[PATCH xf86-video-cirrus] Save and restore RIF Control and RAC Control registers

[Kevin Brace]

While the standby resume from ACPI S3 State still fails (i.e., hard
system freeze), saving and restoring Rambus RIF (Rambus Interface)
Control and RAC (Rambus ASIC Cell) Control registers prevents weird
artifacts from being displayed after standby resume (i.e., merely a
blank screen after standby resume).

Signed-off-by: Kevin Brace <kevinbrace at gmx.com>
---
 src/lg.h        | 1 +
 src/lg_driver.c | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/src/lg.h b/src/lg.h
index 3f5dcdf..42add0c 100644
--- a/src/lg.h
+++ b/src/lg.h
@@ -44,6 +44,7 @@ typedef struct {
 	/* Laguna regs */
 	CARD8 TILE, BCLK;
 	CARD16 FORMAT, DTTC, TileCtrl, CONTROL;
+	CARD16  RIFCtrl, RACCtrl;
 	CARD32 VSC;
 } LgRegRec, *LgRegPtr;

diff --git a/src/lg_driver.c b/src/lg_driver.c
index 3af8432..f6d721a 100644
--- a/src/lg_driver.c
+++ b/src/lg_driver.c
@@ -1081,6 +1081,12 @@ LgSave(ScrnInfoPtr pScrn)

     pCir->chip.lg->ModeReg.CONTROL =
     pCir->chip.lg->SavedReg.CONTROL = memrw(0x402);
+
+    pCir->chip.lg->ModeReg.RIFCtrl =
+    pCir->chip.lg->SavedReg.RIFCtrl = memrw(0x200);
+
+    pCir->chip.lg->ModeReg.RACCtrl =
+    pCir->chip.lg->SavedReg.RACCtrl = memrw(0x202);
 }

 /*
@@ -1549,6 +1555,9 @@ LgRestoreLgRegs(ScrnInfoPtr pScrn, LgRegPtr lgReg)
         memwb(0x8C, lgReg->BCLK);

     memww(0x402, lgReg->CONTROL);
+
+    memww(0x200, lgReg->RIFCtrl);
+    memww(0x202, lgReg->RACCtrl);
 }

 /*
--
2.17.1