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authorSiarhei Siamashka <siarhei.siamashka@gmail.com>2017-03-06 03:16:53 +0200
committerTom Rini <trini@konsulko.com>2017-03-14 20:40:17 -0400
commit19a75b8cf8d17fffa9493bf3f3e380d76eccd8dd (patch)
tree6a23baf8e4cf02ff764ce0d2d1adf76fe642386c /arch/arm/cpu/armv7
parent7584f2e0fb0f3c1686ab066c43c3279d8c326978 (diff)
arm: omap3: Bring back ARM errata workaround 725233
The workaround for ARM errata 725233 had been lost since commit 45bf05854bc94e (armv7: adapt omap3 to the new cache maintenance framework). Bring it back in order to avoid very difficult to reproduce, but actually encountered in the wild CPU deadlocks when running software rendered X11 desktop on OMAP3530 hardware. Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com> Reviewed-by: Tom Rini <trini@konsulko.com> [trini: Migrate to Kconfig] Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/arm/cpu/armv7')
-rw-r--r--arch/arm/cpu/armv7/start.S13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 7eee54ba70..1a6aee9442 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -270,6 +270,19 @@ skip_errata_430973:
skip_errata_621766:
#endif
+#ifdef CONFIG_ARM_ERRATA_725233
+ cmp r2, #0x21 @ Only on < r2p1 (Cortex A8)
+ bge skip_errata_725233
+
+ mrc p15, 1, r0, c9, c0, 2 @ Read L2ACR
+ orr r0, r0, #(0x1 << 27) @ L2 PLD data forwarding disable
+ push {r1-r5} @ Save the cpu info registers
+ bl v7_arch_cp15_set_l2aux_ctrl
+ pop {r1-r5} @ Restore the cpu info - fall through
+
+skip_errata_725233:
+#endif
+
mov pc, r5 @ back to my caller
ENDPROC(cpu_init_cp15)