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| author | Vineet Gupta <vgupta@synopsys.com> | 2018-06-06 10:20:37 -0700 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2019-02-21 11:03:18 -0800 |
| commit | e494239a007e601448110ac304fe055951f9de3b (patch) | |
| tree | 2814f3f12bddf8a5cda6c50ff5523a5066a03cb9 /arch/arc/kernel/entry-arcv2.S | |
| parent | d5e3c55e01d8b1774b37b4647c30fb22f1d39077 (diff) | |
| download | linux-stable-e494239a007e601448110ac304fe055951f9de3b.tar.gz linux-stable-e494239a007e601448110ac304fe055951f9de3b.tar.bz2 linux-stable-e494239a007e601448110ac304fe055951f9de3b.zip | |
ARCv2: support manual regfile save on interrupts
There's a hardware bug which affects the HSDK platform, triggered by
micro-ops for auto-saving regfile on taken interrupt. The workaround is
to inhibit autosave.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel/entry-arcv2.S')
| -rw-r--r-- | arch/arc/kernel/entry-arcv2.S | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arc/kernel/entry-arcv2.S b/arch/arc/kernel/entry-arcv2.S index cc558a25b8fa..562089d62d9d 100644 --- a/arch/arc/kernel/entry-arcv2.S +++ b/arch/arc/kernel/entry-arcv2.S @@ -209,7 +209,9 @@ restore_regs: ;####### Return from Intr ####### debug_marker_l1: - bbit1.nt r0, STATUS_DE_BIT, .Lintr_ret_to_delay_slot + ; bbit1.nt r0, STATUS_DE_BIT, .Lintr_ret_to_delay_slot + btst r0, STATUS_DE_BIT ; Z flag set if bit clear + bnz .Lintr_ret_to_delay_slot ; branch if STATUS_DE_BIT set .Lisr_ret_fast_path: ; Handle special case #1: (Entry via Exception, Return via IRQ) |