_6(DC_I2C_CONTROL,
 		     DC_I2C_GO, 0,
@@ -339,8 +343,6 @@ static void release_engine(
 {
 	bool safe_to_reset;
 
-	/* Restore original HW engine speed */
-	set_speed(dce_i2c_hw, dce_i2c_hw->default_speed);
 
 	/* Reset HW engine */
 	{
@@ -360,6 +362,9 @@ static void release_engine(
 	/* HW I2c engine - clock gating feature */
 	if (!dce_i2c_hw->engine_keep_power_up_count)
 		REG_UPDATE_N(SETUP, 1, FN(SETUP, DC_I2C_DDC1_ENABLE), 0);
+
+	/*for HW HDCP Ri polling failure w/a test*/
+	set_speed(dce_i2c_hw, dce_i2c_hw->ctx->dc->caps.i2c_speed_in_khz_hdcp);
 	/* Release I2C after reset, so HW or DMCU could use it */
 	REG_UPDATE_2(DC_I2C_ARBITRATION, DC_I2C_SW_DONE_USING_I2C_REG, 1,
 		DC_I2C_SW_USE_I2C_REG_REQ, 0);

drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c

@@ -1071,6 +1071,7 @@ static bool dce100_resource_construct(
 	pool->base.timing_generator_count = pool->base.res_cap->num_timing_generator;
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 40;
+	dc->caps.i2c_speed_in_khz = 40;
 	dc->caps.max_cursor_size = 128;
 	dc->caps.dual_link_dvi = true;
 	dc->caps.disable_dp_clk_share = true;

drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c

@@ -1372,7 +1372,8 @@ static bool dce110_resource_construct(
 	pool->base.underlay_pipe_index = pool->base.pipe_count;
 	pool->base.timing_generator_count = pool->base.res_cap->num_timing_generator;
 	dc->caps.max_downscale_ratio = 150;
-	dc->caps.i2c_speed_in_khz = 100;
+	dc->caps.i2c_speed_in_khz = 40;
+	dc->caps.i2c_speed_in_khz_hdcp = 40;
 	dc->caps.max_cursor_size = 128;
 	dc->caps.is_apu = true;
 	dc->caps.extended_aux_timeout_support = false;

drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c

@@ -1240,6 +1240,7 @@ static bool dce112_resource_construct(
 	pool->base.timing_generator_count = pool->base.res_cap->num_timing_generator;
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 100;
+	dc->caps.i2c_speed_in_khz_hdcp = 100; /*1.4 w/a not applied by default*/
 	dc->caps.max_cursor_size = 128;
 	dc->caps.dual_link_dvi = true;
 	dc->caps.extended_aux_timeout_support = false;

drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c

@@ -1080,6 +1080,7 @@ static bool dce120_resource_construct(
 
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 100;
+	dc->caps.i2c_speed_in_khz_hdcp = 100; /*1.4 w/a not applied by default*/
 	dc->caps.max_cursor_size = 128;
 	dc->caps.dual_link_dvi = true;
 	dc->caps.psp_setup_panel_mode = true;

drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c

@@ -970,6 +970,7 @@ static bool dce80_construct(
 	pool->base.timing_generator_count = res_cap.num_timing_generator;
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 40;
+	dc->caps.i2c_speed_in_khz_hdcp = 40;
 	dc->caps.max_cursor_size = 128;
 	dc->caps.dual_link_dvi = true;
 	dc->caps.extended_aux_timeout_support = false;
@@ -1168,6 +1169,7 @@ static bool dce81_construct(
 	pool->base.timing_generator_count = res_cap_81.num_timing_generator;
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 40;
+	dc->caps.i2c_speed_in_khz_hdcp = 40;
 	dc->caps.max_cursor_size = 128;
 	dc->caps.is_apu = true;
 
@@ -1365,6 +1367,7 @@ static bool dce83_construct(
 	pool->base.timing_generator_count = res_cap_83.num_timing_generator;
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 40;
+	dc->caps.i2c_speed_in_khz_hdcp = 40;
 	dc->caps.max_cursor_size = 128;
 	dc->caps.is_apu = true;
 

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c

@@ -1416,6 +1416,7 @@ static bool dcn10_resource_construct(
 	dc->caps.max_video_width = 3840;
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 100;
+	dc->caps.i2c_speed_in_khz_hdcp = 100; /*1.4 w/a not applied by default*/
 	dc->caps.max_cursor_size = 256;
 	dc->caps.max_slave_planes = 1;
 	dc->caps.is_apu = true;

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -3801,6 +3801,7 @@ static bool dcn20_resource_construct(
 
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 100;
+	dc->caps.i2c_speed_in_khz_hdcp = 100; /*1.4 w/a not applied by default*/
 	dc->caps.max_cursor_size = 256;
 	dc->caps.dmdata_alloc_size = 2048;
 

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

@@ -1808,6 +1808,7 @@ static bool dcn21_resource_construct(
 
 	dc->caps.max_downscale_ratio = 200;
 	dc->caps.i2c_speed_in_khz = 100;
+	dc->caps.i2c_speed_in_khz_hdcp = 5; /*1.4 w/a applied by default*/
 	dc->caps.max_cursor_size = 256;
 	dc->caps.dmdata_alloc_size = 2048;
 

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c

@@ -2593,6 +2593,7 @@ static bool dcn30_resource_construct(
 	pool->base.mpcc_count = pool->base.res_cap->num_timing_generator;
 	dc->caps.max_downscale_ratio = 600;
 	dc->caps.i2c_speed_in_khz = 100;
+	dc->caps.i2c_speed_in_khz_hdcp = 100; /*1.4 w/a not applied by default*/
 	dc->caps.max_cursor_size = 256;
 	dc->caps.dmdata_alloc_size = 2048;