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SubjectRe: 2.6.32 regression (bisected): Video tearing/glitching with T400 laptops
On Mon, 19 Oct 2009 10:04:37 +0900
Jesse Barnes <jbarnes@virtuousgeek.org> wrote:

> On Thu, 15 Oct 2009 00:02:04 -0400
> Theodore Tso <tytso@mit.edu> wrote:
>
> > On Wed, Oct 14, 2009 at 10:26:45PM -0400, Theodore Tso wrote:
> > >
> > > If I need to live with a display glitch every 5-10 minutes or so
> > > to get better power savings, I'll take it....
> > >
> >
> > While mail reading and composing responses in a tty based mail
> > reader (mutt/emacs -nw), I'm seeing display glitches every 3-5
> > minutes. Each time it's quite minor so it's the sort of thing
> > which is definitely "blink at the wrong time and you'll miss it".
> >
> > Being a battery lifetime freak, I'll definitely take the tradeoff,
> > but given that it occurs even when I'm plugged into AC mains, I
> > could see some users being annoyed by it, and I could see them
> > wanting to be able to switch off the feature when they are on AC,
> > if we find a complete fix.
>
> Ok, hopefully this is the "correct" patch. It works for me, can you
> give it a try?

Here's an even more "final" patchset with some spurious hunks removed.

Thanks,
Jesse
From 4744d54c2cf813ebda8e4362c4361d13edf3cac0 Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@jbarnes-x200.(none)>
Date: Mon, 19 Oct 2009 10:08:17 +0900
Subject: [PATCH 1/2] drm/i915: enable self-refresh on 965

Need to calculate the SR watermark and enable it.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 31 +++++++++++++++++++++++++++----
2 files changed, 28 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0466ddb..0bdd711 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1790,6 +1790,7 @@
#define DSPARB_AEND_SHIFT 0

#define DSPFW1 0x70034
+#define DSPFW_SR_SHIFT 23
#define DSPFW2 0x70038
#define DSPFW3 0x7003c
#define IGD_SELF_REFRESH_EN (1<<30)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a0f6bbe..7a18cbb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2445,15 +2445,38 @@ static void g4x_update_wm(struct drm_device *dev, int unused, int unused2,
I915_WRITE(FW_BLC_SELF, fw_blc_self);
}

-static void i965_update_wm(struct drm_device *dev, int unused, int unused2,
- int unused3, int unused4)
+static void i965_update_wm(struct drm_device *dev, int planea_clock,
+ int planeb_clock, int sr_hdisplay, int pixel_size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
+ unsigned long line_time_us;
+ int sr_clock, sr_entries, srwm = 1;
+
+ /* Calc sr entries for one plane configs */
+ if (sr_hdisplay && (!planea_clock || !planeb_clock)) {
+ /* self-refresh has much higher latency */
+ const static int sr_latency_ns = 12000;
+
+ sr_clock = planea_clock ? planea_clock : planeb_clock;
+ line_time_us = ((sr_hdisplay * 1000) / sr_clock);
+
+ /* Use ns/us then divide to preserve precision */
+ sr_entries = (((sr_latency_ns / line_time_us) + 1) *
+ pixel_size * sr_hdisplay) / 1000;
+ sr_entries = roundup(sr_entries / I915_FIFO_LINE_SIZE, 1);
+ DRM_DEBUG("self-refresh entries: %d\n", sr_entries);
+ srwm = I945_FIFO_SIZE - sr_entries;
+ if (srwm < 0)
+ srwm = 1;
+ srwm &= 0x3f;
+ I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN);
+ }

- DRM_DEBUG("Setting FIFO watermarks - A: 8, B: 8, C: 8, SR 8\n");
+ DRM_DEBUG("Setting FIFO watermarks - A: 8, B: 8, C: 8, SR %d\n", srwm);

/* 965 has limitations... */
- I915_WRITE(DSPFW1, (8 << 16) | (8 << 8) | (8 << 0));
+ I915_WRITE(DSPFW1, (srwm << DSPFW_SR_SHIFT) | (8 << 16) | (8 << 8) |
+ (8 << 0));
I915_WRITE(DSPFW2, (8 << 8) | (8 << 0));
}

--
1.6.3.3
From 8133f2e34daefea6b54932af8626d3cf3f3c5b0f Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@jbarnes-x200.(none)>
Date: Mon, 19 Oct 2009 10:09:33 +0900
Subject: [PATCH 2/2] drm/i915: add FIFO watermark support for G4x

Turns out G4x needs to have sensible watermarks set, especially for
self-refresh enabled modes. Add support for it.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
drivers/gpu/drm/i915/i915_reg.h | 11 +++++
drivers/gpu/drm/i915/intel_display.c | 80 ++++++++++++++++++++++++++++++---
2 files changed, 83 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0bdd711..a4d791d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1791,17 +1791,28 @@

#define DSPFW1 0x70034
#define DSPFW_SR_SHIFT 23
+#define DSPFW_CURSORB_SHIFT 16
+#define DSPFW_PLANEB_SHIFT 8
#define DSPFW2 0x70038
+#define DSPFW_CURSORA_MASK 0x00003f00
+#define DSPFW_CURSORA_SHIFT 16
#define DSPFW3 0x7003c
+#define DSPFW_HPLL_SR_EN (1<<31)
+#define DSPFW_CURSOR_SR_SHIFT 24
#define IGD_SELF_REFRESH_EN (1<<30)

/* FIFO watermark sizes etc */
+#define G4X_FIFO_LINE_SIZE 64
#define I915_FIFO_LINE_SIZE 64
#define I830_FIFO_LINE_SIZE 32
+
+#define G4X_FIFO_SIZE 127
#define I945_FIFO_SIZE 127 /* 945 & 965 */
#define I915_FIFO_SIZE 95
#define I855GM_FIFO_SIZE 127 /* In cachelines */
#define I830_FIFO_SIZE 95
+
+#define G4X_MAX_WM 0x3f
#define I915_MAX_WM 0x3f

#define IGD_DISPLAY_FIFO 512 /* in 64byte unit */
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 7a18cbb..5419cab 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2142,6 +2142,13 @@ static struct intel_watermark_params igd_cursor_hplloff_wm = {
IGD_CURSOR_GUARD_WM,
IGD_FIFO_LINE_SIZE
};
+static struct intel_watermark_params g4x_wm_info = {
+ G4X_FIFO_SIZE,
+ G4X_MAX_WM,
+ G4X_MAX_WM,
+ 2,
+ G4X_FIFO_LINE_SIZE,
+};
static struct intel_watermark_params i945_wm_info = {
I945_FIFO_SIZE,
I915_MAX_WM,
@@ -2432,17 +2439,74 @@ static int i830_get_fifo_size(struct drm_device *dev, int plane)
return size;
}

-static void g4x_update_wm(struct drm_device *dev, int unused, int unused2,
- int unused3, int unused4)
+static void g4x_update_wm(struct drm_device *dev, int planea_clock,
+ int planeb_clock, int sr_hdisplay, int pixel_size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- u32 fw_blc_self = I915_READ(FW_BLC_SELF);
+ int total_size, cacheline_size;
+ int planea_wm, planeb_wm, cursora_wm, cursorb_wm, cursor_sr;
+ struct intel_watermark_params planea_params, planeb_params;
+ unsigned long line_time_us;
+ int sr_clock, sr_entries = 0, entries_required;

- if (i915_powersave)
- fw_blc_self |= FW_BLC_SELF_EN;
- else
- fw_blc_self &= ~FW_BLC_SELF_EN;
- I915_WRITE(FW_BLC_SELF, fw_blc_self);
+ /* Create copies of the base settings for each pipe */
+ planea_params = planeb_params = g4x_wm_info;
+
+ /* Grab a couple of global values before we overwrite them */
+ total_size = planea_params.fifo_size;
+ cacheline_size = planea_params.cacheline_size;
+
+ /*
+ * Note: we need to make sure we don't overflow for various clock &
+ * latency values.
+ * clocks go from a few thousand to several hundred thousand.
+ * latency is usually a few thousand
+ */
+ entries_required = ((planea_clock / 1000) * pixel_size * latency_ns) /
+ 1000;
+ entries_required /= G4X_FIFO_LINE_SIZE;
+ planea_wm = entries_required + planea_params.guard_size;
+
+ entries_required = ((planeb_clock / 1000) * pixel_size * latency_ns) /
+ 1000;
+ entries_required /= G4X_FIFO_LINE_SIZE;
+ planeb_wm = entries_required + planeb_params.guard_size;
+
+ cursora_wm = cursorb_wm = 16;
+ cursor_sr = 32;
+
+ DRM_DEBUG("FIFO watermarks - A: %d, B: %d\n", planea_wm, planeb_wm);
+
+ /* Calc sr entries for one plane configs */
+ if (sr_hdisplay && (!planea_clock || !planeb_clock)) {
+ /* self-refresh has much higher latency */
+ const static int sr_latency_ns = 12000;
+
+ sr_clock = planea_clock ? planea_clock : planeb_clock;
+ line_time_us = ((sr_hdisplay * 1000) / sr_clock);
+
+ /* Use ns/us then divide to preserve precision */
+ sr_entries = (((sr_latency_ns / line_time_us) + 1) *
+ pixel_size * sr_hdisplay) / 1000;
+ sr_entries = roundup(sr_entries / cacheline_size, 1);
+ DRM_DEBUG("self-refresh entries: %d\n", sr_entries);
+ I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN);
+ }
+
+ DRM_DEBUG("Setting FIFO watermarks - A: %d, B: %d, SR %d\n",
+ planea_wm, planeb_wm, sr_entries);
+
+ planea_wm &= 0x3f;
+ planeb_wm &= 0x3f;
+
+ I915_WRITE(DSPFW1, (sr_entries << DSPFW_SR_SHIFT) |
+ (cursorb_wm << DSPFW_CURSORB_SHIFT) |
+ (planeb_wm << DSPFW_PLANEB_SHIFT) | planea_wm);
+ I915_WRITE(DSPFW2, (I915_READ(DSPFW2) & DSPFW_CURSORA_MASK) |
+ (cursora_wm << DSPFW_CURSORA_SHIFT));
+ /* HPLL off in SR has some issues on G4x... disable it */
+ I915_WRITE(DSPFW3, (I915_READ(DSPFW3) & ~DSPFW_HPLL_SR_EN) |
+ (cursor_sr << DSPFW_CURSOR_SR_SHIFT));
}

static void i965_update_wm(struct drm_device *dev, int planea_clock,
--
1.6.3.3
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