RADEON: tell the bios not to muck with the hardware while the driver is active

by toggling the appropriate bios scratch regs you can tell
the bios not the touch the hw while the driver is active.
This should prevent the bios from scrambling the hardware
when users open the lid or toggle bios hotkeys.

fixes bug 12567

1 files changed, 18 insertions, 0 deletions

diff --git a/src/radeon_crtc.c b/src/radeon_crtc.c
index 47e46f38..ca554d28 100644
--- a/src/radeon_crtc.c
+++ b/src/radeon_crtc.c
@@ -768,6 +768,18 @@ RADEONInitPLL2Registers(ScrnInfoPtr pScrn, RADEONSavePtr save,
 }
 
 static void
+RADEONInitBIOSRegisters(ScrnInfoPtr pScrn, RADEONSavePtr save)
+{
+    RADEONInfoPtr  info      = RADEONPTR(pScrn);
+
+    /* tell the bios not to muck with the hardware on events */
+    save->bios_4_scratch = 0;
+    save->bios_5_scratch = 0xff00;
+    save->bios_6_scratch = info->SavedReg.bios_6_scratch | 0x40000000;
+
+}
+
+static void
 radeon_update_tv_routing(ScrnInfoPtr pScrn, RADEONSavePtr restore)
 {
     /* pixclks_cntl controls tv clock routing */
@@ -813,6 +825,9 @@ radeon_crtc_mode_set(xf86CrtcPtr crtc, DisplayModePtr mode,
 	}
     }
 
+    if (info->IsMobility)
+	RADEONInitBIOSRegisters(pScrn, &info->ModeReg);
+
     ErrorF("init memmap\n");
     RADEONInitMemMapRegisters(pScrn, &info->ModeReg, info);
     ErrorF("init common\n");
@@ -868,6 +883,9 @@ radeon_crtc_mode_set(xf86CrtcPtr crtc, DisplayModePtr mode,
 	}
     }
 
+    if (info->IsMobility)
+	RADEONRestoreBIOSRegisters(pScrn, &info->ModeReg);
+
     ErrorF("restore memmap\n");
     RADEONRestoreMemMapRegisters(pScrn, &info->ModeReg);
     ErrorF("restore common\n");