linux-kernel - Re: [resend] i915: high power consumption after suspend/resume

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Message-ID: <cb0375e10911061225y1bc29807y5abd67e748ef4164@mail.gmail.com>
Date:	Fri, 6 Nov 2009 15:25:26 -0500
From:	Andrew Lutomirski <luto@....edu>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.sf.net
Subject: Re: [resend] i915: high power consumption after suspend/resume

On Thu, Nov 5, 2009 at 11:28 AM, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> On Wed, 4 Nov 2009 23:00:14 -0500
> Andrew Lutomirski <luto@....edu> wrote:
>> so it looks like it's not a register setting after all.  Maybe my BIOS
>> leaves the renderer in some weird state.
>
> Note that the register dumping tool doesn't capture everything.  If you
> really want to do some detective work you could dump the whole MMIO
> space and compare differences.  You should be able to find definitions
> for many of the reg offsets in the docs at intellinuxgraphics.org,
> maybe there's something we don't dump that's changing and that explains
> your power consumption changes.

Here's the diff for another i915_wedged test.  - is high power and +
is low power.

--- /tmp/regs_pre_wedge	2009-11-06 14:46:44.042345316 -0500
+++ /tmp/regs_post_wedge	2009-11-06 14:47:14.798345239 -0500
@@ -45,8 +45,8 @@
 (II):           PP_DIVISOR: 0x003e7f03
 (II):         PFIT_CONTROL: 0x00000000
 (II):      PFIT_PGM_RATIOS: 0x00000000
-(II):      PORT_HOTPLUG_EN: 0x3e040320
-(II):    PORT_HOTPLUG_STAT: 0x38560800
+(II):      PORT_HOTPLUG_EN: 0x3e040200
+(II):    PORT_HOTPLUG_STAT: 0x38000300
 (II):             DSPACNTR: 0x00000000 (disabled, pipe A)
 (II):           DSPASTRIDE: 0x00000000 (0 bytes)
 (II):              DSPAPOS: 0x00000000 (0, 0)
@@ -179,9 +179,9 @@
 (II):           AUD_CONFIG: 0x00000004
 (II):     AUD_HDMIW_STATUS: 0x00000000
 (II):       AUD_CONV_CHCNT: 0x00000000
-(II):        VIDEO_DIP_CTL: 0x20000602
+(II):        VIDEO_DIP_CTL: 0x20000603
 (II):        AUD_PINW_CNTR: 0x00000140
-(II):          AUD_CNTL_ST: 0x00002042
+(II):          AUD_CNTL_ST: 0x00002063
 (II):          AUD_PIN_CAP: 0x00000094
 (II):         AUD_PINW_CAP: 0x004073bd
 (II):   AUD_PINW_UNSOLRESP: 0x00000000
@@ -2285,8 +2285,8 @@
 00002024: 00000000
 00002028: 00000900
 0000202C: 00000000
-00002030: 00005B10
-00002034: 07205B10
+00002030: 00000000
+00002034: 02000000
 00002038: 02000000
 0000203C: 0001F001
 00002040: 00000000
@@ -2302,7 +2302,7 @@
 00002068: 01000000
 0000206C: FFFFFFFE
 00002070: 0001E000
-00002074: 07205B10
+00002074: 02000000
 00002078: 02005B10
 0000207C: FFFFFFFF
 00002080: 01FFF000
@@ -2316,7 +2316,7 @@
 000020A0: 00028053
 000020A4: 00000000
 000020A8: FFFC5FAE
-000020AC: 00020000
+000020AC: 00000000
 000020B0: 00000000
 000020B4: FFFFFF05
 000020B8: 00000001
@@ -2407,7 +2407,7 @@
 0000220C: 10800001
 00002210: 00000000
 00002214: 00000000
-00002218: 07205B10
+00002218: 02000000
 0000221C: 00000000
 00002220: 00000000
 00002224: 00000000
@@ -2487,8 +2487,8 @@
 0000234C: 00000000
 00002350: 2364819D
 00002354: 00000000
-00002358: 55A00000
-0000235C: 56C9F19D
+00002358: A9000000
+0000235C: 5892DB63
 00002360: 00000000
 00002364: 00000000
 00002368: 00000000
@@ -16935,7 +16935,7 @@
 0001050C: 00000000
 00010510: 00000000
 00010514: 00000000
-00010518: 25280A0B
+00010518: 25270A0B
 0001051C: 00000000
 00010520: 00000000
 00010524: 00000000
@@ -17169,7 +17169,7 @@
 000108B4: 00000024
 000108B8: 00000000
 000108BC: 00000000
-000108C0: 00003B37
+000108C0: 00003937
 000108C4: 00000807
 000108C8: 0000211F
 000108CC: 00000000
@@ -17577,7 +17577,7 @@
 00010F14: 00000000
 00010F18: 00000000
 00010F1C: 00000000
-00010F20: 20024808
+00010F20: 28036A8D
 00010F24: 00000000
 00010F28: 00000000
 00010F2C: 00000000
@@ -17633,9 +17633,9 @@
 00010FF4: 00000000
 00010FF8: 00000000
 00010FFC: 000007D0
-00011000: 0093007A
-00011004: 007C0400
-00011008: 0000007C
+00011000: 0093007F
+00011004: 00FF0000
+00011008: 000000FF
 0001100C: 00000000
 00011010: 80000009
 00011014: 00000000
@@ -17747,7 +17747,7 @@
 000111BC: 00000000
 000111C0: 03030100
 000111C4: 0A030A03
-000111C8: 00000020
+000111C8: 00000021
 000111CC: 00000017
 000111D0: 00000000
 000111D4: 00000000
@@ -17891,9 +17891,9 @@
 000113FC: 00000000
 00011400: 00113300
 00011404: 00000000
-00011408: 0FFEFFFF
+00011408: 00047E7F
 0001140C: 80010880
-00011410: 60002C59
+00011410: 40002C59
 00011414: 24049801
 00011418: 00000000
 0001141C: 00000000
@@ -18068,7 +18068,7 @@
 000116C0: 00000000
 000116C4: 00000000
 000116C8: 00000000
-000116CC: 0000007C
+000116CC: 000000FF
 000116D0: 00000000
 000116D4: 00000400
 000116D8: 00000000
@@ -99621,8 +99621,8 @@
 00061104: 00000000
 00061108: 00000000
 0006110C: 00000000
-00061110: 3E040320
-00061114: 38560800
+00061110: 3E040200
+00061114: 38000300
 00061118: 00000000
 0006111C: 00000000
 00061120: 00000000
@@ -99645,7 +99645,7 @@
 00061164: 00000000
 00061168: 00000000
 0006116C: 00000000
-00061170: 20000602
+00061170: 20000603
 00061174: 00000000
 00061178: 00000000
 0006117C: 00000000
@@ -99705,7 +99705,7 @@
 00061254: 0CF80CF8
 00061258: 00000000
 0006125C: 00000000
-00061260: 00000002
+00061260: 00000003
 00061264: 00000000
 00061268: 00000000
 0006126C: 00000000
@@ -100622,7 +100622,7 @@
 000620A8: 00000001
 000620AC: 00000002
 000620B0: 00000140
-000620B4: 00002042
+000620B4: 00002063
 000620B8: 00000000
 000620BC: 18560010
 000620C0: 00000000
@@ -115937,7 +115937,7 @@
 00070FF4: 00000000
 00070FF8: 00000000
 00070FFC: 00000000
-00071000: 00000172
+00071000: 00000286
 00071004: 834C0384
 00071008: C0000000
 0007100C: 00000000
@@ -115953,9 +115953,9 @@
 00071034: 00000000
 00071038: 00000000
 0007103C: 00000000
-00071040: 0001218C
+00071040: 00012784
 00071044: 00000004
-00071048: 56CAB03B
+00071048: 5893BC94
 0007104C: 4C8BF9B3
 00071050: 00000000
 00071054: 00000000

Here's what the docs say:


2030, 2034: ring buffer head/tail
2074: Active head pointer register
20AC: Interrupt Status Register (ISR)
2218: Reserved
2358, 235C: TIMESTAMP

1xxxx: MCHBAR aperture

61110: PORT_HOTPLU_EN
61114: PORT_HOTPLU_STAT
61170: UDI_IF_CTL (UDI InfoFrame Control)

61260: BLM_HIST_CTL (Image BLM Histogram Control Register)

620B4: Reserved (for High Definition?)

71000: PIPEB_DSL (Pipe B Display Scan Line Count)
71040: PIPEBFRAMEH: Pipe B Frame Count High
71048: Reserved

Any ideas?

Thanks,
Andy
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