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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 c7530c70e4
commit ada06fcdb5
1 changed files with 38 additions and 0 deletions
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38
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
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@@ -41,6 +41,20 @@ 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;
@@ -607,6 +621,7 @@ static void analogix_dp_get_max_rx_lane_count(struct analogix_dp_device *dp,
static int analogix_dp_full_link_train(struct analogix_dp_device *dp,
u32 max_lanes, u32 max_rate)
{
struct video_info *video = &dp->video_info;
int retval = 0;
bool training_finished = false;
u8 dpcd;
@@ -635,6 +650,13 @@ static int analogix_dp_full_link_train(struct analogix_dp_device *dp,
dp->link_train.lane_count = (u8)LANE_COUNT1;
}
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;
}
drm_dp_dpcd_readb(&dp->aux, DP_MAX_DOWNSPREAD, &dpcd);
dp->link_train.ssc = !!(dpcd & DP_MAX_DOWNSPREAD_0_5);
@@ -1482,6 +1504,21 @@ 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_info *info,
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 const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
@@ -1492,6 +1529,7 @@ static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
.atomic_post_disable = analogix_dp_bridge_atomic_post_disable,
.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,