[PATCH 21/49] staging: hikey9xx/gpu: add support for using a reserved CMA memory

[Mauro Carvalho Chehab]

Allocate the framebuffer memory via CMA, as otherwise the
drm driver may not work properly with X11.

Part of the changes here were based on a patch originally
authored by:

	alik <hou.xiaoyong@xxxxxxxxxx>

The original version can be found at:
	https://github.com/Bigcountry907/linux/commit/046e29834ef1c523c73614747377d3660eec3964

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
 .../staging/hikey9xx/gpu/kirin9xx_drm_drv.c   | 36 ++++++-------------
 .../staging/hikey9xx/gpu/kirin9xx_drm_drv.h   |  4 +--
 .../hikey9xx/gpu/kirin9xx_drm_overlay_utils.c | 16 ++-------
 3 files changed, 13 insertions(+), 43 deletions(-)

diff --git a/drivers/staging/hikey9xx/gpu/kirin9xx_drm_drv.c b/drivers/staging/hikey9xx/gpu/kirin9xx_drm_drv.c
index 49f591da1cf7..fee686760c78 100644
--- a/drivers/staging/hikey9xx/gpu/kirin9xx_drm_drv.c
+++ b/drivers/staging/hikey9xx/gpu/kirin9xx_drm_drv.c
@@ -21,6 +21,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -29,13 +30,6 @@
 
 #include "kirin9xx_drm_drv.h"
 
-#ifdef CONFIG_DRM_FBDEV_EMULATION
-static bool fbdev = true;
-MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
-module_param(fbdev, bool, 0600);
-#endif
-
-
 static struct kirin_dc_ops *dc_ops;
 
 static int kirin_drm_kms_cleanup(struct drm_device *dev)
@@ -60,22 +54,7 @@ static void kirin_fbdev_output_poll_changed(struct drm_device *dev)
 
 	dsi_set_output_client(dev);
 
-#ifdef CMA_BUFFER_USED
-	if (priv->fbdev) {
-		DRM_INFO("hotplug_event!!!!!!\n");
-		drm_fbdev_cma_hotplug_event(priv->fbdev);
-	} else {
-		DRM_INFO("cma_init!!!!!!\n");
-		priv->fbdev = drm_fbdev_cma_init(dev, 32,
-				dev->mode_config.num_crtc,
-				dev->mode_config.num_connector);
-		if (IS_ERR(priv->fbdev))
-			priv->fbdev = NULL;
-	}
-#else
-	if (priv->fbdev)
-		drm_fb_helper_hotplug_event(priv->fbdev);
-#endif
+	drm_fb_helper_hotplug_event(priv->fbdev);
 }
 
 static const struct drm_mode_config_funcs kirin_drm_mode_config_funcs = {
@@ -98,7 +77,7 @@ static void kirin_drm_mode_config_init(struct drm_device *dev)
 
 static int kirin_drm_kms_init(struct drm_device *dev)
 {
-	struct kirin_drm_private *priv;
+	struct kirin_drm_private *priv = dev->dev_private;
 	int ret;
 
 	priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
@@ -256,6 +235,7 @@ static int kirin_drm_bind(struct device *dev)
 {
 	struct drm_driver *driver = &kirin_drm_driver;
 	struct drm_device *drm_dev;
+	struct kirin_drm_private *priv;
 	int ret;
 
 	drm_dev = drm_dev_alloc(driver, dev);
@@ -270,6 +250,9 @@ static int kirin_drm_bind(struct device *dev)
 	if (ret)
 		goto err_kms_cleanup;
 
+	drm_fbdev_generic_setup(drm_dev, 32);
+	priv = drm_dev->dev_private;
+
 	/* connectors should be registered after drm device register */
 	ret = kirin_drm_connectors_register(drm_dev);
 	if (ret)
@@ -340,6 +323,7 @@ static int kirin_drm_platform_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	struct component_match *match = NULL;
 	struct device_node *remote;
+	int ret;
 
 	dc_ops = (struct kirin_dc_ops *)of_device_get_match_data(dev);
 	if (!dc_ops) {
@@ -356,9 +340,9 @@ static int kirin_drm_platform_probe(struct platform_device *pdev)
 
 	component_match_add(dev, &match, compare_of, remote);
 
+	if (ret)
+		DRM_ERROR("cma device init failed!");
 	return component_master_add_with_match(dev, &kirin_drm_ops, match);
-
-	return 0;
 }
 
 static int kirin_drm_platform_remove(struct platform_device *pdev)
diff --git a/drivers/staging/hikey9xx/gpu/kirin9xx_drm_drv.h b/drivers/staging/hikey9xx/gpu/kirin9xx_drm_drv.h
index b704f025d64b..261259cb8f5f 100644
--- a/drivers/staging/hikey9xx/gpu/kirin9xx_drm_drv.h
+++ b/drivers/staging/hikey9xx/gpu/kirin9xx_drm_drv.h
@@ -13,6 +13,7 @@
 
 #include <drm/drm_crtc.h>
 #include <drm/drm_drv.h>
+#include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_print.h>
 
@@ -21,8 +22,6 @@
 
 #define MAX_CRTC	2
 
-#define to_kirin_fbdev(x) container_of(x, struct kirin_fbdev, fb_helper)
-
 /* display controller init/cleanup ops */
 struct kirin_dc_ops {
 	int (*init)(struct drm_device *dev);
@@ -32,7 +31,6 @@ struct kirin_dc_ops {
 };
 
 struct kirin_drm_private {
-	struct drm_fb_helper *fb_helper;
 	struct drm_fb_helper *fbdev;
 	struct drm_crtc *crtc[MAX_CRTC];
 };
diff --git a/drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c b/drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c
index 8be5865b615c..2b9672a3d057 100644
--- a/drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c
+++ b/drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c
@@ -1517,15 +1517,10 @@ void hisi_fb_pan_display(struct drm_plane *plane)
 	struct dss_crtc *acrtc = aplane->acrtc;
 	struct dss_hw_ctx *ctx = acrtc->ctx;
 
-#ifndef CMA_BUFFER_USED
-	struct kirin_drm_private *priv = plane->dev->dev_private;
-	struct kirin_fbdev *fbdev = to_kirin_fbdev(priv->fbdev);
-#else
 	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(state->fb, 0);
-#endif
 
 	bool afbcd = false;
-	bool mmu_enable = true;
+	bool mmu_enable = false;
 	dss_rect_ltrb_t rect;
 	u32 bpp;
 	u32 stride;
@@ -1550,14 +1545,7 @@ void hisi_fb_pan_display(struct drm_plane *plane)
 	bpp = fb->format->cpp[0];
 	stride = fb->pitches[0];
 
-#ifndef CMA_BUFFER_USED
-	if (fbdev)
-		display_addr = (u32)fbdev->smem_start + src_y * stride;
-	else
-		DRM_ERROR("fbdev is null? \n");
-#else
 	display_addr = (u32)obj->paddr + src_y * stride;
-#endif
 
 	rect.left = 0;
 	rect.right = src_w - 1;
@@ -1609,7 +1597,7 @@ void hisi_dss_online_play(struct kirin_fbdev *fbdev, struct drm_plane *plane, dr
 	struct dss_hw_ctx *ctx = acrtc->ctx;
 
 	bool afbcd = false;
-	bool mmu_enable = true;
+	bool mmu_enable = false;
 	dss_rect_ltrb_t rect;
 	u32 bpp;
 	u32 stride;
-- 
2.26.2