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Commit 656fa22f authored by Eric Anholt's avatar Eric Anholt Committed by Archit Taneja
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drm/vc4: Switch DSI to the panel-bridge layer, and support bridges. 



The newer version of the RPi panel driver is going to be a combination
of a bridge and a panel, but we should also support panels without a
bridge, so the panel-bridge layer lets us do that cleanly.

v2: Drop "dev" argument.

Signed-off-by: default avatarEric Anholt <eric@anholt.net>
Acked-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarArchit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170511183128.25085-2-eric@anholt.net
parent 13dfc054

drivers/gpu/drm/vc4/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ config DRM_VC4 
	select DRM_KMS_HELPER

	select DRM_KMS_CMA_HELPER

	select DRM_GEM_CMA_HELPER

	select DRM_PANEL

	select DRM_PANEL_BRIDGE

	select SND_PCM

	select SND_PCM_ELD

	select SND_SOC_GENERIC_DMAENGINE_PCM

drivers/gpu/drm/vc4/vc4_dsi.c

+20 −134
Original line number Diff line number Diff line
@@ -503,8 +503,8 @@ struct vc4_dsi { 


	struct mipi_dsi_host dsi_host;

	struct drm_encoder *encoder;

	struct drm_connector *connector;

	struct drm_panel *panel;

	struct drm_bridge *bridge;

	bool is_panel_bridge;



	void __iomem *regs;
@@ -605,18 +605,6 @@ to_vc4_dsi_encoder(struct drm_encoder *encoder) 
	return container_of(encoder, struct vc4_dsi_encoder, base.base);

}



/* VC4 DSI connector KMS struct */

struct vc4_dsi_connector {

	struct drm_connector base;

	struct vc4_dsi *dsi;

};



static inline struct vc4_dsi_connector *

to_vc4_dsi_connector(struct drm_connector *connector)

{

	return container_of(connector, struct vc4_dsi_connector, base);

}



#define DSI_REG(reg) { reg, #reg }

static const struct {

	u32 reg;
@@ -724,79 +712,6 @@ int vc4_dsi_debugfs_regs(struct seq_file *m, void *unused) 
}

#endif



static enum drm_connector_status

vc4_dsi_connector_detect(struct drm_connector *connector, bool force)

{

	struct vc4_dsi_connector *vc4_connector =

		to_vc4_dsi_connector(connector);

	struct vc4_dsi *dsi = vc4_connector->dsi;



	if (dsi->panel)

		return connector_status_connected;

	else

		return connector_status_disconnected;

}



static void vc4_dsi_connector_destroy(struct drm_connector *connector)

{

	drm_connector_unregister(connector);

	drm_connector_cleanup(connector);

}



static int vc4_dsi_connector_get_modes(struct drm_connector *connector)

{

	struct vc4_dsi_connector *vc4_connector =

		to_vc4_dsi_connector(connector);

	struct vc4_dsi *dsi = vc4_connector->dsi;



	if (dsi->panel)

		return drm_panel_get_modes(dsi->panel);



	return 0;

}



static const struct drm_connector_funcs vc4_dsi_connector_funcs = {

	.dpms = drm_atomic_helper_connector_dpms,

	.detect = vc4_dsi_connector_detect,

	.fill_modes = drm_helper_probe_single_connector_modes,

	.destroy = vc4_dsi_connector_destroy,

	.reset = drm_atomic_helper_connector_reset,

	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,

	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,

};



static const struct drm_connector_helper_funcs vc4_dsi_connector_helper_funcs = {

	.get_modes = vc4_dsi_connector_get_modes,

};



static struct drm_connector *vc4_dsi_connector_init(struct drm_device *dev,

						    struct vc4_dsi *dsi)

{

	struct drm_connector *connector;

	struct vc4_dsi_connector *dsi_connector;



	dsi_connector = devm_kzalloc(dev->dev, sizeof(*dsi_connector),

				     GFP_KERNEL);

	if (!dsi_connector)

		return ERR_PTR(-ENOMEM);



	connector = &dsi_connector->base;



	dsi_connector->dsi = dsi;



	drm_connector_init(dev, connector, &vc4_dsi_connector_funcs,

			   DRM_MODE_CONNECTOR_DSI);

	drm_connector_helper_add(connector, &vc4_dsi_connector_helper_funcs);



	connector->polled = 0;

	connector->interlace_allowed = 0;

	connector->doublescan_allowed = 0;



	drm_mode_connector_attach_encoder(connector, dsi->encoder);



	return connector;

}



static void vc4_dsi_encoder_destroy(struct drm_encoder *encoder)

{

	drm_encoder_cleanup(encoder);
@@ -894,12 +809,8 @@ static void vc4_dsi_encoder_disable(struct drm_encoder *encoder) 
	struct vc4_dsi *dsi = vc4_encoder->dsi;

	struct device *dev = &dsi->pdev->dev;



	drm_panel_disable(dsi->panel);



	vc4_dsi_ulps(dsi, true);



	drm_panel_unprepare(dsi->panel);



	clk_disable_unprepare(dsi->pll_phy_clock);

	clk_disable_unprepare(dsi->escape_clock);

	clk_disable_unprepare(dsi->pixel_clock);
@@ -984,12 +895,6 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder) 
		return;

	}



	ret = drm_panel_prepare(dsi->panel);

	if (ret) {

		DRM_ERROR("Panel failed to prepare\n");

		return;

	}



	if (debug_dump_regs) {

		DRM_INFO("DSI regs before:\n");

		vc4_dsi_dump_regs(dsi);
@@ -1211,13 +1116,6 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder) 
		DRM_INFO("DSI regs after:\n");

		vc4_dsi_dump_regs(dsi);

	}



	ret = drm_panel_enable(dsi->panel);

	if (ret) {

		DRM_ERROR("Panel failed to enable\n");

		drm_panel_unprepare(dsi->panel);

		return;

	}

}



static ssize_t vc4_dsi_host_transfer(struct mipi_dsi_host *host,
@@ -1415,17 +1313,22 @@ static int vc4_dsi_host_attach(struct mipi_dsi_host *host, 
		return 0;

	}



	dsi->panel = of_drm_find_panel(device->dev.of_node);

	if (!dsi->panel)

		return 0;

	dsi->bridge = of_drm_find_bridge(device->dev.of_node);

	if (!dsi->bridge) {

		struct drm_panel *panel =

			of_drm_find_panel(device->dev.of_node);



	ret = drm_panel_attach(dsi->panel, dsi->connector);

	if (ret != 0)

		dsi->bridge = drm_panel_bridge_add(panel,

						   DRM_MODE_CONNECTOR_DSI);

		if (IS_ERR(dsi->bridge)) {

			ret = PTR_ERR(dsi->bridge);

			dsi->bridge = NULL;

			return ret;

		}

		dsi->is_panel_bridge = true;

	}



	drm_helper_hpd_irq_event(dsi->connector->dev);



	return 0;

	return drm_bridge_attach(dsi->encoder, dsi->bridge, NULL);

}



static int vc4_dsi_host_detach(struct mipi_dsi_host *host,
@@ -1433,15 +1336,9 @@ static int vc4_dsi_host_detach(struct mipi_dsi_host *host, 
{

	struct vc4_dsi *dsi = host_to_dsi(host);



	if (dsi->panel) {

		int ret = drm_panel_detach(dsi->panel);



		if (ret)

			return ret;



		dsi->panel = NULL;



		drm_helper_hpd_irq_event(dsi->connector->dev);

	if (dsi->is_panel_bridge) {

		drm_panel_bridge_remove(dsi->bridge);

		dsi->bridge = NULL;

	}



	return 0;
@@ -1708,12 +1605,6 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data) 
			 DRM_MODE_ENCODER_DSI, NULL);

	drm_encoder_helper_add(dsi->encoder, &vc4_dsi_encoder_helper_funcs);



	dsi->connector = vc4_dsi_connector_init(drm, dsi);

	if (IS_ERR(dsi->connector)) {

		ret = PTR_ERR(dsi->connector);

		goto err_destroy_encoder;

	}



	dsi->dsi_host.ops = &vc4_dsi_host_ops;

	dsi->dsi_host.dev = dev;
@@ -1724,11 +1615,6 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data) 
	pm_runtime_enable(dev);



	return 0;



err_destroy_encoder:

	vc4_dsi_encoder_destroy(dsi->encoder);



	return ret;

}



static void vc4_dsi_unbind(struct device *dev, struct device *master,
@@ -1740,7 +1626,7 @@ static void vc4_dsi_unbind(struct device *dev, struct device *master, 


	pm_runtime_disable(dev);



	vc4_dsi_connector_destroy(dsi->connector);

	drm_bridge_remove(dsi->bridge);

	vc4_dsi_encoder_destroy(dsi->encoder);



	mipi_dsi_host_unregister(&dsi->dsi_host);