linux-kernel - [PATCH v4 3/7] drm/vkms: Provide platform data when creating VKMS devices

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Message-ID: <20230824084350.1062579-4-brpol@chromium.org>
Date:   Thu, 24 Aug 2023 08:40:34 +0000
From:   Brandon Pollack <brpol@...omium.org>
To:     marius.vlad@...labora.com, jshargo@...omium.org
Cc:     corbet@....net, dri-devel@...ts.freedesktop.org,
        hamohammed.sa@...il.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, mairacanal@...eup.net,
        melissa.srw@...il.com, mripard@...nel.org,
        rodrigosiqueiramelo@...il.com, tzimmermann@...e.de,
        airlied@...il.com, daniel@...ll.ch,
        maarten.lankhorst@...ux.intel.com, mduggan@...omium.org,
        hirono@...omium.org, Brandon Pollack <brpol@...omium.org>
Subject: [PATCH v4 3/7] drm/vkms: Provide platform data when creating VKMS devices

From: Jim Shargo <jshargo@...omium.org>

This is a small refactor to make ConfigFS support easier. This should be
a no-op refactor.

Signed-off-by: Jim Shargo <jshargo@...omium.org>
Signed-off-by: Brandon Pollack <brpol@...omium.org>
---
 drivers/gpu/drm/vkms/vkms_drv.c    | 14 ++++++++++++--
 drivers/gpu/drm/vkms/vkms_drv.h    |  9 ++++++---
 drivers/gpu/drm/vkms/vkms_output.c |  2 +-
 3 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 65b1e2c52106..6c94c2b5d529 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -9,6 +9,7 @@
  * the GPU in DRM API tests.
  */
 
+#include "asm-generic/errno-base.h"
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -171,12 +172,14 @@ static int vkms_modeset_init(struct vkms_device *vkmsdev)
 	dev->mode_config.preferred_depth = 0;
 	dev->mode_config.helper_private = &vkms_mode_config_helpers;
 
-	return vkms_output_init(vkmsdev, 0);
+	return vkmsdev->is_default ? vkms_output_init_default(vkmsdev) :
+				     -EINVAL;
 }
 
 static int vkms_platform_probe(struct platform_device *pdev)
 {
 	int ret;
+	struct vkms_device_setup *vkms_device_setup = pdev->dev.platform_data;
 	struct vkms_device *vkms_device;
 	void *grp;
 
@@ -195,6 +198,7 @@ static int vkms_platform_probe(struct platform_device *pdev)
 	vkms_device->config.cursor = enable_cursor;
 	vkms_device->config.writeback = enable_writeback;
 	vkms_device->config.overlay = enable_overlay;
+	vkms_device->is_default = vkms_device_setup->is_default;
 
 	ret = dma_coerce_mask_and_coherent(vkms_device->drm.dev,
 					   DMA_BIT_MASK(64));
@@ -258,6 +262,9 @@ static int __init vkms_init(void)
 {
 	int ret;
 	struct platform_device *pdev;
+	struct vkms_device_setup vkms_device_setup = {
+		.is_default = true,
+	};
 
 	ret = platform_driver_register(&vkms_platform_driver);
 	if (ret) {
@@ -265,8 +272,11 @@ static int __init vkms_init(void)
 		return ret;
 	}
 
-	pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
+	pdev = platform_device_register_data(NULL, DRIVER_NAME, 0,
+					     &vkms_device_setup,
+					     sizeof(vkms_device_setup));
 	if (IS_ERR(pdev)) {
+		DRM_ERROR("Unable to register default vkms device\n");
 		platform_driver_unregister(&vkms_platform_driver);
 		return PTR_ERR(pdev);
 	}
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 761cd809617e..4262dcffd7e1 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -132,17 +132,20 @@ struct vkms_output {
 	struct vkms_plane planes[VKMS_MAX_PLANES];
 };
 
-struct vkms_device;
-
 struct vkms_config {
 	bool writeback;
 	bool cursor;
 	bool overlay;
 };
 
+struct vkms_device_setup {
+	bool is_default;
+};
+
 struct vkms_device {
 	struct drm_device drm;
 	struct platform_device *platform;
+	bool is_default;
 	struct vkms_output output;
 	struct vkms_config config;
 };
@@ -166,7 +169,7 @@ struct vkms_crtc *vkms_crtc_init(struct vkms_device *vkmsdev,
 				 struct drm_plane *primary,
 				 struct drm_plane *cursor);
 
-int vkms_output_init(struct vkms_device *vkmsdev, int index);
+int vkms_output_init_default(struct vkms_device *vkmsdev);
 
 struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 				   enum drm_plane_type type);
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index 86faf94f7408..bfc2e2362c6d 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -80,7 +80,7 @@ static struct drm_encoder *vkms_encoder_init(struct vkms_device *vkms_device)
 	return encoder;
 }
 
-int vkms_output_init(struct vkms_device *vkmsdev, int index)
+int vkms_output_init_default(struct vkms_device *vkmsdev)
 {
 	struct vkms_output *output = &vkmsdev->output;
 	struct drm_device *dev = &vkmsdev->drm;
-- 
2.42.0.rc1.204.g551eb34607-goog