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Commit a32a7708 authored by Tony Cheng's avatar Tony Cheng Committed by Alex Deucher
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drm/amd/display: add option to disable DCC for DCC 128b request 



1. reverts commit e67f51012740 ("dc: temp disable DCC on high res.")
- default still DCC enabled

2. add debug options to decide how DCC is disabled
- disable DCC
- disable DCC if DCC requires 128b (aka. half) request
-- observed compressed data corruption result in screen corruption in
full (256b) request while half (128b) would cause DCN to hang, result in
DF hang

Signed-off-by: default avatarTony Cheng <tony.cheng@amd.com>
Reviewed-by: default avatarYongqiang Sun <yongqiang.sun@amd.com>
Acked-by: default avatarHarry Wentland <Harry.Wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent db64fbe7

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

+8 −3
Original line number Diff line number Diff line
@@ -56,11 +56,10 @@ struct dc_caps { 
	uint32_t max_planes;

	uint32_t max_downscale_ratio;

	uint32_t i2c_speed_in_khz;



	unsigned int max_cursor_size;

	bool dcc_const_color;

};





struct dc_dcc_surface_param {

	struct dc_size surface_size;

	enum surface_pixel_format format;
@@ -162,6 +161,12 @@ struct dc_config { 
	bool disable_disp_pll_sharing;

};



enum dcc_option {

	DCC_ENABLE = 0,

	DCC_DISABLE = 1,

	DCC_HALF_REQ_DISALBE = 2,

};



enum pipe_split_policy {

	MPC_SPLIT_DYNAMIC = 0,

	MPC_SPLIT_AVOID = 1,
@@ -177,7 +182,7 @@ struct dc_debug { 
	bool clock_trace;

	bool validation_trace;

	bool disable_stutter;

	bool disable_dcc;

	enum dcc_option disable_dcc;

	bool disable_dfs_bypass;

	bool disable_dpp_power_gate;

	bool disable_hubp_power_gate;

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

+8 −10
Original line number Diff line number Diff line
@@ -414,7 +414,6 @@ static const struct resource_caps res_cap = { 
};



static const struct dc_debug debug_defaults_drv = {

		.disable_dcc = false,

		.sanity_checks = true,

		.disable_dmcu = true,

		.force_abm_enable = false,
@@ -428,6 +427,7 @@ static const struct dc_debug debug_defaults_drv = { 
		.use_dml_wm = false,



		.pipe_split_policy = MPC_SPLIT_AVOID_MULT_DISP,

		.disable_dcc = DCC_ENABLE,

};



static const struct dc_debug debug_defaults_diags = {
@@ -1080,7 +1080,7 @@ static bool get_dcc_compression_cap(const struct dc *dc, 


	memset(output, 0, sizeof(*output));



	if (dc->debug.disable_dcc)

	if (dc->debug.disable_dcc == DCC_DISABLE)

		return false;



	if (!dcc_support_pixel_format(input->format,
@@ -1124,32 +1124,30 @@ static bool get_dcc_compression_cap(const struct dc *dc, 
			dcc_control = dcc_control__128_128_xxx;

	}



	if (dc->debug.disable_dcc == DCC_HALF_REQ_DISALBE &&

		dcc_control != dcc_control__256_256_xxx)

		return false;



	switch (dcc_control) {

	case dcc_control__256_256_xxx:

		output->grph.rgb.max_uncompressed_blk_size = 256;

		output->grph.rgb.max_compressed_blk_size = 256;

		output->grph.rgb.independent_64b_blks = false;

		output->capable = true;

		output->const_color_support = false;

		break;

	case dcc_control__128_128_xxx:

		output->grph.rgb.max_uncompressed_blk_size = 128;

		output->grph.rgb.max_compressed_blk_size = 128;

		output->grph.rgb.independent_64b_blks = false;

		/*temp: not allow dcc on high res*/

		output->capable = false;

		output->const_color_support = false;

		break;

	case dcc_control__256_64_64:

		output->grph.rgb.max_uncompressed_blk_size = 256;

		output->grph.rgb.max_compressed_blk_size = 64;

		output->grph.rgb.independent_64b_blks = true;

		/*temp: not allow dcc on high res*/

		output->capable = false;

		output->const_color_support = false;

		break;

	}



	output->capable = true;

	output->const_color_support = false;



	return true;

}