openwrt/target/linux/bcm27xx/patches-5.4/950-0954-media-bcm2835-unicam-Drop-WARN-on-uing-direct-cache-.patch

From d535074e3e2c08ba5a6b627e54f4597f0f6f9240 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 27 Aug 2020 16:30:26 +0100
Subject: [PATCH] media: bcm2835-unicam: Drop WARN on uing direct
 cache alias

Pi 0&1 pass all ARM accesses through the VPU L2 cache, therefore
the dma-ranges property sets the cache alias bits to other
than the direct alias, hence this WARN was firing.

It was overprotective coding, so assume that everything is OK
with the dma-ranges, and remove the WARN.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/platform/bcm2835/bcm2835-unicam.c | 7 -------
 1 file changed, 7 deletions(-)

--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
@@ -708,13 +708,6 @@ static void unicam_wr_dma_addr(struct un
 {
 	dma_addr_t endaddr = dmaaddr + buffer_size;
 
-	/*
-	 * dmaaddr and endaddr should be a 32-bit address with the top two bits
-	 * set to 0x3 to signify uncached access through the Videocore memory
-	 * controller.
-	 */
-	WARN_ON((dmaaddr >> 30) != 0x3 || (endaddr >> 30) != 0x3);
-
 	if (pad_id == IMAGE_PAD) {
 		reg_write(dev, UNICAM_IBSA0, dmaaddr);
 		reg_write(dev, UNICAM_IBEA0, endaddr);