[CELL] spufs: remove needless context save/restore code

The following steps are not needed in the SPE context save/restore
paths:

Save Step 12: save_mfc_decr()
  save suspend_time to CSA (It will be done by step 14)
  save ch 7 (decrementer value will be saved in LSCSA by spe-side step 10)

Restore Step 59: restore_ch_part1()
  restore ch 1 (it will be done by spe-side step 15)

This change removes the unnecessary steps.

Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

diff --git a/arch/powerpc/platforms/cell/spufs/switch.c b/arch/powerpc/platforms/cell/spufs/switch.c
index 861336e..a08fe93 100644 (file)
--- a/arch/powerpc/platforms/cell/spufs/switch.c
+++ b/arch/powerpc/platforms/cell/spufs/switch.c
@@ -253,11 +253,6 @@ static inline void save_mfc_decr(struct spu_state *csa, struct spu *spu)
         */
        if (in_be64(&priv2->mfc_control_RW) & MFC_CNTL_DECREMENTER_RUNNING) {
                csa->priv2.mfc_control_RW |= MFC_CNTL_DECREMENTER_RUNNING;
-               csa->suspend_time = get_cycles();
-               out_be64(&priv2->spu_chnlcntptr_RW, 7ULL);
-               eieio();
-               csa->spu_chnldata_RW[7] = in_be64(&priv2->spu_chnldata_RW);
-               eieio();
        } else {
                csa->priv2.mfc_control_RW &= ~MFC_CNTL_DECREMENTER_RUNNING;
        }
@@ -1567,13 +1562,8 @@ static inline void restore_ch_part1(struct spu_state *csa, struct spu *spu)
        int i;
 
        /* Restore, Step 59:
+        *      Restore the following CH: [0,3,4,24,25,27]
         */
-
-       /* Restore CH 1 without count */
-       out_be64(&priv2->spu_chnlcntptr_RW, 1);
-       out_be64(&priv2->spu_chnldata_RW, csa->spu_chnldata_RW[1]);
-
-       /* Restore the following CH: [0,3,4,24,25,27] */
        for (i = 0; i < ARRAY_SIZE(ch_indices); i++) {
                idx = ch_indices[i];
                out_be64(&priv2->spu_chnlcntptr_RW, idx);