[POWERPC] spufs: Update SPU_Status[CISHP] in backing runcntl write

Currently, the kernel may fail to restart a SPE context which
has stopped and been swapped out.

This changes spu_backing_runcntl_write to emulate the real
SPU_Status register exactly.  When the SPU Run Control register
is written with SPU_RunCntl[Run] set to '1', the physical SPU
automatically sets SPU_Status[R] and clears SPU_Status[CISHP].

Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/backing_ops.c b/arch/powerpc/platforms/cell/spufs/backing_ops.c
index 50d98a154aaf..64eb15b22040 100644
--- a/arch/powerpc/platforms/cell/spufs/backing_ops.c
+++ b/arch/powerpc/platforms/cell/spufs/backing_ops.c
@@ -288,6 +288,12 @@ static void spu_backing_runcntl_write(struct spu_context *ctx, u32 val)
         spin_lock(&ctx->csa.register_lock);
         ctx->csa.prob.spu_runcntl_RW = val;
         if (val & SPU_RUNCNTL_RUNNABLE) {
+                ctx->csa.prob.spu_status_R &=
+                        ~SPU_STATUS_STOPPED_BY_STOP &
+                        ~SPU_STATUS_STOPPED_BY_HALT &
+                        ~SPU_STATUS_SINGLE_STEP &
+                        ~SPU_STATUS_INVALID_INSTR &
+                        ~SPU_STATUS_INVALID_CH;
                 ctx->csa.prob.spu_status_R |= SPU_STATUS_RUNNING;
         } else {
                 ctx->csa.prob.spu_status_R &= ~SPU_STATUS_RUNNING;