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48 lines
1.6 KiB
Diff
48 lines
1.6 KiB
Diff
From 92c85bac95a139c996ef1c9a8047c717e4455d3f Mon Sep 17 00:00:00 2001
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From: Alexey Sheplyakov <asheplyakov@altlinux.org>
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Date: Wed, 26 May 2021 15:23:52 +0400
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Subject: [PATCH] baikal_vdu: figure out (LVDS) endpoint count
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So the driver works correctly even when 'num-lanes' property is missing
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in the device tree.
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---
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drivers/gpu/drm/baikal/baikal_vdu_drv.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/drivers/gpu/drm/baikal/baikal_vdu_drv.c b/drivers/gpu/drm/baikal/baikal_vdu_drv.c
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index 8eb9dda7fa01..f7fb3b81a9f1 100644
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--- a/drivers/gpu/drm/baikal/baikal_vdu_drv.c
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+++ b/drivers/gpu/drm/baikal/baikal_vdu_drv.c
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@@ -71,7 +71,7 @@ static int vdu_modeset_init(struct drm_device *dev)
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struct drm_mode_config *mode_config;
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struct baikal_vdu_private *priv = dev->dev_private;
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struct arm_smccc_res res;
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- int ret = 0;
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+ int ret = 0, ep_count = 0;
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if (priv == NULL)
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return -EINVAL;
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@@ -103,6 +103,12 @@ static int vdu_modeset_init(struct drm_device *dev)
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dev_info(dev->dev, "Bridge probe deferred\n");
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goto out_config;
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}
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+ ep_count = of_graph_get_endpoint_count(dev->dev->of_node);
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+ if (ep_count <= 0) {
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+ dev_err(dev->dev, "no endpoints connected to panel/bridge\n");
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+ goto out_config;
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+ }
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+ priv->ep_count = ep_count;
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if (priv->bridge) {
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struct drm_encoder *encoder = &priv->encoder;
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@@ -121,6 +127,7 @@ static int vdu_modeset_init(struct drm_device *dev)
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goto out_config;
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}
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} else if (priv->panel) {
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+ dev_dbg(dev->dev, "panel has %d endpoints\n", priv->ep_count);
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ret = baikal_vdu_lvds_connector_create(dev);
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if (ret) {
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dev_err(dev->dev, "Failed to create DRM connector\n");
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--
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2.31.1
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