On 5/8/23 07:57, Liu Ying wrote:
The single LCDIF embedded in i.MX93 SoC may drive multiple displays
simultaneously. Look at LCDIF output port's remote port parents to
find all enabled first bridges. Add an encoder for each found bridge
and attach the bridge to the encoder. This is a preparation for
adding i.MX93 LCDIF support.
Tested-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Acked-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Signed-off-by: Liu Ying <victor.liu@xxxxxxx>
---
v4->v5:
* Rebase upon v6.4-rc1 and resolve a trivial conflict.
* Add Alexander's A-b and T-b tags.
v3->v4:
* Improve warning message when ignoring invalid LCDIF OF endpoint ids.
(Alexander)
v2->v3:
* No change.
v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)
* Drop '!remote ||' from lcdif_attach_bridge(). (Lothar)
* Drop unneeded 'bridges' member from lcdif_drm_private structure.
drivers/gpu/drm/mxsfb/lcdif_drv.c | 68 +++++++++++++++++++++++++++----
drivers/gpu/drm/mxsfb/lcdif_drv.h | 4 +-
drivers/gpu/drm/mxsfb/lcdif_kms.c | 21 ++--------
3 files changed, 66 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index e816f87828fb..cf27b63b1899 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -9,13 +9,16 @@
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
@@ -38,19 +41,68 @@ static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = {
.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};
+static const struct drm_encoder_funcs lcdif_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
{
- struct drm_device *drm = lcdif->drm;
+ struct device *dev = lcdif->drm->dev;
+ struct device_node *ep;
struct drm_bridge *bridge;
int ret;
- bridge = devm_drm_of_get_bridge(drm->dev, drm->dev->of_node, 0, 0);
- if (IS_ERR(bridge))
- return PTR_ERR(bridge);
-
- ret = drm_bridge_attach(&lcdif->encoder, bridge, NULL, 0);
- if (ret)
- return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
+ for_each_endpoint_of_node(dev->of_node, ep) {
+ struct device_node *remote;
+ struct of_endpoint of_ep;
+ struct drm_encoder *encoder;
+
+ remote = of_graph_get_remote_port_parent(ep);
+ if (!of_device_is_available(remote)) {
+ of_node_put(remote);
+ continue;
+ }
+ of_node_put(remote);
+
+ ret = of_graph_parse_endpoint(ep, &of_ep);
+ if (ret < 0) {
+ dev_err(dev, "Failed to parse endpoint %pOF\n", ep);
+ of_node_put(ep);
+ return ret;
+ }
+
+ if (of_ep.id >= MAX_DISPLAYS) {
Can we make the maximum number of displays, or really bridge, specific
to IP instance instead (1 for mx8mp, 3 for mx93) ? If so, then I think
we need to track a list of bridges in some linked list or some such
dynamic structure, which would allow us to get rid of MAX_DISPLAYS macro.
+ dev_warn(dev, "ingoring invalid endpoint id %u\n", of_ep.id);
s@ingoring@ignoring@
[...]
