[PATCH v2] drm/arm/komeda: Remove component framework and add a simple encoder

From: Faiz Abbas
Date: Tue Jul 04 2023 - 12:35:28 EST

The Komeda driver always expects the remote connector node to initialize
an encoder. It uses the component aggregator framework which consists
of component->bind() calls used to initialize the remote encoder and attach
it to the crtc. This makes it incompatible with connector drivers which
implement drm_bridge APIs.

Remove all component framework calls from the komeda driver and declare and
attach an encoder inside komeda_crtc_add().

The remote connector driver has to implement the DRM bridge APIs which
can be used to glue the encoder to the remote connector. Since we
usually pair this with a component encoder that also implements a
drm_bridge, dropping support is not expected to affect users of this
driver.

Signed-off-by: Faiz Abbas <faiz.abbas@xxxxxxx>
---
.../gpu/drm/arm/display/komeda/komeda_crtc.c | 23 +++++++-
.../gpu/drm/arm/display/komeda/komeda_drv.c | 57 ++-----------------
.../gpu/drm/arm/display/komeda/komeda_kms.c | 10 +---
.../gpu/drm/arm/display/komeda/komeda_kms.h | 3 +
4 files changed, 32 insertions(+), 61 deletions(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
index 4cc07d6bb9d82..e5a8a80b173f4 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
@@ -13,6 +13,8 @@
#include <drm/drm_crtc_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <drm/drm_bridge.h>

#include "komeda_dev.h"
#include "komeda_kms.h"
@@ -613,9 +615,11 @@ static int komeda_crtc_add(struct komeda_kms_dev *kms,
struct komeda_crtc *kcrtc)
{
struct drm_crtc *crtc = &kcrtc->base;
+ struct drm_device *base = &kms->base;
+ struct drm_bridge *bridge;
int err;

- err = drm_crtc_init_with_planes(&kms->base, crtc,
+ err = drm_crtc_init_with_planes(base, crtc,
get_crtc_primary(kms, kcrtc), NULL,
&komeda_crtc_funcs, NULL);
if (err)
@@ -625,6 +629,23 @@ static int komeda_crtc_add(struct komeda_kms_dev *kms,

crtc->port = kcrtc->master->of_output_port;

+
+ /* Construct an encoder for each pipeline and attach it to the remote
+ * bridge
+ */
+ kcrtc->encoder.possible_crtcs = drm_crtc_mask(crtc);
+ err = drm_simple_encoder_init(base, &kcrtc->encoder,
+ DRM_MODE_ENCODER_TMDS);
+ if (err)
+ return err;
+
+ bridge = devm_drm_of_get_bridge(base->dev, kcrtc->master->of_node,
+ KOMEDA_OF_PORT_OUTPUT, 0);
+ if (IS_ERR(bridge))
+ return PTR_ERR(bridge);
+
+ err = drm_bridge_attach(&kcrtc->encoder, bridge, NULL, 0);
+
drm_crtc_enable_color_mgmt(crtc, 0, true, KOMEDA_COLOR_LUT_SIZE);

return err;
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
index 9fce4239d4ad4..98e7ca1ad8fe7 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
@@ -7,7 +7,6 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
-#include <linux/component.h>
#include <linux/pm_runtime.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_module.h>
@@ -27,13 +26,11 @@ struct komeda_dev *dev_to_mdev(struct device *dev)
return mdrv ? mdrv->mdev : NULL;
}

-static void komeda_unbind(struct device *dev)
+static int komeda_platform_remove(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
struct komeda_drv *mdrv = dev_get_drvdata(dev);

- if (!mdrv)
- return;
-
komeda_kms_detach(mdrv->kms);

if (pm_runtime_enabled(dev))
@@ -45,10 +42,13 @@ static void komeda_unbind(struct device *dev)

dev_set_drvdata(dev, NULL);
devm_kfree(dev, mdrv);
+
+ return 0;
}

-static int komeda_bind(struct device *dev)
+static int komeda_platform_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
struct komeda_drv *mdrv;
int err;

@@ -88,52 +88,7 @@ static int komeda_bind(struct device *dev)
free_mdrv:
devm_kfree(dev, mdrv);
return err;
-}
-
-static const struct component_master_ops komeda_master_ops = {
- .bind = komeda_bind,
- .unbind = komeda_unbind,
-};

-static void komeda_add_slave(struct device *master,
- struct component_match **match,
- struct device_node *np,
- u32 port, u32 endpoint)
-{
- struct device_node *remote;
-
- remote = of_graph_get_remote_node(np, port, endpoint);
- if (remote) {
- drm_of_component_match_add(master, match, component_compare_of, remote);
- of_node_put(remote);
- }
-}
-
-static int komeda_platform_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct component_match *match = NULL;
- struct device_node *child;
-
- if (!dev->of_node)
- return -ENODEV;
-
- for_each_available_child_of_node(dev->of_node, child) {
- if (of_node_cmp(child->name, "pipeline") != 0)
- continue;
-
- /* add connector */
- komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 0);
- komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 1);
- }
-
- return component_master_add_with_match(dev, &komeda_master_ops, match);
-}
-
-static int komeda_platform_remove(struct platform_device *pdev)
-{
- component_master_del(&pdev->dev, &komeda_master_ops);
- return 0;
}

static const struct of_device_id komeda_of_match[] = {
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
index 451746ebbe713..95eb53c284366 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -4,7 +4,6 @@
* Author: James.Qian.Wang <james.qian.wang@xxxxxxx>
*
*/
-#include <linux/component.h>
#include <linux/interrupt.h>

#include <drm/drm_atomic.h>
@@ -307,17 +306,13 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
if (err)
goto cleanup_mode_config;

- err = component_bind_all(mdev->dev, kms);
- if (err)
- goto cleanup_mode_config;
-
drm_mode_config_reset(drm);

err = devm_request_irq(drm->dev, mdev->irq,
komeda_kms_irq_handler, IRQF_SHARED,
drm->driver->name, drm);
if (err)
- goto free_component_binding;
+ goto cleanup_mode_config;

drm_kms_helper_poll_init(drm);

@@ -329,8 +324,6 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)

free_interrupts:
drm_kms_helper_poll_fini(drm);
-free_component_binding:
- component_unbind_all(mdev->dev, drm);
cleanup_mode_config:
drm_mode_config_cleanup(drm);
komeda_kms_cleanup_private_objs(kms);
@@ -346,7 +339,6 @@ void komeda_kms_detach(struct komeda_kms_dev *kms)
drm_dev_unregister(drm);
drm_kms_helper_poll_fini(drm);
drm_atomic_helper_shutdown(drm);
- component_unbind_all(mdev->dev, drm);
drm_mode_config_cleanup(drm);
komeda_kms_cleanup_private_objs(kms);
drm->dev_private = NULL;
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
index 7339339ef6b87..9b070d504f4ad 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
@@ -85,6 +85,9 @@ struct komeda_crtc {

/** @disable_done: this flip_done is for tracing the disable */
struct completion *disable_done;
+
+ /** @encoder: encoder at the end of the pipeline */
+ struct drm_encoder encoder;
};

/**
--
2.25.1