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drm/rockchip: dw_dp: parse link-frequencies property of output endpoint

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Add capability to parse and retrieve max DP link supported rate
from link-frequencies property of output endpoint.

Change-Id: I7fdc0f509eef3043d3940fe2639b3fbbc61fbfec
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
This commit is contained in:
Wyon Bi
2023-04-11 00:50:48 +00:00
committed by Tao Huang
parent c8bdf75ed6
commit c91c1a5fdc
1 changed files with 54 additions and 3 deletions
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57
drivers/gpu/drm/rockchip/dw-dp.c
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@@ -396,6 +396,8 @@ struct dw_dp {
struct rockchip_drm_sub_dev sub_dev;
struct dw_dp_hdcp hdcp;
int eotf_type;
u32 max_link_rate;
};
struct dw_dp_state {
@@ -1469,7 +1471,7 @@ static int dw_dp_link_probe(struct dw_dp *dp)
!!(dpcd & DP_VSC_SDP_EXT_FOR_COLORIMETRY_SUPPORTED);
link->revision = link->dpcd[DP_DPCD_REV];
link->rate = min_t(u32, dp->phy->attrs.max_link_rate * 100,
link->rate = min_t(u32, min(dp->max_link_rate, dp->phy->attrs.max_link_rate * 100),
drm_dp_max_link_rate(link->dpcd));
link->lanes = min_t(u8, phy_get_bus_width(dp->phy),
drm_dp_max_lane_count(link->dpcd));
@@ -3933,6 +3935,53 @@ static const struct regmap_config dw_dp_regmap_config = {
.rd_table = &dw_dp_readable_table,
};
static u32 dw_dp_parse_link_frequencies(struct dw_dp *dp)
{
struct device_node *node = dp->dev->of_node;
struct device_node *endpoint;
u64 frequency = 0;
int cnt;
endpoint = of_graph_get_endpoint_by_regs(node, 1, 0);
if (!endpoint)
return 0;
cnt = of_property_count_u64_elems(endpoint, "link-frequencies");
if (cnt > 0)
of_property_read_u64_index(endpoint, "link-frequencies",
cnt - 1, &frequency);
of_node_put(endpoint);
if (!frequency)
return 0;
do_div(frequency, 10 * 1000); /* symbol rate kbytes */
switch (frequency) {
case 162000:
case 270000:
case 540000:
case 810000:
break;
default:
dev_err(dp->dev, "invalid link frequency value: %llu\n", frequency);
return 0;
}
return frequency;
}
static int dw_dp_parse_dt(struct dw_dp *dp)
{
dp->force_hpd = device_property_read_bool(dp->dev, "force-hpd");
dp->max_link_rate = dw_dp_parse_link_frequencies(dp);
if (!dp->max_link_rate)
dp->max_link_rate = 810000;
return 0;
}
static int dw_dp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -3952,6 +4001,10 @@ static int dw_dp_probe(struct platform_device *pdev)
dp->dev = dev;
dp->video.pixel_mode = DPTX_MP_QUAD_PIXEL;
ret = dw_dp_parse_dt(dp);
if (ret)
return dev_err_probe(dev, ret, "failed to parse DT\n");
mutex_init(&dp->irq_lock);
INIT_WORK(&dp->hpd_work, dw_dp_hpd_work);
init_completion(&dp->complete);
@@ -4076,8 +4129,6 @@ static int dw_dp_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dp);
dp->force_hpd = device_property_read_bool(dev, "force-hpd");
if (device_property_read_bool(dev, "split-mode")) {
struct dw_dp *secondary = dw_dp_find_by_id(dev->driver, !dp->id);