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drm/bridge: analogix_dp: Add bankwidth check

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Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
Change-Id: Ia2f2e53cd0b16ca6401e53f949b8746f3be15dfc
This commit is contained in:
Wyon Bi
2020-11-14 11:41:29 +08:00
committed by Tao Huang
parent 28f15a4887
commit 91107c1c8a
1 changed files with 36 additions and 0 deletions
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36
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
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@@ -43,6 +43,20 @@ struct bridge_init {
struct device_node *node;
};
static bool analogix_dp_bandwidth_ok(struct analogix_dp_device *dp,
const struct drm_display_mode *mode,
unsigned int rate, unsigned int lanes)
{
u32 max_bw, req_bw, bpp = 24;
req_bw = mode->clock * bpp / 8;
max_bw = lanes * rate;
if (req_bw > max_bw)
return false;
return true;
}
static int analogix_dp_init_dp(struct analogix_dp_device *dp)
{
int ret;
@@ -965,6 +979,13 @@ static int analogix_dp_commit(struct analogix_dp_device *dp)
return ret;
}
if (!analogix_dp_bandwidth_ok(dp, &video->mode,
drm_dp_bw_code_to_link_rate(dp->link_train.link_rate),
dp->link_train.lane_count)) {
dev_err(dp->dev, "bandwidth overflow\n");
return -EINVAL;
}
ret = analogix_dp_enable_scramble(dp, 1);
if (ret < 0) {
dev_err(dp->dev, "can not enable scramble\n");
@@ -1384,6 +1405,20 @@ static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
video->interlaced = true;
}
static enum drm_mode_status
analogix_dp_bridge_mode_valid(struct drm_bridge *bridge,
const struct drm_display_mode *mode)
{
struct analogix_dp_device *dp = bridge->driver_private;
if (!analogix_dp_bandwidth_ok(dp, mode,
drm_dp_bw_code_to_link_rate(dp->video_info.max_link_rate),
dp->video_info.max_lane_count))
return MODE_BAD;
return MODE_OK;
}
static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
{
/* do nothing */
@@ -1396,6 +1431,7 @@ static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
.post_disable = analogix_dp_bridge_nop,
.mode_set = analogix_dp_bridge_mode_set,
.attach = analogix_dp_bridge_attach,
.mode_valid = analogix_dp_bridge_mode_valid,
};
static int analogix_dp_create_bridge(struct drm_device *drm_dev,