drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
Extension
.c
Size
21216 bytes
Lines
684
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 (i >= TRANSFER_FUNC_POINTS) {
				DC_LOG_ERROR("Index out of bounds: i=%u, TRANSFER_FUNC_POINTS=%u\n",
					     i, (uint32_t)TRANSFER_FUNC_POINTS);
				return false;
			}
			rgb_resulted[j].red = output_tf->tf_pts.red[i];
			rgb_resulted[j].green = output_tf->tf_pts.green[i];
			rgb_resulted[j].blue = output_tf->tf_pts.blue[i];
			j++;
		}
	}

	/* last point */
	start_index = (region_end + MAX_LOW_POINT) * NUMBER_SW_SEGMENTS;
	rgb_resulted[hw_points - 1].red = output_tf->tf_pts.red[start_index];
	rgb_resulted[hw_points - 1].green = output_tf->tf_pts.green[start_index];
	rgb_resulted[hw_points - 1].blue = output_tf->tf_pts.blue[start_index];

	rgb_resulted[hw_points].red = rgb_resulted[hw_points - 1].red;
	rgb_resulted[hw_points].green = rgb_resulted[hw_points - 1].green;
	rgb_resulted[hw_points].blue = rgb_resulted[hw_points - 1].blue;

	// All 3 color channels have same x
	corner_points[0].red.x = dc_fixpt_pow(dc_fixpt_from_int(2),
					     dc_fixpt_from_int(region_start));
	corner_points[0].green.x = corner_points[0].red.x;
	corner_points[0].blue.x = corner_points[0].red.x;

	corner_points[1].red.x = dc_fixpt_pow(dc_fixpt_from_int(2),
					     dc_fixpt_from_int(region_end));
	corner_points[1].green.x = corner_points[1].red.x;
	corner_points[1].blue.x = corner_points[1].red.x;

	corner_points[0].red.y = rgb_resulted[0].red;
	corner_points[0].green.y = rgb_resulted[0].green;
	corner_points[0].blue.y = rgb_resulted[0].blue;

	corner_points[0].red.slope = dc_fixpt_div(corner_points[0].red.y,
			corner_points[0].red.x);
	corner_points[0].green.slope = dc_fixpt_div(corner_points[0].green.y,
			corner_points[0].green.x);
	corner_points[0].blue.slope = dc_fixpt_div(corner_points[0].blue.y,
			corner_points[0].blue.x);

	/* see comment above, m_arrPoints[1].y should be the Y value for the
	 * region end (m_numOfHwPoints), not last HW point(m_numOfHwPoints - 1)
	 */
	corner_points[1].red.y = rgb_resulted[hw_points - 1].red;
	corner_points[1].green.y = rgb_resulted[hw_points - 1].green;
	corner_points[1].blue.y = rgb_resulted[hw_points - 1].blue;
	corner_points[1].red.slope = dc_fixpt_zero;
	corner_points[1].green.slope = dc_fixpt_zero;
	corner_points[1].blue.slope = dc_fixpt_zero;

	if (output_tf->tf == TRANSFER_FUNCTION_PQ) {
		/* for PQ, we want to have a straight line from last HW X point,
		 * and the slope to be such that we hit 1.0 at 10000 nits.
		 */
		const struct fixed31_32 end_value =
				dc_fixpt_from_int(125);

		corner_points[1].red.slope = dc_fixpt_div(
			dc_fixpt_sub(dc_fixpt_one, corner_points[1].red.y),
			dc_fixpt_sub(end_value, corner_points[1].red.x));
		corner_points[1].green.slope = dc_fixpt_div(
			dc_fixpt_sub(dc_fixpt_one, corner_points[1].green.y),
			dc_fixpt_sub(end_value, corner_points[1].green.x));
		corner_points[1].blue.slope = dc_fixpt_div(
			dc_fixpt_sub(dc_fixpt_one, corner_points[1].blue.y),
			dc_fixpt_sub(end_value, corner_points[1].blue.x));
	}

	lut_params->hw_points_num = hw_points;

	k = 0;
	for (i = 1; i < MAX_REGIONS_NUMBER; i++) {
		if (seg_distr[k] != -1) {
			lut_params->arr_curve_points[k].segments_num =
					seg_distr[k];
			lut_params->arr_curve_points[i].offset =
					lut_params->arr_curve_points[k].offset + (1 << seg_distr[k]);
		}
		k++;
	}

	if (seg_distr[k] != -1)
		lut_params->arr_curve_points[k].segments_num = seg_distr[k];

	rgb = rgb_resulted;
	rgb_plus_1 = rgb_resulted + 1;

Annotation

Implementation Notes