xf86-video-intel: src/i810_reg.h src/i830_driver.c

[Zhenyu Wang]

 src/i810_reg.h    |    3 +++
 src/i830_driver.c |   19 +++++++++++++++++++
 2 files changed, 22 insertions(+)

New commits:
commit f9c625e1e5ddfff06b38fdd4e596fd8eae5934d5
Author: Zhenyu Wang <zhenyu.z.wang at intel.com>
Date:   Thu Sep 11 15:35:27 2008 +0800

    Disable render standby
    
    Render standby is known to cause possible hang issue on some
    mobile chips, so always disable it.

diff --git a/src/i810_reg.h b/src/i810_reg.h
index 9a85d09..5b90e12 100644
--- a/src/i810_reg.h
+++ b/src/i810_reg.h
@@ -2838,4 +2838,7 @@ typedef enum {
 
 #define PEG_BAND_GAP_DATA	0x14d68
 
+#define MCHBAR_RENDER_STANDBY	0x111B8
+#define RENDER_STANDBY_ENABLE	(1 << 30)
+
 #endif /* _I810_REG_H */
diff --git a/src/i830_driver.c b/src/i830_driver.c
index 491ec5e..bab86a5 100644
--- a/src/i830_driver.c
+++ b/src/i830_driver.c
@@ -3012,6 +3012,23 @@ I830SwapPipes(ScrnInfoPtr pScrn)
    }
 }
 
+static void
+i830_disable_render_standby(ScrnInfoPtr pScrn)
+{
+   I830Ptr pI830 = I830PTR(pScrn);
+   uint32_t render_standby;
+
+   /* Render Standby might cause hang issue, try always disable it.*/
+   if (IS_I965GM(pI830) || IS_GM45(pI830)) {
+       render_standby = INREG(MCHBAR_RENDER_STANDBY);
+       if (render_standby & RENDER_STANDBY_ENABLE) {
+	   xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Disable render standby.\n");
+	   OUTREG(MCHBAR_RENDER_STANDBY,
+		   (render_standby & (~RENDER_STANDBY_ENABLE)));
+       }
+   }
+}
+
 static Bool
 I830ScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
 {
@@ -3291,6 +3308,8 @@ I830ScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
 
    i830_init_bufmgr(pScrn);
 
+   i830_disable_render_standby(pScrn);
+
    DPRINTF(PFX, "assert( if(!I830EnterVT(scrnIndex, 0)) )\n");
 
    if (pI830->accel <= ACCEL_XAA) {