openwrt/target/linux/brcm2708/patches-4.19/950-0495-Revert-video-bcm2708_fb-Try-allocating-on-the-ARM-an.patch

From dfe9e42ef9bce3edba84cab22269995f8edd02a5 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Mon, 13 May 2019 17:34:29 +0100
Subject: [PATCH 495/703] Revert "video: bcm2708_fb: Try allocating on the ARM
 and passing to VPU"

This reverts commit ca36c709fce57e8023d2b8b354376bf161601a49.

The driver tries a cma_alloc to avoid using gpu_mem, but should
that fail the core code is logging an error with no easy way to
test whether it will succeed or fail first.

Revert until we either totally give up on gpu_mem and increase
CMA always, or find a way to try an allocation.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
 drivers/video/fbdev/bcm2708_fb.c           | 102 +++------------------
 include/soc/bcm2835/raspberrypi-firmware.h |   1 -
 2 files changed, 12 insertions(+), 91 deletions(-)

--- a/drivers/video/fbdev/bcm2708_fb.c
+++ b/drivers/video/fbdev/bcm2708_fb.c
@@ -98,11 +98,6 @@ struct bcm2708_fb {
 	struct bcm2708_fb_stats stats;
 	unsigned long fb_bus_address;
 	struct { u32 base, length; } gpu;
-
-	bool disable_arm_alloc;
-	unsigned int image_size;
-	dma_addr_t dma_addr;
-	void *cpuaddr;
 };
 
 #define to_bcm2708(info)	container_of(info, struct bcm2708_fb, fb)
@@ -288,88 +283,23 @@ static int bcm2708_fb_set_par(struct fb_
 			.xoffset = info->var.xoffset,
 			.yoffset = info->var.yoffset,
 		.tag5 = { RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE, 8, 0 },
-			/* base and screen_size will be initialised later */
-		.tag6 = { RPI_FIRMWARE_FRAMEBUFFER_SET_PITCH, 4, 0 },
-			/* pitch will be initialised later */
+			.base = 0,
+			.screen_size = 0,
+		.tag6 = { RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH, 4, 0 },
+			.pitch = 0,
 	};
-	int ret, image_size;
-
+	int ret;
 
 	print_debug("%s(%p) %dx%d (%dx%d), %d, %d\n", __func__, info,
 		    info->var.xres, info->var.yres, info->var.xres_virtual,
 		    info->var.yres_virtual, (int)info->screen_size,
 		    info->var.bits_per_pixel);
 
-	/* Try allocating our own buffer. We can specify all the parameters */
-	image_size = ((info->var.xres * info->var.yres) *
-		      info->var.bits_per_pixel) >> 3;
-
-	if (!fb->disable_arm_alloc &&
-	    (image_size != fb->image_size || !fb->dma_addr)) {
-		if (fb->dma_addr) {
-			dma_free_coherent(info->device, fb->image_size,
-					  fb->cpuaddr, fb->dma_addr);
-			fb->image_size = 0;
-			fb->cpuaddr = NULL;
-			fb->dma_addr = 0;
-		}
-
-		fb->cpuaddr = dma_alloc_coherent(info->device, image_size,
-						 &fb->dma_addr, GFP_KERNEL);
-
-		if (!fb->cpuaddr) {
-			fb->dma_addr = 0;
-			fb->disable_arm_alloc = true;
-		} else {
-			fb->image_size = image_size;
-		}
-	}
-
-	if (fb->cpuaddr) {
-		fbinfo.base = fb->dma_addr;
-		fbinfo.screen_size = image_size;
-		fbinfo.pitch = (info->var.xres * info->var.bits_per_pixel) >> 3;
-
-		ret = rpi_firmware_property_list(fb->fw, &fbinfo,
-						 sizeof(fbinfo));
-		if (ret || fbinfo.base != fb->dma_addr) {
-			/* Firmware either failed, or assigned a different base
-			 * address (ie it doesn't support being passed an FB
-			 * allocation).
-			 * Destroy the allocation, and don't try again.
-			 */
-			dma_free_coherent(info->device, fb->image_size,
-					  fb->cpuaddr, fb->dma_addr);
-			fb->image_size = 0;
-			fb->cpuaddr = NULL;
-			fb->dma_addr = 0;
-			fb->disable_arm_alloc = true;
-		}
-	} else {
-		/* Our allocation failed - drop into the old scheme of
-		 * allocation by the VPU.
-		 */
-		ret = -ENOMEM;
-	}
-
+	ret = rpi_firmware_property_list(fb->fw, &fbinfo, sizeof(fbinfo));
 	if (ret) {
-		/* Old scheme:
-		 * - FRAMEBUFFER_ALLOCATE passes 0 for base and screen_size.
-		 * - GET_PITCH instead of SET_PITCH.
-		 */
-		fbinfo.base = 0;
-		fbinfo.screen_size = 0;
-		fbinfo.tag6.tag = RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH;
-		fbinfo.pitch = 0;
-
-		ret = rpi_firmware_property_list(fb->fw, &fbinfo,
-						 sizeof(fbinfo));
-		if (ret) {
-			dev_err(info->device,
-				"Failed to allocate GPU framebuffer (%d)\n",
-				ret);
-			return ret;
-		}
+		dev_err(info->device,
+			"Failed to allocate GPU framebuffer (%d)\n", ret);
+		return ret;
 	}
 
 	if (info->var.bits_per_pixel <= 8)
@@ -384,17 +314,9 @@ static int bcm2708_fb_set_par(struct fb_
 	fb->fb.fix.smem_start = fbinfo.base;
 	fb->fb.fix.smem_len = fbinfo.pitch * fbinfo.yres_virtual;
 	fb->fb.screen_size = fbinfo.screen_size;
-
-	if (!fb->dma_addr) {
-		if (fb->fb.screen_base)
-			iounmap(fb->fb.screen_base);
-
-		fb->fb.screen_base = ioremap_wc(fbinfo.base,
-						fb->fb.screen_size);
-	} else {
-		fb->fb.screen_base = fb->cpuaddr;
-	}
-
+	if (fb->fb.screen_base)
+		iounmap(fb->fb.screen_base);
+	fb->fb.screen_base = ioremap_wc(fbinfo.base, fb->fb.screen_size);
 	if (!fb->fb.screen_base) {
 		/* the console may currently be locked */
 		console_trylock();
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -128,7 +128,6 @@ enum rpi_firmware_property_tag {
 	RPI_FIRMWARE_FRAMEBUFFER_SET_DEPTH =                  0x00048005,
 	RPI_FIRMWARE_FRAMEBUFFER_SET_PIXEL_ORDER =            0x00048006,
 	RPI_FIRMWARE_FRAMEBUFFER_SET_ALPHA_MODE =             0x00048007,
-	RPI_FIRMWARE_FRAMEBUFFER_SET_PITCH =                  0x00048008,
 	RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_OFFSET =         0x00048009,
 	RPI_FIRMWARE_FRAMEBUFFER_SET_OVERSCAN =               0x0004800a,
 	RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE =                0x0004800b,