[PATCH v3 45/50] drm/omap: dpi: Register a drm_bridge

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

In order to integrate with a chain of drm_bridge, the internal DPI
output has to expose its operations through the drm_bridge API.
Register a bridge at initialisation time to do so and remove the
omap_dss_device operations that are now unused.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Changes since v2:

- Unregister bridge if port initialisation fails
---
 drivers/gpu/drm/omapdrm/dss/dpi.c | 197 ++++++++++++++++++------------
 1 file changed, 119 insertions(+), 78 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dpi.c b/drivers/gpu/drm/omapdrm/dss/dpi.c
index c167bd1116ec..e228766f613d 100644
--- a/drivers/gpu/drm/omapdrm/dss/dpi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dpi.c
@@ -21,6 +21,8 @@
 #include <linux/string.h>
 #include <linux/sys_soc.h>
 
+#include <drm/drm_bridge.h>
+
 #include "dss.h"
 #include "omapdss.h"
 
@@ -41,12 +43,10 @@ struct dpi_data {
 	int data_lines;
 
 	struct omap_dss_device output;
+	struct drm_bridge bridge;
 };
 
-static struct dpi_data *dpi_get_data_from_dssdev(struct omap_dss_device *dssdev)
-{
-	return container_of(dssdev, struct dpi_data, output);
-}
+#define drm_bridge_to_dpi(bridge) container_of(bridge, struct dpi_data, bridge)
 
 /* -----------------------------------------------------------------------------
  * Clock Handling and PLL
@@ -354,6 +354,32 @@ static void dpi_config_lcd_manager(struct dpi_data *dpi)
 	dss_mgr_set_lcd_config(&dpi->output, &dpi->mgr_config);
 }
 
+static int dpi_clock_update(struct dpi_data *dpi, unsigned long *clock)
+{
+	int lck_div, pck_div;
+	unsigned long fck;
+	struct dpi_clk_calc_ctx ctx;
+
+	if (dpi->pll) {
+		if (!dpi_pll_clk_calc(dpi, *clock, &ctx))
+			return -EINVAL;
+
+		fck = ctx.pll_cinfo.clkout[ctx.clkout_idx];
+	} else {
+		if (!dpi_dss_clk_calc(dpi, *clock, &ctx))
+			return -EINVAL;
+
+		fck = ctx.fck;
+	}
+
+	lck_div = ctx.dispc_cinfo.lck_div;
+	pck_div = ctx.dispc_cinfo.pck_div;
+
+	*clock = fck / lck_div / pck_div;
+
+	return 0;
+}
+
 static int dpi_verify_pll(struct dss_pll *pll)
 {
 	int r;
@@ -391,29 +417,76 @@ static void dpi_init_pll(struct dpi_data *dpi)
 }
 
 /* -----------------------------------------------------------------------------
- * omap_dss_device Operations
+ * DRM Bridge Operations
  */
 
-static int dpi_connect(struct omap_dss_device *src,
-		       struct omap_dss_device *dst)
+static int dpi_bridge_attach(struct drm_bridge *bridge,
+			     enum drm_bridge_attach_flags flags)
 {
-	struct dpi_data *dpi = dpi_get_data_from_dssdev(dst);
+	struct dpi_data *dpi = drm_bridge_to_dpi(bridge);
+
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
+		return -EINVAL;
 
 	dpi_init_pll(dpi);
 
-	return omapdss_device_connect(dst->dss, dst, dst->next);
+	return drm_bridge_attach(bridge->encoder, dpi->output.next_bridge,
+				 bridge, flags);
 }
 
-static void dpi_disconnect(struct omap_dss_device *src,
-			   struct omap_dss_device *dst)
+static enum drm_mode_status
+dpi_bridge_mode_valid(struct drm_bridge *bridge,
+		       const struct drm_display_mode *mode)
 {
-	omapdss_device_disconnect(dst, dst->next);
+	struct dpi_data *dpi = drm_bridge_to_dpi(bridge);
+	unsigned long clock = mode->clock * 1000;
+	int ret;
+
+	if (mode->hdisplay % 8 != 0)
+		return MODE_BAD_WIDTH;
+
+	if (mode->clock == 0)
+		return MODE_NOCLOCK;
+
+	ret = dpi_clock_update(dpi, &clock);
+	if (ret < 0)
+		return MODE_CLOCK_RANGE;
+
+	return MODE_OK;
 }
 
-static void dpi_display_enable(struct omap_dss_device *dssdev)
+static bool dpi_bridge_mode_fixup(struct drm_bridge *bridge,
+				   const struct drm_display_mode *mode,
+				   struct drm_display_mode *adjusted_mode)
 {
-	struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
-	struct omap_dss_device *out = &dpi->output;
+	struct dpi_data *dpi = drm_bridge_to_dpi(bridge);
+	unsigned long clock = mode->clock * 1000;
+	int ret;
+
+	ret = dpi_clock_update(dpi, &clock);
+	if (ret < 0)
+		return false;
+
+	adjusted_mode->clock = clock / 1000;
+
+	return true;
+}
+
+static void dpi_bridge_mode_set(struct drm_bridge *bridge,
+				 const struct drm_display_mode *mode,
+				 const struct drm_display_mode *adjusted_mode)
+{
+	struct dpi_data *dpi = drm_bridge_to_dpi(bridge);
+
+	mutex_lock(&dpi->lock);
+	dpi->pixelclock = adjusted_mode->clock * 1000;
+	mutex_unlock(&dpi->lock);
+}
+
+static void dpi_bridge_enable(struct drm_bridge *bridge,
+			       struct drm_atomic_state *state)
+{
+	struct dpi_data *dpi = drm_bridge_to_dpi(bridge);
 	int r;
 
 	mutex_lock(&dpi->lock);
@@ -428,7 +501,7 @@ static void dpi_display_enable(struct omap_dss_device *dssdev)
 	if (r)
 		goto err_get_dispc;
 
-	r = dss_dpi_select_source(dpi->dss, dpi->id, out->dispc_channel);
+	r = dss_dpi_select_source(dpi->dss, dpi->id, dpi->output.dispc_channel);
 	if (r)
 		goto err_src_sel;
 
@@ -468,9 +541,10 @@ static void dpi_display_enable(struct omap_dss_device *dssdev)
 	mutex_unlock(&dpi->lock);
 }
 
-static void dpi_display_disable(struct omap_dss_device *dssdev)
+static void dpi_bridge_disable(struct drm_bridge *bridge,
+				struct drm_atomic_state *state)
 {
-	struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
+	struct dpi_data *dpi = drm_bridge_to_dpi(bridge);
 
 	mutex_lock(&dpi->lock);
 
@@ -490,70 +564,32 @@ static void dpi_display_disable(struct omap_dss_device *dssdev)
 	mutex_unlock(&dpi->lock);
 }
 
-static int dpi_check_timings(struct omap_dss_device *dssdev,
-			     struct drm_display_mode *mode)
-{
-	struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
-	int lck_div, pck_div;
-	unsigned long fck;
-	unsigned long pck;
-	struct dpi_clk_calc_ctx ctx;
-	bool ok;
-
-	if (mode->hdisplay % 8 != 0)
-		return -EINVAL;
-
-	if (mode->clock == 0)
-		return -EINVAL;
-
-	if (dpi->pll) {
-		ok = dpi_pll_clk_calc(dpi, mode->clock * 1000, &ctx);
-		if (!ok)
-			return -EINVAL;
-
-		fck = ctx.pll_cinfo.clkout[ctx.clkout_idx];
-	} else {
-		ok = dpi_dss_clk_calc(dpi, mode->clock * 1000, &ctx);
-		if (!ok)
-			return -EINVAL;
-
-		fck = ctx.fck;
-	}
-
-	lck_div = ctx.dispc_cinfo.lck_div;
-	pck_div = ctx.dispc_cinfo.pck_div;
-
-	pck = fck / lck_div / pck_div;
+static const struct drm_bridge_funcs dpi_bridge_funcs = {
+	.attach = dpi_bridge_attach,
+	.mode_valid = dpi_bridge_mode_valid,
+	.mode_fixup = dpi_bridge_mode_fixup,
+	.mode_set = dpi_bridge_mode_set,
+	.atomic_enable = dpi_bridge_enable,
+	.atomic_disable = dpi_bridge_disable,
+};
 
-	mode->clock = pck / 1000;
+static void dpi_bridge_init(struct dpi_data *dpi)
+{
+	dpi->bridge.funcs = &dpi_bridge_funcs;
+	dpi->bridge.of_node = dpi->pdev->dev.of_node;
+	dpi->bridge.type = DRM_MODE_CONNECTOR_DPI;
 
-	return 0;
+	drm_bridge_add(&dpi->bridge);
 }
 
-static void dpi_set_timings(struct omap_dss_device *dssdev,
-			    const struct drm_display_mode *mode)
+static void dpi_bridge_cleanup(struct dpi_data *dpi)
 {
-	struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
-
-	DSSDBG("dpi_set_timings\n");
-
-	mutex_lock(&dpi->lock);
-
-	dpi->pixelclock = mode->clock * 1000;
-
-	mutex_unlock(&dpi->lock);
+	drm_bridge_remove(&dpi->bridge);
 }
 
-static const struct omap_dss_device_ops dpi_ops = {
-	.connect = dpi_connect,
-	.disconnect = dpi_disconnect,
-
-	.enable = dpi_display_enable,
-	.disable = dpi_display_disable,
-
-	.check_timings = dpi_check_timings,
-	.set_timings = dpi_set_timings,
-};
+/* -----------------------------------------------------------------------------
+ * Initialisation and Cleanup
+ */
 
 /*
  * Return a hardcoded channel for the DPI output. This should work for
@@ -597,6 +633,8 @@ static int dpi_init_output_port(struct dpi_data *dpi, struct device_node *port)
 	u32 port_num = 0;
 	int r;
 
+	dpi_bridge_init(dpi);
+
 	of_property_read_u32(port, "reg", &port_num);
 	dpi->id = port_num <= 2 ? port_num : 0;
 
@@ -618,12 +656,13 @@ static int dpi_init_output_port(struct dpi_data *dpi, struct device_node *port)
 	out->type = OMAP_DISPLAY_TYPE_DPI;
 	out->dispc_channel = dpi_get_channel(dpi);
 	out->of_port = port_num;
-	out->ops = &dpi_ops;
 	out->owner = THIS_MODULE;
 
-	r = omapdss_device_init_output(out, NULL);
-	if (r < 0)
+	r = omapdss_device_init_output(out, &dpi->bridge);
+	if (r < 0) {
+		dpi_bridge_cleanup(dpi);
 		return r;
+	}
 
 	omapdss_device_register(out);
 
@@ -637,6 +676,8 @@ static void dpi_uninit_output_port(struct device_node *port)
 
 	omapdss_device_unregister(out);
 	omapdss_device_cleanup_output(out);
+
+	dpi_bridge_cleanup(dpi);
 }
 
 /* -----------------------------------------------------------------------------
-- 
Regards,

Laurent Pinchart

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