A few fixes for the next merge window, with some build fixes for anx7625

and lt8912b bridges, incorrect error handling for lt8912b and TTM, and
 one fix for TTM page limit accounting.
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Merge tag 'drm-misc-next-fixes-2021-04-22' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

A few fixes for the next merge window, with some build fixes for anx7625
and lt8912b bridges, incorrect error handling for lt8912b and TTM, and
one fix for TTM page limit accounting.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210422163329.dvbuwre3akwdmzjt@gilmour

drivers/gpu/drm/bridge/Kconfig

@@ -66,6 +66,7 @@ config DRM_LONTIUM_LT8912B
 	depends on OF
 	select DRM_PANEL_BRIDGE
 	select DRM_KMS_HELPER
+	select DRM_MIPI_DSI
 	select REGMAP_I2C
 	help
 	  Driver for Lontium LT8912B DSI to HDMI bridge
@@ -81,6 +82,7 @@ config DRM_LONTIUM_LT9611
 	depends on OF
 	select DRM_PANEL_BRIDGE
 	select DRM_KMS_HELPER
+	select DRM_MIPI_DSI
 	select REGMAP_I2C
 	help
 	  Driver for Lontium LT9611 DSI to HDMI bridge
@@ -94,6 +96,7 @@ config DRM_LONTIUM_LT9611UXC
 	depends on OF
 	select DRM_PANEL_BRIDGE
 	select DRM_KMS_HELPER
+	select DRM_MIPI_DSI
 	select REGMAP_I2C
 	help
 	  Driver for Lontium LT9611UXC DSI to HDMI bridge

drivers/gpu/drm/bridge/analogix/Kconfig

@@ -30,6 +30,7 @@ config DRM_ANALOGIX_ANX7625
 	tristate "Analogix Anx7625 MIPI to DP interface support"
 	depends on DRM
 	depends on OF
+	select DRM_MIPI_DSI
 	help
 	  ANX7625 is an ultra-low power 4K mobile HD transmitter
 	  designed for portable devices. It converts MIPI/DPI to

drivers/gpu/drm/bridge/lontium-lt8912b.c

@@ -622,7 +622,8 @@ static int lt8912_parse_dt(struct lt8912 *lt)
 {
 	struct gpio_desc *gp_reset;
 	struct device *dev = lt->dev;
-	int ret = 0;
+	int ret;
+	int data_lanes;
 	struct device_node *port_node;
 	struct device_node *endpoint;
 
@@ -636,19 +637,21 @@ static int lt8912_parse_dt(struct lt8912 *lt)
 	lt->gp_reset = gp_reset;
 
 	endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
-	if (IS_ERR(endpoint)) {
+	if (!endpoint)
-		ret = PTR_ERR(endpoint);
+		return -ENODEV;
-		goto end;
-	}
 
-	lt->data_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
+	data_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
 	of_node_put(endpoint);
+	if (data_lanes < 0) {
+		dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__);
+		return data_lanes;
+	}
+	lt->data_lanes = data_lanes;
 
 	lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);
 	if (!lt->host_node) {
 		dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);
-		ret = -ENODEV;
+		return -ENODEV;
-		goto end;
 	}
 
 	port_node = of_graph_get_remote_node(dev->of_node, 1, -1);
@@ -659,24 +662,23 @@ static int lt8912_parse_dt(struct lt8912 *lt)
 	}
 
 	lt->hdmi_port = of_drm_find_bridge(port_node);
-	if (IS_ERR(lt->hdmi_port)) {
+	if (!lt->hdmi_port) {
 		dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
-		ret = PTR_ERR(lt->hdmi_port);
+		ret = -ENODEV;
-		of_node_put(lt->host_node);
+		goto err_free_host_node;
-		goto end;
 	}
 
 	if (!of_device_is_compatible(port_node, "hdmi-connector")) {
 		dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
 		ret = -EINVAL;
+		goto err_free_host_node;
 	}
 
 	of_node_put(port_node);
-
+	return 0;
-end:
-	return ret;
 
 err_free_host_node:
+	of_node_put(port_node);
 	of_node_put(lt->host_node);
 	return ret;
 }

drivers/gpu/drm/ttm/ttm_tt.c

@@ -317,16 +317,19 @@ int ttm_tt_populate(struct ttm_device *bdev,
 	if (ttm_tt_is_populated(ttm))
 		return 0;
 
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 		atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
 		if (bdev->pool.use_dma32)
-		atomic_long_add(ttm->num_pages, &ttm_dma32_pages_allocated);
+			atomic_long_add(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
 
 	while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit ||
 	       atomic_long_read(&ttm_dma32_pages_allocated) >
 	       ttm_dma32_pages_limit) {
 
 		ret = ttm_global_swapout(ctx, GFP_KERNEL);
-		if (ret)
+		if (ret < 0)
 			goto error;
 	}
 
@@ -350,9 +353,12 @@ int ttm_tt_populate(struct ttm_device *bdev,
 	return 0;
 
 error:
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 		atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
 		if (bdev->pool.use_dma32)
-		atomic_long_sub(ttm->num_pages, &ttm_dma32_pages_allocated);
+			atomic_long_sub(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
 	return ret;
 }
 EXPORT_SYMBOL(ttm_tt_populate);
@@ -382,9 +388,12 @@ void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
 	else
 		ttm_pool_free(&bdev->pool, ttm);
 
+	if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 		atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
 		if (bdev->pool.use_dma32)
-		atomic_long_sub(ttm->num_pages, &ttm_dma32_pages_allocated);
+			atomic_long_sub(ttm->num_pages,
+					&ttm_dma32_pages_allocated);
+	}
 
 	ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED;
 }