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SubjectRe: [PATCH 4/4] drm/bridge: anx7625: Add wait_hpd_asserted() callback
Hi Hsin-Yi, thanks for your patch, it looks good to me.

Reviewed-by: Xin Ji <xji@analogixsemi.com>

Thanks,
Xin

On Thu, Jun 30, 2022 at 12:05:50AM +0800, Hsin-Yi Wang wrote:
> Move hpd polling check into wait_hpd_asserted() callback. For the cases
> that aux transfer function wasn't used, do hpd polling check after pm
> runtime resume, which will power on the bridge.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> ---
> drivers/gpu/drm/bridge/analogix/anx7625.c | 33 ++++++++++++++++++-----
> 1 file changed, 27 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> index 59ddeba33652b..ea5a0b86fe52a 100644
> --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> @@ -1443,23 +1443,24 @@ static int anx7625_read_hpd_status_p0(struct anx7625_data *ctx)
> return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
> }
>
> -static void anx7625_hpd_polling(struct anx7625_data *ctx)
> +static int _anx7625_hpd_polling(struct anx7625_data *ctx,
> + unsigned long wait_us)
> {
> int ret, val;
> struct device *dev = &ctx->client->dev;
>
> /* Interrupt mode, no need poll HPD status, just return */
> if (ctx->pdata.intp_irq)
> - return;
> + return 0;
>
> ret = readx_poll_timeout(anx7625_read_hpd_status_p0,
> ctx, val,
> ((val & HPD_STATUS) || (val < 0)),
> - 5000,
> - 5000 * 100);
> + wait_us / 100,
> + wait_us);
> if (ret) {
> DRM_DEV_ERROR(dev, "no hpd.\n");
> - return;
> + return ret;
> }
>
> DRM_DEV_DEBUG_DRIVER(dev, "system status: 0x%x. HPD raise up.\n", val);
> @@ -1472,6 +1473,23 @@ static void anx7625_hpd_polling(struct anx7625_data *ctx)
>
> if (!ctx->pdata.panel_bridge && ctx->bridge_attached)
> drm_helper_hpd_irq_event(ctx->bridge.dev);
> +
> + return 0;
> +}
> +
> +static int anx7625_wait_hpd_asserted(struct drm_dp_aux *aux,
> + unsigned long wait_us)
> +{
> + struct anx7625_data *ctx = container_of(aux, struct anx7625_data, aux);
> + struct device *dev = &ctx->client->dev;
> + int ret;
> +
> + pm_runtime_get_sync(dev);
> + ret = _anx7625_hpd_polling(ctx, wait_us);
> + pm_runtime_mark_last_busy(dev);
> + pm_runtime_put_autosuspend(dev);
> +
> + return ret;
> }
>
> static void anx7625_remove_edid(struct anx7625_data *ctx)
> @@ -1741,6 +1759,7 @@ static struct edid *anx7625_get_edid(struct anx7625_data *ctx)
> }
>
> pm_runtime_get_sync(dev);
> + _anx7625_hpd_polling(ctx, 5000 * 100);
> edid_num = sp_tx_edid_read(ctx, p_edid->edid_raw_data);
> pm_runtime_put_sync(dev);
>
> @@ -2378,6 +2397,7 @@ static void anx7625_bridge_atomic_enable(struct drm_bridge *bridge,
> ctx->connector = connector;
>
> pm_runtime_get_sync(dev);
> + _anx7625_hpd_polling(ctx, 5000 * 100);
>
> anx7625_dp_start(ctx);
> }
> @@ -2497,7 +2517,6 @@ static int __maybe_unused anx7625_runtime_pm_resume(struct device *dev)
> mutex_lock(&ctx->lock);
>
> anx7625_power_on_init(ctx);
> - anx7625_hpd_polling(ctx);
>
> mutex_unlock(&ctx->lock);
>
> @@ -2589,6 +2608,7 @@ static int anx7625_i2c_probe(struct i2c_client *client,
> platform->aux.name = "anx7625-aux";
> platform->aux.dev = dev;
> platform->aux.transfer = anx7625_aux_transfer;
> + platform->aux.wait_hpd_asserted = anx7625_wait_hpd_asserted;
> drm_dp_aux_init(&platform->aux);
>
> if (anx7625_register_i2c_dummy_clients(platform, client) != 0) {
> @@ -2617,6 +2637,7 @@ static int anx7625_i2c_probe(struct i2c_client *client,
> if (!platform->pdata.low_power_mode) {
> anx7625_disable_pd_protocol(platform);
> pm_runtime_get_sync(dev);
> + _anx7625_hpd_polling(platform, 5000 * 100);
> }
>
> /* Add work function */
> --
> 2.37.0.rc0.161.g10f37bed90-goog

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