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Subject[PATCH 5.0 159/238] powerpc/83xx: Also save/restore SPRG4-7 during suspend
Date
5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe Leroy <christophe.leroy@c-s.fr>

commit 36da5ff0bea2dc67298150ead8d8471575c54c7d upstream.

The 83xx has 8 SPRG registers and uses at least SPRG4
for DTLB handling LRU.

Fixes: 2319f1239592 ("powerpc/mm: e300c2/c3/c4 TLB errata workaround")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/powerpc/platforms/83xx/suspend-asm.S | 34 +++++++++++++++++++++++-------
1 file changed, 27 insertions(+), 7 deletions(-)

--- a/arch/powerpc/platforms/83xx/suspend-asm.S
+++ b/arch/powerpc/platforms/83xx/suspend-asm.S
@@ -26,13 +26,13 @@
#define SS_MSR 0x74
#define SS_SDR1 0x78
#define SS_LR 0x7c
-#define SS_SPRG 0x80 /* 4 SPRGs */
-#define SS_DBAT 0x90 /* 8 DBATs */
-#define SS_IBAT 0xd0 /* 8 IBATs */
-#define SS_TB 0x110
-#define SS_CR 0x118
-#define SS_GPREG 0x11c /* r12-r31 */
-#define STATE_SAVE_SIZE 0x16c
+#define SS_SPRG 0x80 /* 8 SPRGs */
+#define SS_DBAT 0xa0 /* 8 DBATs */
+#define SS_IBAT 0xe0 /* 8 IBATs */
+#define SS_TB 0x120
+#define SS_CR 0x128
+#define SS_GPREG 0x12c /* r12-r31 */
+#define STATE_SAVE_SIZE 0x17c

.section .data
.align 5
@@ -103,6 +103,16 @@ _GLOBAL(mpc83xx_enter_deep_sleep)
stw r7, SS_SPRG+12(r3)
stw r8, SS_SDR1(r3)

+ mfspr r4, SPRN_SPRG4
+ mfspr r5, SPRN_SPRG5
+ mfspr r6, SPRN_SPRG6
+ mfspr r7, SPRN_SPRG7
+
+ stw r4, SS_SPRG+16(r3)
+ stw r5, SS_SPRG+20(r3)
+ stw r6, SS_SPRG+24(r3)
+ stw r7, SS_SPRG+28(r3)
+
mfspr r4, SPRN_DBAT0U
mfspr r5, SPRN_DBAT0L
mfspr r6, SPRN_DBAT1U
@@ -493,6 +503,16 @@ mpc83xx_deep_resume:
mtspr SPRN_IBAT7U, r6
mtspr SPRN_IBAT7L, r7

+ lwz r4, SS_SPRG+16(r3)
+ lwz r5, SS_SPRG+20(r3)
+ lwz r6, SS_SPRG+24(r3)
+ lwz r7, SS_SPRG+28(r3)
+
+ mtspr SPRN_SPRG4, r4
+ mtspr SPRN_SPRG5, r5
+ mtspr SPRN_SPRG6, r6
+ mtspr SPRN_SPRG7, r7
+
lwz r4, SS_SPRG+0(r3)
lwz r5, SS_SPRG+4(r3)
lwz r6, SS_SPRG+8(r3)

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