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// 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>
#include <drm/drm_print.h>
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 len;
ssize_t rlen;
struct dp_panel_private *panel;
struct dp_link_info *link_info;
u8 *dpcd, major = 0, minor = 0, temp;
u32 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, 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;
}
temp = dpcd[DP_TRAINING_AUX_RD_INTERVAL];
/* 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;
}
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;
dp_panel->dfp_present = dpcd[DP_DOWNSTREAMPORT_PRESENT];
dp_panel->dfp_present &= DP_DWN_STRM_PORT_PRESENT;
if (dp_panel->dfp_present && (dpcd[DP_DPCD_REV] > 0x10)) {
dp_panel->ds_port_cnt = dpcd[DP_DOWN_STREAM_PORT_COUNT];
dp_panel->ds_port_cnt &= DP_PORT_COUNT_MASK;
len = DP_DOWNSTREAM_PORTS * DP_DOWNSTREAM_CAP_SIZE;
rlen = drm_dp_dpcd_read(panel->aux,
DP_DOWNSTREAM_PORT_0, dp_panel->ds_cap_info, len);
if (rlen < len) {
DRM_ERROR("ds port status failed, rlen=%zd\n", rlen);
rc = -EINVAL;
goto end;
}
}
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 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);
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;
int rlen, count;
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);
if (rc) {
DRM_ERROR("read dpcd failed %d\n", rc);
return rc;
}
bw_code = drm_dp_link_rate_to_bw_code(dp_panel->link_info.rate);
if (!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("Illegal link rate=%d lane=%d\n", dp_panel->link_info.rate,
dp_panel->link_info.num_lanes);
return -EINVAL;
}
if (dp_panel->dfp_present) {
rlen = drm_dp_dpcd_read(panel->aux, DP_SINK_COUNT,
&count, 1);
if (rlen == 1) {
count = DP_GET_SINK_COUNT(count);
if (!count) {
DRM_ERROR("no downstream ports connected\n");
panel->link->sink_count = 0;
rc = -ENOTCONN;
goto end;
}
}
}
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");
/* check edid read fail is due to unplug */
if (!dp_catalog_link_is_connected(panel->catalog)) {
rc = -ETIMEDOUT;
goto end;
}
/* fail safe edid */
mutex_lock(&connector->dev->mode_config.mutex);
if (drm_add_modes_noedid(connector, 640, 480))
drm_set_preferred_mode(connector, 640, 480);
mutex_unlock(&connector->dev->mode_config.mutex);
}
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;
}
end:
return rc;
}
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)
{
if (!dp_panel) {
DRM_ERROR("invalid input\n");
return -EINVAL;
}
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)
{
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 0;
}
int dp_panel_init_panel_info(struct dp_panel *dp_panel)
{
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 0;
}
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);
}
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