drm/v3d: Delete v3d_dev->pdev

We already have it in v3d_dev->drm.dev with zero additional pointer
chasing. Personally I don't like duplicated pointers like this
because:
- reviewers need to check whether the pointer is for the same or
different objects if there's multiple
- compilers have an easier time too

To avoid having to pull in some big headers I implemented the casting
function as a macro instead of a static inline. Typechecking thanks to
container_of still assured.

But also a bit a bikeshed, so feel free to ignore.

v2: More parens for v3d_to_pdev macro (checkpatch)
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200415074034.175360-11-daniel.vetter@ffwll.ch

drivers/gpu/drm/v3d/v3d_drv.c

@@ -235,7 +235,7 @@ static int
 map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
 {
 	struct resource *res =
-		platform_get_resource_byname(v3d->pdev, IORESOURCE_MEM, name);
+		platform_get_resource_byname(v3d_to_pdev(v3d), IORESOURCE_MEM, name);
 
 	*regs = devm_ioremap_resource(v3d->drm.dev, res);
 	return PTR_ERR_OR_ZERO(*regs);
@@ -255,7 +255,6 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	if (IS_ERR(v3d))
 		return PTR_ERR(v3d);
 
-	v3d->pdev = pdev;
 	drm = &v3d->drm;
 
 	platform_set_drvdata(pdev, drm);

drivers/gpu/drm/v3d/v3d_drv.h

@@ -46,7 +46,6 @@ struct v3d_dev {
 	int ver;
 	bool single_irq_line;
 
-	struct platform_device *pdev;
 	void __iomem *hub_regs;
 	void __iomem *core_regs[3];
 	void __iomem *bridge_regs;
@@ -128,6 +127,8 @@ v3d_has_csd(struct v3d_dev *v3d)
 	return v3d->ver >= 41;
 }
 
+#define v3d_to_pdev(v3d) to_platform_device((v3d)->drm.dev)
+
 /* The per-fd struct, which tracks the MMU mappings. */
 struct v3d_file_priv {
 	struct v3d_dev *v3d;

drivers/gpu/drm/v3d/v3d_irq.c

@@ -217,7 +217,7 @@ v3d_irq_init(struct v3d_dev *v3d)
 		V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS);
 	V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS);
 
-	irq1 = platform_get_irq(v3d->pdev, 1);
+	irq1 = platform_get_irq(v3d_to_pdev(v3d), 1);
 	if (irq1 == -EPROBE_DEFER)
 		return irq1;
 	if (irq1 > 0) {
@@ -226,7 +226,8 @@ v3d_irq_init(struct v3d_dev *v3d)
 				       "v3d_core0", v3d);
 		if (ret)
 			goto fail;
-		ret = devm_request_irq(v3d->drm.dev, platform_get_irq(v3d->pdev, 0),
+		ret = devm_request_irq(v3d->drm.dev,
+				       platform_get_irq(v3d_to_pdev(v3d), 0),
 				       v3d_hub_irq, IRQF_SHARED,
 				       "v3d_hub", v3d);
 		if (ret)
@@ -234,7 +235,8 @@ v3d_irq_init(struct v3d_dev *v3d)
 	} else {
 		v3d->single_irq_line = true;
 
-		ret = devm_request_irq(v3d->drm.dev, platform_get_irq(v3d->pdev, 0),
+		ret = devm_request_irq(v3d->drm.dev,
+				       platform_get_irq(v3d_to_pdev(v3d), 0),
 				       v3d_irq, IRQF_SHARED,
 				       "v3d", v3d);
 		if (ret)