drm/gem: rename struct drm_gem_dma_object.{paddr => dma_addr}

The field paddr of struct drm_gem_dma_object holds a DMA address, which
might actually be a physical address. However, depending on the platform,
it can also be a bus address or a virtual address managed by an IOMMU.

Hence, rename the field to dma_addr, which is more applicable.

In order to do this renaming the following coccinelle script was used:

```
	@@
	struct drm_gem_dma_object *gem;
	@@

	- gem->paddr
	+ gem->dma_addr

	@@
	struct drm_gem_dma_object gem;
	@@

	- gem.paddr
	+ gem.dma_addr

	@exists@
	typedef dma_addr_t;
	symbol paddr;
	@@

	dma_addr_t paddr;
	<...
	- paddr
	+ dma_addr
	...>

	@@
	symbol paddr;
	@@
	dma_addr_t
	- paddr
	+ dma_addr
	;

```

This patch is compile-time tested with:

```
	make ARCH={x86_64,arm,arm64} allyesconfig
	make ARCH={x86_64,arm,arm64} drivers/gpu/drm`
```

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220802000405.949236-5-dakr@redhat.com

1 files changed, 12 insertions, 10 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.c b/drivers/gpu/drm/sun4i/sun4i_frontend.c
index baeeda04691f..799ab7460ae5 100644
--- a/drivers/gpu/drm/sun4i/sun4i_frontend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_frontend.c
@@ -160,7 +160,7 @@ void sun4i_frontend_update_buffer(struct sun4i_frontend *frontend,
 	struct drm_framebuffer *fb = state->fb;
 	unsigned int strides[3] = {};
 
-	dma_addr_t paddr;
+	dma_addr_t dma_addr;
 	bool swap;
 
 	if (fb->modifier == DRM_FORMAT_MOD_ALLWINNER_TILED) {
@@ -221,22 +221,24 @@ void sun4i_frontend_update_buffer(struct sun4i_frontend *frontend,
 	swap = sun4i_frontend_format_chroma_requires_swap(fb->format->format);
 
 	/* Set the physical address of the buffer in memory */
-	paddr = drm_fb_dma_get_gem_addr(fb, state, 0);
-	DRM_DEBUG_DRIVER("Setting buffer #0 address to %pad\n", &paddr);
-	regmap_write(frontend->regs, SUN4I_FRONTEND_BUF_ADDR0_REG, paddr);
+	dma_addr = drm_fb_dma_get_gem_addr(fb, state, 0);
+	DRM_DEBUG_DRIVER("Setting buffer #0 address to %pad\n", &dma_addr);
+	regmap_write(frontend->regs, SUN4I_FRONTEND_BUF_ADDR0_REG, dma_addr);
 
 	if (fb->format->num_planes > 1) {
-		paddr = drm_fb_dma_get_gem_addr(fb, state, swap ? 2 : 1);
-		DRM_DEBUG_DRIVER("Setting buffer #1 address to %pad\n", &paddr);
+		dma_addr = drm_fb_dma_get_gem_addr(fb, state, swap ? 2 : 1);
+		DRM_DEBUG_DRIVER("Setting buffer #1 address to %pad\n",
+				 &dma_addr);
 		regmap_write(frontend->regs, SUN4I_FRONTEND_BUF_ADDR1_REG,
-			     paddr);
+			     dma_addr);
 	}
 
 	if (fb->format->num_planes > 2) {
-		paddr = drm_fb_dma_get_gem_addr(fb, state, swap ? 1 : 2);
-		DRM_DEBUG_DRIVER("Setting buffer #2 address to %pad\n", &paddr);
+		dma_addr = drm_fb_dma_get_gem_addr(fb, state, swap ? 1 : 2);
+		DRM_DEBUG_DRIVER("Setting buffer #2 address to %pad\n",
+				 &dma_addr);
 		regmap_write(frontend->regs, SUN4I_FRONTEND_BUF_ADDR2_REG,
-			     paddr);
+			     dma_addr);
 	}
 }
 EXPORT_SYMBOL(sun4i_frontend_update_buffer);