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drm/bridge: analogix_dp: Add support for &drm_dp_aux.wait_hpd_asserted()

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Add analogix_dpaux_wait_hpd_asserted() to help confirm the HPD state
before doing AUX transfers.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20250310104114.2608063-8-damon.ding@rock-chips.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Damon Ding
2025-03-10 18:41:08 +08:00
committed by Dmitry Baryshkov
parent e5e9fa9f7a
commit c8f0b7cb01
1 changed files with 21 additions and 0 deletions
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21
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
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@@ -1540,6 +1540,26 @@ static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
return ret;
}
static int analogix_dpaux_wait_hpd_asserted(struct drm_dp_aux *aux, unsigned long wait_us)
{
struct analogix_dp_device *dp = to_dp(aux);
int val;
int ret;
if (dp->force_hpd)
return 0;
pm_runtime_get_sync(dp->dev);
ret = readx_poll_timeout(analogix_dp_get_plug_in_status, dp, val, !val,
wait_us / 100, wait_us);
pm_runtime_mark_last_busy(dp->dev);
pm_runtime_put_autosuspend(dp->dev);
return ret;
}
struct analogix_dp_device *
analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
{
@@ -1648,6 +1668,7 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
dp->aux.name = "DP-AUX";
dp->aux.transfer = analogix_dpaux_transfer;
dp->aux.wait_hpd_asserted = analogix_dpaux_wait_hpd_asserted;
dp->aux.dev = dp->dev;
drm_dp_aux_init(&dp->aux);