lkml.org 
[lkml]   [2023]   [May]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v5 5/6] drm: lcdif: Add multiple encoders and first bridges support
From
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@ew.tq-group.com>
> Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Signed-off-by: Liu Ying <victor.liu@nxp.com>
> ---
> 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@

[...]

\
 
 \ /
  Last update: 2023-05-09 04:15    [W:0.144 / U:3.736 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site