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From: Christian Marangi <ansuelsmth@gmail.com>
To: Hauke Mehrtens <hauke@hauke-m.de>,
	=?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Florian Fainelli <florian.fainelli@broadcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>,
	Christian Marangi <ansuelsmth@gmail.com>,
	=?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>,
	linux-mips@vger.kernel.org,
	devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	=?UTF-8?q?Daniel=20Gonz=C3=A1lez=20Cabanelas?= <dgcbueu@gmail.com>
Subject: [PATCH 1/6] mips: bmips: BCM6358: make sure CBR is correctly set
Date: Fri,  3 May 2024 15:54:01 +0200
Message-ID: <20240503135455.966-2-ansuelsmth@gmail.com>
In-Reply-To: <20240503135455.966-1-ansuelsmth@gmail.com>
References: <20240503135455.966-1-ansuelsmth@gmail.com>
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It was discovered that some device have CBR address set to 0 causing
kernel panic when arch_sync_dma_for_cpu_all is called.

This was notice in situation where the system is booted from TP1 and
BMIPS_GET_CBR() returns 0 instead of a valid address and
!!(read_c0_brcm_cmt_local() & (1 << 31)); not failing.

The current check whether RAC flush should be disabled or not are not
enough hence lets check if CBR is a valid address or not.

Fixes: ab327f8acdf8 ("mips: bmips: BCM6358: disable RAC flush for TP1")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 arch/mips/bmips/setup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/mips/bmips/setup.c b/arch/mips/bmips/setup.c
index ec180ab92eaa..66a8ba19c287 100644
--- a/arch/mips/bmips/setup.c
+++ b/arch/mips/bmips/setup.c
@@ -110,7 +110,8 @@ static void bcm6358_quirks(void)
 	 * RAC flush causes kernel panics on BCM6358 when booting from TP1
 	 * because the bootloader is not initializing it properly.
 	 */
-	bmips_rac_flush_disable = !!(read_c0_brcm_cmt_local() & (1 << 31));
+	bmips_rac_flush_disable = !!(read_c0_brcm_cmt_local() & (1 << 31)) ||
+				  !!BMIPS_GET_CBR();
 }
 
 static void bcm6368_quirks(void)
-- 
2.43.0