drm/bridge: anx7625: Ensure bridge is suspended in disable()

[ Upstream commit 4d5b7daa3c610af3f322ad1e91fc0c752ff32f0e ]

Similar to commit 26db46bc9c67 ("drm/bridge: parade-ps8640: Ensure bridge
is suspended in .post_disable()"). Add a mutex to ensure that aux transfer
won't race with atomic_disable by holding the PM reference and prevent
the bridge from suspend.

Also we need to use pm_runtime_put_sync_suspend() to suspend the bridge
instead of idle with pm_runtime_put_sync().

Fixes: 3203e497eb76 ("drm/bridge: anx7625: Synchronously run runtime suspend.")
Fixes: adca62ec370c ("drm/bridge: anx7625: Support reading edid through aux channel")
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Xuxin Xiong <xuxinxiong@huaqin.corp-partner.google.com>
Reviewed-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240118015916.2296741-1-hsinyi@chromium.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 51abe42..5168628 100644 (file)
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1741,6 +1741,7 @@ static ssize_t anx7625_aux_transfer(struct drm_dp_aux *aux,
        u8 request = msg->request & ~DP_AUX_I2C_MOT;
        int ret = 0;
 
+       mutex_lock(&ctx->aux_lock);
        pm_runtime_get_sync(dev);
        msg->reply = 0;
        switch (request) {
@@ -1757,6 +1758,7 @@ static ssize_t anx7625_aux_transfer(struct drm_dp_aux *aux,
                                        msg->size, msg->buffer);
        pm_runtime_mark_last_busy(dev);
        pm_runtime_put_autosuspend(dev);
+       mutex_unlock(&ctx->aux_lock);
 
        return ret;
 }
@@ -2453,7 +2455,9 @@ static void anx7625_bridge_atomic_disable(struct drm_bridge *bridge,
        ctx->connector = NULL;
        anx7625_dp_stop(ctx);
 
-       pm_runtime_put_sync(dev);
+       mutex_lock(&ctx->aux_lock);
+       pm_runtime_put_sync_suspend(dev);
+       mutex_unlock(&ctx->aux_lock);
 }
 
 static enum drm_connector_status
@@ -2647,6 +2651,7 @@ static int anx7625_i2c_probe(struct i2c_client *client)
 
        mutex_init(&platform->lock);
        mutex_init(&platform->hdcp_wq_lock);
+       mutex_init(&platform->aux_lock);
 
        INIT_DELAYED_WORK(&platform->hdcp_work, hdcp_check_work_func);
        platform->hdcp_workqueue = create_workqueue("hdcp workqueue");

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 5af8196..80d3fb4 100644 (file)
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -471,6 +471,8 @@ struct anx7625_data {
        struct workqueue_struct *hdcp_workqueue;
        /* Lock for hdcp work queue */
        struct mutex hdcp_wq_lock;
+       /* Lock for aux transfer and disable */
+       struct mutex aux_lock;
        char edid_block;
        struct display_timing dt;
        u8 display_timing_valid;