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drm/bridge: it6505: Send DPCD SET_POWER to downstream

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Send DPCD SET_POWER command to downstream in .atomic_disable to make the
downstream monitor enter the power down mode, so the device suspend won't
be affected.

Fixes: b5c84a9edc ("drm/bridge: add it6505 driver")
Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220425134424.1150965-1-treapking@chromium.org
Reviewed-by: Robert Foss <robert.foss@linaro.org>
This commit is contained in:
Pin-Yen Lin 2022-04-25 21:44:24 +08:00 • committed by Robert Foss
parent 7eafbecd22
commit 46ca7da7f1
No known key found for this signature in database
GPG key ID: 3EFD900F76D1D784
1 changed files with 18 additions and 11 deletions
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29
drivers/gpu/drm/bridge/ite-it6505.c
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@ -737,8 +737,9 @@ static int it6505_drm_dp_link_probe(struct drm_dp_aux *aux,
return 0; return 0;
} }
static int it6505_drm_dp_link_power_up(struct drm_dp_aux *aux, static int it6505_drm_dp_link_set_power(struct drm_dp_aux *aux,
struct it6505_drm_dp_link *link) struct it6505_drm_dp_link *link,
u8 mode)
{ {
u8 value; u8 value;
int err; int err;
@ -752,18 +753,20 @@ static int it6505_drm_dp_link_power_up(struct drm_dp_aux *aux,
return err; return err;
value &= ~DP_SET_POWER_MASK; value &= ~DP_SET_POWER_MASK;
value |= DP_SET_POWER_D0; value |= mode;
err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
if (err < 0) if (err < 0)
return err; return err;
/* if (mode == DP_SET_POWER_D0) {
* According to the DP 1.1 specification, a "Sink Device must exit the /*
* power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink * According to the DP 1.1 specification, a "Sink Device must
* Control Field" (register 0x600). * exit the power saving state within 1 ms" (Section 2.5.3.1,
*/ * Table 5-52, "Sink Control Field" (register 0x600).
usleep_range(1000, 2000); */
usleep_range(1000, 2000);
}
return 0; return 0;
} }
@ -2624,7 +2627,8 @@ static enum drm_connector_status it6505_detect(struct it6505 *it6505)
if (it6505_get_sink_hpd_status(it6505)) { if (it6505_get_sink_hpd_status(it6505)) {
it6505_aux_on(it6505); it6505_aux_on(it6505);
it6505_drm_dp_link_probe(&it6505->aux, &it6505->link); it6505_drm_dp_link_probe(&it6505->aux, &it6505->link);
it6505_drm_dp_link_power_up(&it6505->aux, &it6505->link); it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
DP_SET_POWER_D0);
it6505->auto_train_retry = AUTO_TRAIN_RETRY; it6505->auto_train_retry = AUTO_TRAIN_RETRY;
if (it6505->dpcd[0] == 0) { if (it6505->dpcd[0] == 0) {
@ -2960,8 +2964,11 @@ static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
DRM_DEV_DEBUG_DRIVER(dev, "start"); DRM_DEV_DEBUG_DRIVER(dev, "start");
if (it6505->powered) if (it6505->powered) {
it6505_video_disable(it6505); it6505_video_disable(it6505);
it6505_drm_dp_link_set_power(&it6505->aux, &it6505->link,
DP_SET_POWER_D3);
}
} }
static enum drm_connector_status static enum drm_connector_status