drm/mcde: Don't use drm_device->dev_private

Upcasting using a container_of macro is more typesafe, faster and
easier for the compiler to optimize.

v2: Move misplaced removal of double-assignment to this patch (Sam)

Reviewed-by: Linus Walleij <linus.walleij@linaro.org> (v1)
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200415074034.175360-30-daniel.vetter@ffwll.ch

drivers/gpu/drm/mcde/mcde_display.c

@@ -948,7 +948,7 @@ static void mcde_display_disable(struct drm_simple_display_pipe *pipe)
 {
 	struct drm_crtc *crtc = &pipe->crtc;
 	struct drm_device *drm = crtc->dev;
-	struct mcde *mcde = drm->dev_private;
+	struct mcde *mcde = to_mcde(drm);
 	struct drm_pending_vblank_event *event;
 
 	drm_crtc_vblank_off(crtc);
@@ -1020,7 +1020,7 @@ static void mcde_display_update(struct drm_simple_display_pipe *pipe,
 {
 	struct drm_crtc *crtc = &pipe->crtc;
 	struct drm_device *drm = crtc->dev;
-	struct mcde *mcde = drm->dev_private;
+	struct mcde *mcde = to_mcde(drm);
 	struct drm_pending_vblank_event *event = crtc->state->event;
 	struct drm_plane *plane = &pipe->plane;
 	struct drm_plane_state *pstate = plane->state;
@@ -1078,7 +1078,7 @@ static int mcde_display_enable_vblank(struct drm_simple_display_pipe *pipe)
 {
 	struct drm_crtc *crtc = &pipe->crtc;
 	struct drm_device *drm = crtc->dev;
-	struct mcde *mcde = drm->dev_private;
+	struct mcde *mcde = to_mcde(drm);
 	u32 val;
 
 	/* Enable all VBLANK IRQs */
@@ -1097,7 +1097,7 @@ static void mcde_display_disable_vblank(struct drm_simple_display_pipe *pipe)
 {
 	struct drm_crtc *crtc = &pipe->crtc;
 	struct drm_device *drm = crtc->dev;
-	struct mcde *mcde = drm->dev_private;
+	struct mcde *mcde = to_mcde(drm);
 
 	/* Disable all VBLANK IRQs */
 	writel(0, mcde->regs + MCDE_IMSCPP);
@@ -1117,7 +1117,7 @@ static struct drm_simple_display_pipe_funcs mcde_display_funcs = {
 
 int mcde_display_init(struct drm_device *drm)
 {
-	struct mcde *mcde = drm->dev_private;
+	struct mcde *mcde = to_mcde(drm);
 	int ret;
 	static const u32 formats[] = {
 		DRM_FORMAT_ARGB8888,

drivers/gpu/drm/mcde/mcde_drm.h

@@ -34,6 +34,8 @@ struct mcde {
 	struct regulator *vana;
 };
 
+#define to_mcde(dev) container_of(dev, struct mcde, drm)
+
 bool mcde_dsi_irq(struct mipi_dsi_device *mdsi);
 void mcde_dsi_te_request(struct mipi_dsi_device *mdsi);
 extern struct platform_driver mcde_dsi_driver;

drivers/gpu/drm/mcde/mcde_drv.c

@@ -164,7 +164,7 @@ static irqreturn_t mcde_irq(int irq, void *data)
 static int mcde_modeset_init(struct drm_device *drm)
 {
 	struct drm_mode_config *mode_config;
-	struct mcde *mcde = drm->dev_private;
+	struct mcde *mcde = to_mcde(drm);
 	int ret;
 
 	if (!mcde->bridge) {
@@ -311,13 +311,11 @@ static int mcde_probe(struct platform_device *pdev)
 	if (IS_ERR(mcde))
 		return PTR_ERR(mcde);
 	drm = &mcde->drm;
-	drm->dev_private = mcde;
 	mcde->dev = dev;
 	platform_set_drvdata(pdev, drm);
 
 	/* Enable continuous updates: this is what Linux' framebuffer expects */
 	mcde->oneshot_mode = false;
-	drm->dev_private = mcde;
 
 	/* First obtain and turn on the main power */
 	mcde->epod = devm_regulator_get(dev, "epod");
@@ -487,7 +485,7 @@ static int mcde_probe(struct platform_device *pdev)
 static int mcde_remove(struct platform_device *pdev)
 {
 	struct drm_device *drm = platform_get_drvdata(pdev);
-	struct mcde *mcde = drm->dev_private;
+	struct mcde *mcde = to_mcde(drm);
 
 	component_master_del(&pdev->dev, &mcde_drm_comp_ops);
 	clk_disable_unprepare(mcde->mcde_clk);

drivers/gpu/drm/mcde/mcde_dsi.c

@@ -1020,7 +1020,7 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 			 void *data)
 {
 	struct drm_device *drm = data;
-	struct mcde *mcde = drm->dev_private;
+	struct mcde *mcde = to_mcde(drm);
 	struct mcde_dsi *d = dev_get_drvdata(dev);
 	struct device_node *child;
 	struct drm_panel *panel = NULL;