diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2018-06-06 19:20:37 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2019-02-21 20:03:18 +0100 |
| commit | e494239a007e601448110ac304fe055951f9de3b (patch) | |
| tree | 2814f3f12bddf8a5cda6c50ff5523a5066a03cb9 /arch/arc/kernel | |
| parent | ARC: uacces: remove lp_start, lp_end from clobber list (diff) | |
| download | linux-e494239a007e601448110ac304fe055951f9de3b.tar.xz linux-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')
| -rw-r--r-- | arch/arc/kernel/entry-arcv2.S | 4 | ||||
| -rw-r--r-- | arch/arc/kernel/intc-arcv2.c | 2 |
2 files changed, 5 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) diff --git a/arch/arc/kernel/intc-arcv2.c b/arch/arc/kernel/intc-arcv2.c index 067ea362fb3e..cf18b3e5a934 100644 --- a/arch/arc/kernel/intc-arcv2.c +++ b/arch/arc/kernel/intc-arcv2.c @@ -49,11 +49,13 @@ void arc_init_IRQ(void) *(unsigned int *)&ictrl = 0; +#ifndef CONFIG_ARC_IRQ_NO_AUTOSAVE ictrl.save_nr_gpr_pairs = 6; /* r0 to r11 (r12 saved manually) */ ictrl.save_blink = 1; ictrl.save_lp_regs = 1; /* LP_COUNT, LP_START, LP_END */ ictrl.save_u_to_u = 0; /* user ctxt saved on kernel stack */ ictrl.save_idx_regs = 1; /* JLI, LDI, EI */ +#endif WRITE_AUX(AUX_IRQ_CTRL, ictrl); |