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mips: bmips: BCM6358: make sure CBR is correctly set

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[ Upstream commit ce5cdd3b05216b704a704f466fb4c2dff3778caf ]

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>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christian Marangi 2024-06-11 13:35:33 +02:00 • committed by Ksawlii
parent 384ecb8a92
commit c592e3ea02
1 changed files with 2 additions and 1 deletions
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3
arch/mips/bmips/setup.c
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@ -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)