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

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/dce/dce_transform.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/dce/dce_transform.c
Extension
.c
Size
48105 bytes
Lines
1700
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (coeffs_v != xfm_dce->filter_v || coeffs_h != xfm_dce->filter_h) {
			/* 4. Program vertical filters */
			if (xfm_dce->filter_v == NULL)
				REG_SET(SCL_VERT_FILTER_CONTROL, 0,
						SCL_V_2TAP_HARDCODE_COEF_EN, 0);
			program_multi_taps_filter(
					xfm_dce,
					data->taps.v_taps,
					coeffs_v,
					FILTER_TYPE_RGB_Y_VERTICAL);
			program_multi_taps_filter(
					xfm_dce,
					data->taps.v_taps,
					coeffs_v,
					FILTER_TYPE_ALPHA_VERTICAL);

			/* 5. Program horizontal filters */
			if (xfm_dce->filter_h == NULL)
				REG_SET(SCL_HORZ_FILTER_CONTROL, 0,
						SCL_H_2TAP_HARDCODE_COEF_EN, 0);
			program_multi_taps_filter(
					xfm_dce,
					data->taps.h_taps,
					coeffs_h,
					FILTER_TYPE_RGB_Y_HORIZONTAL);
			program_multi_taps_filter(
					xfm_dce,
					data->taps.h_taps,
					coeffs_h,
					FILTER_TYPE_ALPHA_HORIZONTAL);

			xfm_dce->filter_v = coeffs_v;
			xfm_dce->filter_h = coeffs_h;
			filter_updated = true;
		}
	}

	/* 6. Program the viewport */
	program_viewport(xfm_dce, &data->viewport);

	/* 7. Set bit to flip to new coefficient memory */
	if (filter_updated)
		REG_UPDATE(SCL_UPDATE, SCL_COEF_UPDATE_COMPLETE, 1);

	REG_UPDATE(LB_DATA_FORMAT, ALPHA_EN, data->lb_params.alpha_en);
}

#if defined(CONFIG_DRM_AMD_DC_SI)
static void dce60_transform_set_scaler(
	struct transform *xfm,
	const struct scaler_data *data)
{
	struct dce_transform *xfm_dce = TO_DCE_TRANSFORM(xfm);
	bool is_scaling_required;
	const uint16_t *coeffs_v, *coeffs_h;

	/*Use whole line buffer memory always*/
	REG_SET(DC_LB_MEMORY_SPLIT, 0,
		DC_LB_MEMORY_CONFIG, 0);

	REG_SET(DC_LB_MEM_SIZE, 0,
		DC_LB_MEM_SIZE, xfm_dce->lb_memory_size);

	REG_WRITE(SCL_UPDATE, 0x00010000);

	/* Clear SCL_F_SHARP_CONTROL value to 0 */
	REG_WRITE(SCL_F_SHARP_CONTROL, 0);

	/* 1. Program overscan */
	program_overscan(xfm_dce, data);

	/* 2. Program taps and configuration */
	is_scaling_required = dce60_setup_scaling_configuration(xfm_dce, data);

	if (is_scaling_required) {
		/* 3. Calculate and program ratio, DCE6 filter initialization */
		struct sclh_ratios_inits inits = { 0 };

		/* DCE6 has specific calculate_inits() function */
		dce60_calculate_inits(xfm_dce, data, &inits);

		/* DCE6 has specific program_scl_ratios_inits() function */
		dce60_program_scl_ratios_inits(xfm_dce, &inits);

		coeffs_v = get_filter_coeffs_16p(data->taps.v_taps, data->ratios.vert);
		coeffs_h = get_filter_coeffs_16p(data->taps.h_taps, data->ratios.horz);

		if (coeffs_v != xfm_dce->filter_v || coeffs_h != xfm_dce->filter_h) {
			/* 4. Program vertical filters */
			if (xfm_dce->filter_v == NULL)

Annotation

Implementation Notes