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drm/bridge: it6505: Add caching for EDID

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Add caching when EDID is read, and invalidate the cache until the
bridge detects HPD low or sink count changes on HPD_IRQ.

It takes 1.2s for IT6505 bridge to read a 3-block EDID, and skipping
one EDID read would be a notable difference on user experience.

Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221115112720.911158-1-treapking@chromium.org
This commit is contained in:
Pin-yen Lin 2022-11-15 19:27:20 +08:00 committed by Robert Foss
parent 2a9df204be
commit 11feaef69d
No known key found for this signature in database
GPG key ID: 3EFD900F76D1D784
1 changed files with 19 additions and 6 deletions
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25
drivers/gpu/drm/bridge/ite-it6505.c
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@ -456,6 +456,8 @@ struct it6505 {
/* it6505 driver hold option */
bool enable_drv_hold;
struct edid *cached_edid;
};
struct it6505_step_train_para {
@ -2243,6 +2245,12 @@ static void it6505_plugged_status_to_codec(struct it6505 *it6505)
status == connector_status_connected);
}
static void it6505_remove_edid(struct it6505 *it6505)
{
kfree(it6505->cached_edid);
it6505->cached_edid = NULL;
}
static int it6505_process_hpd_irq(struct it6505 *it6505)
{
struct device *dev = &it6505->client->dev;
@ -2269,6 +2277,7 @@ static int it6505_process_hpd_irq(struct it6505 *it6505)
it6505_reset_logic(it6505);
it6505_int_mask_enable(it6505);
it6505_init(it6505);
it6505_remove_edid(it6505);
return 0;
}
@ -2352,6 +2361,7 @@ static void it6505_irq_hpd(struct it6505 *it6505)
it6505_video_reset(it6505);
} else {
memset(it6505->dpcd, 0, sizeof(it6505->dpcd));
it6505_remove_edid(it6505);
if (it6505->hdcp_desired)
it6505_stop_hdcp(it6505);
@ -3011,16 +3021,18 @@ static struct edid *it6505_bridge_get_edid(struct drm_bridge *bridge,
{
struct it6505 *it6505 = bridge_to_it6505(bridge);
struct device *dev = &it6505->client->dev;
struct edid *edid;
edid = drm_do_get_edid(connector, it6505_get_edid_block, it6505);
if (!it6505->cached_edid) {
it6505->cached_edid = drm_do_get_edid(connector, it6505_get_edid_block,
it6505);
if (!edid) {
DRM_DEV_DEBUG_DRIVER(dev, "failed to get edid!");
return NULL;
if (!it6505->cached_edid) {
DRM_DEV_DEBUG_DRIVER(dev, "failed to get edid!");
return NULL;
}
}
return edid;
return drm_edid_duplicate(it6505->cached_edid);
}
static const struct drm_bridge_funcs it6505_bridge_funcs = {
@ -3360,6 +3372,7 @@ static void it6505_i2c_remove(struct i2c_client *client)
drm_dp_aux_unregister(&it6505->aux);
it6505_debugfs_remove(it6505);
it6505_poweroff(it6505);
it6505_remove_edid(it6505);
}
static const struct i2c_device_id it6505_id[] = {