drm/msm/dp: add displayPort driver support

Add the needed displayPort files to enable DP driver
on msm target.

"dp_display" module is the main module that calls into
other sub-modules. "dp_drm" file represents the interface
between DRM framework and DP driver.

Changes in v12:

-- Add support of pm ops in display port driver
-- Clear bpp depth bits before writing to MISC register
-- Fix edid read

Previous Change log:
https://lkml.kernel.org/lkml/20200818051137.21478-3-tanmay@codeaurora.org/

Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>
Signed-off-by: Vara Reddy <varar@codeaurora.org>
Signed-off-by: Tanmay Shah <tanmay@codeaurora.org>
Co-developed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
Co-developed-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Co-developed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Co-developed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

1 files changed, 486 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
new file mode 100644
index 000000000000..5ac4b017da8f
--- /dev/null
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -0,0 +1,486 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
+ */
+
+#include "dp_panel.h"
+
+#include <drm/drm_connector.h>
+#include <drm/drm_edid.h>
+
+#define DP_MAX_DS_PORT_COUNT 1
+
+struct dp_panel_private {
+	struct device *dev;
+	struct dp_panel dp_panel;
+	struct drm_dp_aux *aux;
+	struct dp_link *link;
+	struct dp_catalog *catalog;
+	bool panel_on;
+	bool aux_cfg_update_done;
+};
+
+static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
+{
+	int rc = 0;
+	size_t rlen;
+	struct dp_panel_private *panel;
+	struct dp_link_info *link_info;
+	u8 *dpcd, major = 0, minor = 0, temp;
+	u32 dfp_count = 0, offset = DP_DPCD_REV;
+
+	dpcd = dp_panel->dpcd;
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+	link_info = &dp_panel->link_info;
+
+	rlen = drm_dp_dpcd_read(panel->aux,
+				DP_TRAINING_AUX_RD_INTERVAL, &temp, 1);
+	if (rlen < 0) {
+		DRM_ERROR("err reading DP_TRAINING_AUX_RD_INTERVAL,rlen=%zd\n",
+				rlen);
+		rc = -EINVAL;
+		goto end;
+	}
+
+	/* check for EXTENDED_RECEIVER_CAPABILITY_FIELD_PRESENT */
+	if (temp & BIT(7)) {
+		DRM_DEBUG_DP("using EXTENDED_RECEIVER_CAPABILITY_FIELD\n");
+		offset = DPRX_EXTENDED_DPCD_FIELD;
+	}
+
+	rlen = drm_dp_dpcd_read(panel->aux, offset,
+		dpcd, (DP_RECEIVER_CAP_SIZE + 1));
+	if (rlen < (DP_RECEIVER_CAP_SIZE + 1)) {
+		DRM_ERROR("dpcd read failed, rlen=%zd\n", rlen);
+		if (rlen == -ETIMEDOUT)
+			rc = rlen;
+		else
+			rc = -EINVAL;
+
+		goto end;
+	}
+
+	print_hex_dump(KERN_DEBUG, "[drm-dp] SINK DPCD: ",
+		DUMP_PREFIX_NONE, 8, 1, dp_panel->dpcd, rlen, false);
+
+	link_info->revision = dpcd[DP_DPCD_REV];
+	major = (link_info->revision >> 4) & 0x0f;
+	minor = link_info->revision & 0x0f;
+
+	link_info->rate = drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
+	link_info->num_lanes = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
+
+	if (link_info->num_lanes > dp_panel->max_dp_lanes)
+		link_info->num_lanes = dp_panel->max_dp_lanes;
+
+	/* Limit support upto HBR2 until HBR3 support is added */
+	if (link_info->rate >= (drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4)))
+		link_info->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
+
+	DRM_DEBUG_DP("version: %d.%d\n", major, minor);
+	DRM_DEBUG_DP("link_rate=%d\n", link_info->rate);
+	DRM_DEBUG_DP("lane_count=%d\n", link_info->num_lanes);
+
+	if (drm_dp_enhanced_frame_cap(dpcd))
+		link_info->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING;
+
+	dfp_count = dpcd[DP_DOWN_STREAM_PORT_COUNT] &
+						DP_DOWN_STREAM_PORT_COUNT;
+
+	if (dfp_count > DP_MAX_DS_PORT_COUNT) {
+		DRM_ERROR("DS port count %d greater that max (%d) supported\n",
+			dfp_count, DP_MAX_DS_PORT_COUNT);
+		return -EINVAL;
+	}
+end:
+	return rc;
+}
+
+static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel,
+		u32 mode_edid_bpp, u32 mode_pclk_khz)
+{
+	struct dp_link_info *link_info;
+	const u32 max_supported_bpp = 30, min_supported_bpp = 18;
+	u32 bpp = 0, data_rate_khz = 0;
+
+	bpp = min_t(u32, mode_edid_bpp, max_supported_bpp);
+
+	link_info = &dp_panel->link_info;
+	data_rate_khz = link_info->num_lanes * link_info->rate * 8;
+
+	while (bpp > min_supported_bpp) {
+		if (mode_pclk_khz * bpp <= data_rate_khz)
+			break;
+		bpp -= 6;
+	}
+
+	return bpp;
+}
+
+static void dp_panel_set_test_mode(struct dp_panel_private *panel,
+		struct dp_display_mode *mode)
+{
+	struct drm_display_mode *drm_mode = NULL;
+	struct dp_link_test_video *test_info = NULL;
+
+	drm_mode = &mode->drm_mode;
+	test_info = &panel->link->test_video;
+
+	drm_mode->hdisplay = test_info->test_h_width;
+	drm_mode->hsync_start = drm_mode->hdisplay + test_info->test_h_total -
+			(test_info->test_h_start + test_info->test_h_width);
+	drm_mode->hsync_end = drm_mode->hsync_start +
+				test_info->test_hsync_width;
+	drm_mode->htotal = drm_mode->hsync_end + test_info->test_h_start -
+						test_info->test_hsync_width;
+
+	drm_mode->vdisplay = test_info->test_v_height;
+	drm_mode->vsync_start = drm_mode->vdisplay + test_info->test_v_total -
+			(test_info->test_v_start + test_info->test_v_height);
+	drm_mode->vsync_end = drm_mode->vsync_start +
+				test_info->test_vsync_width;
+	drm_mode->vtotal = drm_mode->vsync_end + test_info->test_v_start -
+						test_info->test_vsync_width;
+
+	drm_mode->clock = test_info->test_h_total *
+		test_info->test_v_total * test_info->test_rr_n;
+
+	drm_mode->type = 0x48;
+	drm_mode_set_name(drm_mode);
+
+	if (test_info->test_rr_d == 0)
+		drm_mode->clock /= 1000;
+	else
+		drm_mode->clock /= 1001;
+
+	if (test_info->test_h_width == 640)
+		drm_mode->clock = 25170;
+}
+
+static int dp_panel_update_modes(struct drm_connector *connector,
+	struct edid *edid)
+{
+	int rc = 0;
+
+	if (edid) {
+		rc = drm_connector_update_edid_property(connector, edid);
+		if (rc) {
+			DRM_ERROR("failed to update edid property %d\n", rc);
+			return rc;
+		}
+		rc = drm_add_edid_modes(connector, edid);
+		DRM_DEBUG_DP("%s -", __func__);
+		return rc;
+	}
+
+	rc = drm_connector_update_edid_property(connector, NULL);
+	if (rc)
+		DRM_ERROR("failed to update edid property %d\n", rc);
+
+	return rc;
+}
+
+int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
+	struct drm_connector *connector)
+{
+	int rc = 0, bw_code;
+	struct dp_panel_private *panel;
+
+	if (!dp_panel || !connector) {
+		DRM_ERROR("invalid input\n");
+		return -EINVAL;
+	}
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+
+	rc = dp_panel_read_dpcd(dp_panel);
+	bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
+	if (rc || !is_link_rate_valid(bw_code) ||
+			!is_lane_count_valid(dp_panel->link_info.num_lanes) ||
+			(bw_code > dp_panel->max_bw_code)) {
+		DRM_ERROR("read dpcd failed %d\n", rc);
+		return rc;
+	}
+	rc = drm_dp_read_desc(panel->aux, &dp_panel->desc,
+			      drm_dp_is_branch(dp_panel->dpcd));
+	if (rc) {
+		DRM_ERROR("read sink/branch descriptor failed %d\n", rc);
+		return rc;
+	}
+
+	kfree(dp_panel->edid);
+	dp_panel->edid = NULL;
+
+	dp_panel->edid = drm_get_edid(connector,
+					      &panel->aux->ddc);
+	if (!dp_panel->edid) {
+		DRM_ERROR("panel edid read failed\n");
+		return -EINVAL;
+	}
+
+	if (panel->aux_cfg_update_done) {
+		DRM_DEBUG_DP("read DPCD with updated AUX config\n");
+		rc = dp_panel_read_dpcd(dp_panel);
+		bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
+		if (rc || !is_link_rate_valid(bw_code) ||
+			!is_lane_count_valid(dp_panel->link_info.num_lanes)
+			|| (bw_code > dp_panel->max_bw_code)) {
+			DRM_ERROR("read dpcd failed %d\n", rc);
+			return rc;
+		}
+		panel->aux_cfg_update_done = false;
+	}
+
+	return 0;
+}
+
+u32 dp_panel_get_mode_bpp(struct dp_panel *dp_panel,
+		u32 mode_edid_bpp, u32 mode_pclk_khz)
+{
+	struct dp_panel_private *panel;
+	u32 bpp = mode_edid_bpp;
+
+	if (!dp_panel || !mode_edid_bpp || !mode_pclk_khz) {
+		DRM_ERROR("invalid input\n");
+		return 0;
+	}
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+
+	if (dp_panel->video_test)
+		bpp = dp_link_bit_depth_to_bpp(
+				panel->link->test_video.test_bit_depth);
+	else
+		bpp = dp_panel_get_supported_bpp(dp_panel, mode_edid_bpp,
+				mode_pclk_khz);
+
+	return bpp;
+}
+
+int dp_panel_get_modes(struct dp_panel *dp_panel,
+	struct drm_connector *connector, struct dp_display_mode *mode)
+{
+	struct dp_panel_private *panel;
+
+	if (!dp_panel) {
+		DRM_ERROR("invalid input\n");
+		return -EINVAL;
+	}
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+
+	if (dp_panel->video_test) {
+		dp_panel_set_test_mode(panel, mode);
+		return 1;
+	} else if (dp_panel->edid) {
+		return dp_panel_update_modes(connector, dp_panel->edid);
+	}
+
+	return 0;
+}
+
+static u8 dp_panel_get_edid_checksum(struct edid *edid)
+{
+	struct edid *last_block;
+	u8 *raw_edid;
+	bool is_edid_corrupt;
+
+	if (!edid) {
+		DRM_ERROR("invalid edid input\n");
+		return 0;
+	}
+
+	raw_edid = (u8 *)edid;
+	raw_edid += (edid->extensions * EDID_LENGTH);
+	last_block = (struct edid *)raw_edid;
+
+	/* block type extension */
+	drm_edid_block_valid(raw_edid, 1, false, &is_edid_corrupt);
+	if (!is_edid_corrupt)
+		return last_block->checksum;
+
+	DRM_ERROR("Invalid block, no checksum\n");
+	return 0;
+}
+
+void dp_panel_handle_sink_request(struct dp_panel *dp_panel)
+{
+	struct dp_panel_private *panel;
+
+	if (!dp_panel) {
+		DRM_ERROR("invalid input\n");
+		return;
+	}
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+
+	if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
+		u8 checksum = dp_panel_get_edid_checksum(dp_panel->edid);
+
+		dp_link_send_edid_checksum(panel->link, checksum);
+		dp_link_send_test_response(panel->link);
+	}
+}
+
+void dp_panel_tpg_config(struct dp_panel *dp_panel, bool enable)
+{
+	struct dp_catalog *catalog;
+	struct dp_panel_private *panel;
+
+	if (!dp_panel) {
+		DRM_ERROR("invalid input\n");
+		return;
+	}
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+	catalog = panel->catalog;
+
+	if (!panel->panel_on) {
+		DRM_DEBUG_DP("DP panel not enabled, handle TPG on next on\n");
+		return;
+	}
+
+	if (!enable) {
+		dp_catalog_panel_tpg_disable(catalog);
+		return;
+	}
+
+	DRM_DEBUG_DP("%s: calling catalog tpg_enable\n", __func__);
+	dp_catalog_panel_tpg_enable(catalog, &panel->dp_panel.dp_mode.drm_mode);
+}
+
+void dp_panel_dump_regs(struct dp_panel *dp_panel)
+{
+	struct dp_catalog *catalog;
+	struct dp_panel_private *panel;
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+	catalog = panel->catalog;
+
+	dp_catalog_dump_regs(catalog);
+}
+
+int dp_panel_timing_cfg(struct dp_panel *dp_panel)
+{
+	int rc = 0;
+	u32 data, total_ver, total_hor;
+	struct dp_catalog *catalog;
+	struct dp_panel_private *panel;
+	struct drm_display_mode *drm_mode;
+
+	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
+	catalog = panel->catalog;
+	drm_mode = &panel->dp_panel.dp_mode.drm_mode;
+
+	DRM_DEBUG_DP("width=%d hporch= %d %d %d\n",
+		drm_mode->hdisplay, drm_mode->htotal - drm_mode->hsync_end,
+		drm_mode->hsync_start - drm_mode->hdisplay,
+		drm_mode->hsync_end - drm_mode->hsync_start);
+
+	DRM_DEBUG_DP("height=%d vporch= %d %d %d\n",
+		drm_mode->vdisplay, drm_mode->vtotal - drm_mode->vsync_end,
+		drm_mode->vsync_start - drm_mode->vdisplay,
+		drm_mode->vsync_end - drm_mode->vsync_start);
+
+	total_hor = drm_mode->htotal;
+
+	total_ver = drm_mode->vtotal;
+
+	data = total_ver;
+	data <<= 16;
+	data |= total_hor;
+
+	catalog->total = data;
+
+	data = (drm_mode->vtotal - drm_mode->vsync_start);
+	data <<= 16;
+	data |= (drm_mode->htotal - drm_mode->hsync_start);
+
+	catalog->sync_start = data;
+
+	data = drm_mode->vsync_end - drm_mode->vsync_start;
+	data <<= 16;
+	data |= (panel->dp_panel.dp_mode.v_active_low << 31);
+	data |= drm_mode->hsync_end - drm_mode->hsync_start;
+	data |= (panel->dp_panel.dp_mode.h_active_low << 15);
+
+	catalog->width_blanking = data;
+
+	data = drm_mode->vdisplay;
+	data <<= 16;
+	data |= drm_mode->hdisplay;
+
+	catalog->dp_active = data;
+
+	dp_catalog_panel_timing_cfg(catalog);
+	panel->panel_on = true;
+
+	return rc;
+}
+
+int dp_panel_init_panel_info(struct dp_panel *dp_panel)
+{
+	int rc = 0;
+	struct drm_display_mode *drm_mode;
+
+	drm_mode = &dp_panel->dp_mode.drm_mode;
+
+	/*
+	 * print resolution info as this is a result
+	 * of user initiated action of cable connection
+	 */
+	DRM_DEBUG_DP("SET NEW RESOLUTION:\n");
+	DRM_DEBUG_DP("%dx%d@%dfps\n", drm_mode->hdisplay,
+		drm_mode->vdisplay, drm_mode_vrefresh(drm_mode));
+	DRM_DEBUG_DP("h_porches(back|front|width) = (%d|%d|%d)\n",
+			drm_mode->htotal - drm_mode->hsync_end,
+			drm_mode->hsync_start - drm_mode->hdisplay,
+			drm_mode->hsync_end - drm_mode->hsync_start);
+	DRM_DEBUG_DP("v_porches(back|front|width) = (%d|%d|%d)\n",
+			drm_mode->vtotal - drm_mode->vsync_end,
+			drm_mode->vsync_start - drm_mode->vdisplay,
+			drm_mode->vsync_end - drm_mode->vsync_start);
+	DRM_DEBUG_DP("pixel clock (KHz)=(%d)\n", drm_mode->clock);
+	DRM_DEBUG_DP("bpp = %d\n", dp_panel->dp_mode.bpp);
+
+	dp_panel->dp_mode.bpp = max_t(u32, 18,
+					min_t(u32, dp_panel->dp_mode.bpp, 30));
+	DRM_DEBUG_DP("updated bpp = %d\n", dp_panel->dp_mode.bpp);
+
+	return rc;
+}
+
+struct dp_panel *dp_panel_get(struct dp_panel_in *in)
+{
+	struct dp_panel_private *panel;
+	struct dp_panel *dp_panel;
+
+	if (!in->dev || !in->catalog || !in->aux || !in->link) {
+		DRM_ERROR("invalid input\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL);
+	if (!panel)
+		return ERR_PTR(-ENOMEM);
+
+	panel->dev = in->dev;
+	panel->aux = in->aux;
+	panel->catalog = in->catalog;
+	panel->link = in->link;
+
+	dp_panel = &panel->dp_panel;
+	dp_panel->max_bw_code = DP_LINK_BW_8_1;
+	panel->aux_cfg_update_done = false;
+
+	return dp_panel;
+}
+
+void dp_panel_put(struct dp_panel *dp_panel)
+{
+	if (!dp_panel)
+		return;
+
+	kfree(dp_panel->edid);
+}