drm/amd/display: add oem i2c implemenation in dc

[why]
Need it for some OEM I2C devices in Nv10

[how]
Link up code to parse OEM table and expose DC interface
to access the pins

Signed-off-by: Jun Lei <[e-mail]>
Reviewed-by: Aric Cyr <[e-mail]>
Acked-by: Bhawanpreet Lakha <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c

···
 	struct atom_display_object_path_v2 *object;
 	struct atom_common_record_header *header;
 	struct atom_i2c_record *record;
+	struct atom_i2c_record dummy_record = {0};
 	struct bios_parser *bp = BP_FROM_DCB(dcb);
 
 	if (!info)
 		return BP_RESULT_BADINPUT;
+
+	if (id.type == OBJECT_TYPE_GENERIC) {
+		dummy_record.i2c_id = id.id;
+
+		if (get_gpio_i2c_info(bp, &dummy_record, info) == BP_RESULT_OK)
+			return BP_RESULT_OK;
+		else
+			return BP_RESULT_NORECORD;
+	}
 
 	object = get_bios_object(bp, id);
 
···
 	struct atom_gpio_pin_lut_v2_1 *header;
 	uint32_t count = 0;
 	unsigned int table_index = 0;
+	bool find_valid = false;
 
 	if (!info)
 		return BP_RESULT_BADINPUT;
···
 			- sizeof(struct atom_common_table_header))
 				/ sizeof(struct atom_gpio_pin_assignment);
 
-	table_index = record->i2c_id  & I2C_HW_LANE_MUX;
-
-	if (count < table_index) {
-		bool find_valid = false;
-
-		for (table_index = 0; table_index < count; table_index++) {
-			if (((record->i2c_id & I2C_HW_CAP) == (
-			header->gpio_pin[table_index].gpio_id &
-							I2C_HW_CAP)) &&
-			((record->i2c_id & I2C_HW_ENGINE_ID_MASK)  ==
-			(header->gpio_pin[table_index].gpio_id &
-						I2C_HW_ENGINE_ID_MASK)) &&
-			((record->i2c_id & I2C_HW_LANE_MUX) ==
-			(header->gpio_pin[table_index].gpio_id &
-							I2C_HW_LANE_MUX))) {
-				/* still valid */
-				find_valid = true;
-				break;
-			}
+	for (table_index = 0; table_index < count; table_index++) {
+		if (((record->i2c_id & I2C_HW_CAP) == (
+		header->gpio_pin[table_index].gpio_id &
+						I2C_HW_CAP)) &&
+		((record->i2c_id & I2C_HW_ENGINE_ID_MASK)  ==
+		(header->gpio_pin[table_index].gpio_id &
+					I2C_HW_ENGINE_ID_MASK)) &&
+		((record->i2c_id & I2C_HW_LANE_MUX) ==
+		(header->gpio_pin[table_index].gpio_id &
+						I2C_HW_LANE_MUX))) {
+			/* still valid */
+			find_valid = true;
+			break;
 		}
-		/* If we don't find the entry that we are looking for then
-		 *  we will return BP_Result_BadBiosTable.
-		 */
-		if (find_valid == false)
-			return BP_RESULT_BADBIOSTABLE;
 	}
+
+	/* If we don't find the entry that we are looking for then
+	 *  we will return BP_Result_BadBiosTable.
+	 */
+	if (find_valid == false)
+		return BP_RESULT_BADBIOSTABLE;
 
 	/* get the GPIO_I2C_INFO */
 	info->i2c_hw_assist = (record->i2c_id & I2C_HW_CAP) ? true : false;
···
 				bp->cmd_tbl.get_smu_clock_info(bp, SMU9_SYSPLL0_ID) * 10;
 	}
 
+	info->oem_i2c_present = false;
+
 	return BP_RESULT_OK;
 }
 
···
 		else if (revision.minor == 3)
 			info->smu_gpu_pll_output_freq =
 					bp->cmd_tbl.get_smu_clock_info(bp, SMU11_SYSPLL3_0_ID) * 10;
+	}
+
+	if (firmware_info->board_i2c_feature_id == 0x2) {
+		info->oem_i2c_present = true;
+		info->oem_i2c_obj_id = firmware_info->board_i2c_feature_gpio_id;
+	} else {
+		info->oem_i2c_present = false;
 	}
 
 	return BP_RESULT_OK;

drivers/gpu/drm/amd/display/dc/core/dc.c

···
 		cmd);
 }
 
+bool dc_submit_i2c_oem(
+		struct dc *dc,
+		struct i2c_command *cmd)
+{
+	struct ddc_service *ddc = dc->res_pool->oem_device;
+	return dce_i2c_submit_command(
+		dc->res_pool,
+		ddc->ddc_pin,
+		cmd);
+}
+
 static bool link_add_remote_sink_helper(struct dc_link *dc_link, struct dc_sink *sink)
 {
 	if (dc_link->sink_count >= MAX_SINKS_PER_LINK) {

drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c

···
 		ddc_service->ddc_pin = NULL;
 	} else {
 		hw_info.ddc_channel = i2c_info.i2c_line;
-		hw_info.hw_supported = i2c_info.i2c_hw_assist;
+		if (ddc_service->link != NULL)
+			hw_info.hw_supported = i2c_info.i2c_hw_assist;
+		else
+			hw_info.hw_supported = false;
 
 		ddc_service->ddc_pin = dal_gpio_create_ddc(
 			gpio_service,

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

···
 		uint32_t link_index,
 		struct i2c_command *cmd);
 
+bool dc_submit_i2c_oem(
+		struct dc *dc,
+		struct i2c_command *cmd);
+
 uint32_t dc_bandwidth_in_kbps_from_timing(
 	const struct dc_crtc_timing *timing);
 #endif /* DC_LINK_H_ */

drivers/gpu/drm/amd/display/dc/dce/dce_i2c.c

···
 	struct i2c_command *cmd)
 {
 	struct dce_i2c_hw *dce_i2c_hw;
-	struct dce_i2c_sw *dce_i2c_sw;
+	struct dce_i2c_sw dce_i2c_sw = {0};
 
 	if (!ddc) {
 		BREAK_TO_DEBUGGER();
···
 		return false;
 	}
 
-	/* The software engine is only available on dce8 */
-	dce_i2c_sw = dce_i2c_acquire_i2c_sw_engine(pool, ddc);
+	dce_i2c_hw = acquire_i2c_hw_engine(pool, ddc);
 
-	if (!dce_i2c_sw) {
-		dce_i2c_hw = acquire_i2c_hw_engine(pool, ddc);
-
-		if (!dce_i2c_hw)
-			return false;
-
+	if (dce_i2c_hw)
 		return dce_i2c_submit_command_hw(pool, ddc, cmd, dce_i2c_hw);
+
+	dce_i2c_sw.ctx = ddc->ctx;
+	if (dce_i2c_engine_acquire_sw(&dce_i2c_sw, ddc)) {
+		return dce_i2c_submit_command_sw(pool, ddc, cmd, &dce_i2c_sw);
 	}
 
-	return dce_i2c_submit_command_sw(pool, ddc, cmd, dce_i2c_sw);
-
+	return false;
 }

drivers/gpu/drm/amd/display/dc/dce/dce_i2c_sw.c

···
 	dce_i2c_sw->ddc = NULL;
 }
 
-static bool get_hw_supported_ddc_line(
-	struct ddc *ddc,
-	enum gpio_ddc_line *line)
-{
-	enum gpio_ddc_line line_found;
-
-	*line = GPIO_DDC_LINE_UNKNOWN;
-
-	if (!ddc) {
-		BREAK_TO_DEBUGGER();
-		return false;
-	}
-
-	if (!ddc->hw_info.hw_supported)
-		return false;
-
-	line_found = dal_ddc_get_line(ddc);
-
-	if (line_found >= GPIO_DDC_LINE_COUNT)
-		return false;
-
-	*line = line_found;
-
-	return true;
-}
 static bool wait_for_scl_high_sw(
 	struct dc_context *ctx,
 	struct ddc *ddc,
···
 	release_engine_dce_sw(pool, dce_i2c_sw);
 
 	return result;
-}
-struct dce_i2c_sw *dce_i2c_acquire_i2c_sw_engine(
-	struct resource_pool *pool,
-	struct ddc *ddc)
-{
-	enum gpio_ddc_line line;
-	struct dce_i2c_sw *engine = NULL;
-
-	if (get_hw_supported_ddc_line(ddc, &line))
-		engine = pool->sw_i2cs[line];
-
-	if (!engine)
-		return NULL;
-
-	if (!dce_i2c_engine_acquire_sw(engine, ddc))
-		return NULL;
-
-	return engine;
 }

drivers/gpu/drm/amd/display/dc/dce/dce_i2c_sw.h

···
 	struct i2c_command *cmd,
 	struct dce_i2c_sw *dce_i2c_sw);
 
-struct dce_i2c_sw *dce_i2c_acquire_i2c_sw_engine(
-	struct resource_pool *pool,
-	struct ddc *ddc);
+bool dce_i2c_engine_acquire_sw(
+	struct dce_i2c_sw *dce_i2c_sw,
+	struct ddc *ddc_handle);
 
 #endif
 

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

···
 #include "dml/display_mode_vba.h"
 #include "dcn20_dccg.h"
 #include "dcn20_vmid.h"
+#include "dc_link_ddc.h"
 
 #include "navi10_ip_offset.h"
 
···
 	if (pool->base.pp_smu != NULL)
 		dcn20_pp_smu_destroy(&pool->base.pp_smu);
 
+	if (pool->base.oem_device != NULL)
+		dal_ddc_service_destroy(&pool->base.oem_device);
 }
 
 struct hubp *dcn20_hubp_create(
···
 	int i;
 	struct dc_context *ctx = dc->ctx;
 	struct irq_service_init_data init_data;
+	struct ddc_service_init_data ddc_init_data;
 	struct _vcs_dpi_soc_bounding_box_st *loaded_bb =
 			get_asic_rev_soc_bb(ctx->asic_id.hw_internal_rev);
 	struct _vcs_dpi_ip_params_st *loaded_ip =
···
 		dc->caps.planes[i] = plane_cap;
 
 	dc->cap_funcs = cap_funcs;
+
+	if (dc->ctx->dc_bios->fw_info.oem_i2c_present) {
+		ddc_init_data.ctx = dc->ctx;
+		ddc_init_data.link = NULL;
+		ddc_init_data.id.id = dc->ctx->dc_bios->fw_info.oem_i2c_obj_id;
+		ddc_init_data.id.enum_id = 0;
+		ddc_init_data.id.type = OBJECT_TYPE_GENERIC;
+		pool->base.oem_device = dal_ddc_service_create(&ddc_init_data);
+	} else {
+		pool->base.oem_device = NULL;
+	}
 
 	return true;
 

drivers/gpu/drm/amd/display/dc/gpio/dcn20/hw_factory_dcn20.c

···
 	ddc_data_regs_dcn2(4),
 	ddc_data_regs_dcn2(5),
 	ddc_data_regs_dcn2(6),
+	{
+			DDC_GPIO_VGA_REG_LIST(DATA),
+			.ddc_setup = 0,
+			.phy_aux_cntl = 0,
+			.dc_gpio_aux_ctrl_5 = 0
+	}
 };
 
 static const struct ddc_registers ddc_clk_regs_dcn[] = {
···
 	ddc_clk_regs_dcn2(4),
 	ddc_clk_regs_dcn2(5),
 	ddc_clk_regs_dcn2(6),
+	{
+			DDC_GPIO_VGA_REG_LIST(CLK),
+			.ddc_setup = 0,
+			.phy_aux_cntl = 0,
+			.dc_gpio_aux_ctrl_5 = 0
+	}
 };
 
 static const struct ddc_sh_mask ddc_shift[] = {

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

···
 
 	const struct resource_funcs *funcs;
 	const struct resource_caps *res_cap;
+
+	struct ddc_service *oem_device;
 };
 
 struct dcn_fe_bandwidth {

drivers/gpu/drm/amd/display/include/grph_object_ctrl_defs.h

···
 	uint32_t default_engine_clk; /* in KHz */
 	uint32_t dp_phy_ref_clk; /* in KHz - DCE12 only */
 	uint32_t i2c_engine_ref_clk; /* in KHz - DCE12 only */
-
+	bool oem_i2c_present;
+	uint8_t oem_i2c_obj_id;
 
 };