[RFC PATCH 06/17] drm/exynos: dsi: Handle exynos specifics via driver_data

[Jagan Teki]

Exynos DSI driver is actually a Samsung MIPI DSIM bridge
IP which is also used in i.MX8MM platforms.

Right now the existing driver has some exynos drm specific
code bases like te_irq, crtc and component_ops.

In order to switch this driver into a common bridge driver
We can see 2 options to handle the exynos specific code.

A. Drop the component_ops, and rework other specifics.
   This may lead to more foundation work as it requires
   more changes in exynos drm drivers stack.

B. Handle the exynos specifics via driver data, and make
   the common bridge work in different platforms and plan
   for option A in future.

So, this patch is trying to add option B) changes to handle
exynos specifics via driver_data.

Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 37 +++++++++++++++++++------
 1 file changed, 29 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 99a1b8c22313..53d878d4d2d7 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -250,6 +250,7 @@ struct exynos_dsi_driver_data {
 	unsigned int wait_for_reset;
 	unsigned int num_bits_resol;
 	const unsigned int *reg_values;
+	bool exynos_specific;
 };
 
 struct exynos_dsi {
@@ -459,6 +460,7 @@ static const struct exynos_dsi_driver_data exynos3_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.reg_values = reg_values,
+	.exynos_specific = true,
 };
 
 static const struct exynos_dsi_driver_data exynos4_dsi_driver_data = {
@@ -471,6 +473,7 @@ static const struct exynos_dsi_driver_data exynos4_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.reg_values = reg_values,
+	.exynos_specific = true,
 };
 
 static const struct exynos_dsi_driver_data exynos5_dsi_driver_data = {
@@ -481,6 +484,7 @@ static const struct exynos_dsi_driver_data exynos5_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.reg_values = reg_values,
+	.exynos_specific = true,
 };
 
 static const struct exynos_dsi_driver_data exynos5433_dsi_driver_data = {
@@ -492,6 +496,7 @@ static const struct exynos_dsi_driver_data exynos5433_dsi_driver_data = {
 	.wait_for_reset = 0,
 	.num_bits_resol = 12,
 	.reg_values = exynos5433_reg_values,
+	.exynos_specific = true,
 };
 
 static const struct exynos_dsi_driver_data exynos5422_dsi_driver_data = {
@@ -503,6 +508,7 @@ static const struct exynos_dsi_driver_data exynos5422_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 12,
 	.reg_values = exynos5422_reg_values,
+	.exynos_specific = true,
 };
 
 static const struct of_device_id exynos_dsi_of_match[] = {
@@ -1484,7 +1490,8 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 	 * If attached panel device is for command mode one, dsi should register
 	 * TE interrupt handler.
 	 */
-	if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO)) {
+	if (dsi->driver_data->exynos_specific &&
+	    !(device->mode_flags & MIPI_DSI_MODE_VIDEO)) {
 		int ret = exynos_dsi_register_te_irq(dsi, &device->dev);
 		if (ret)
 			return ret;
@@ -1495,8 +1502,9 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 	dsi->lanes = device->lanes;
 	dsi->format = device->format;
 	dsi->mode_flags = device->mode_flags;
-	exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
-			!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO);
+	if (dsi->driver_data->exynos_specific)
+		exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
+					    !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO);
 
 	mutex_unlock(&drm->mode_config.mutex);
 
@@ -1515,7 +1523,8 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
 	if (drm->mode_config.poll_enabled)
 		drm_kms_helper_hotplug_event(drm);
 
-	exynos_dsi_unregister_te_irq(dsi);
+	if (dsi->driver_data->exynos_specific)
+		exynos_dsi_unregister_te_irq(dsi);
 
 	return 0;
 }
@@ -1737,6 +1746,15 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	if (!dsi->driver_data->exynos_specific) {
+		ret = mipi_dsi_host_register(&dsi->dsi_host);
+		if (ret) {
+			dev_err(dev, "failed to register mipi dsi host: %d\n",
+				ret);
+			return ret;
+		}
+	}
+
 	platform_set_drvdata(pdev, dsi);
 
 	pm_runtime_enable(dev);
@@ -1747,9 +1765,11 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 
 	drm_bridge_add(&dsi->bridge);
 
-	ret = component_add(dev, &exynos_dsi_component_ops);
-	if (ret)
-		goto err_disable_runtime;
+	if (dsi->driver_data->exynos_specific) {
+		ret = component_add(dev, &exynos_dsi_component_ops);
+		if (ret)
+			goto err_disable_runtime;
+	}
 
 	return 0;
 
@@ -1767,7 +1787,8 @@ static int exynos_dsi_remove(struct platform_device *pdev)
 
 	pm_runtime_disable(&pdev->dev);
 
-	component_del(&pdev->dev, &exynos_dsi_component_ops);
+	if (dsi->driver_data->exynos_specific)
+		component_del(&pdev->dev, &exynos_dsi_component_ops);
 
 	return 0;
 }
-- 
2.25.1