[Maverick,1/1] (pre-stable) drm/i915: don't enable self-refresh on Ironlake

Hi All,

The following upstream patch resolves a screen corruption issue after
unplugging an external monitor attached to the VGA port, see LP Bug
629711.  The patch is included in 2.6.36-rc4 and has been Cc'd to
upstream stable.  The launchpad bug reporter has also confirmed this
patch resolves the issue.  Please consider applying as a pre-stable
patch to Maverick.

Thanks,
Leann     

From ef69f8c9824106309a1c894bb5fe2a7cea81c4bb Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Thu, 9 Sep 2010 11:58:02 -0700
Subject: [PATCH] (pre-stable) drm/i915: don't enable self-refresh on Ironlake

BugLink: http://bugs.launchpad.net/bugs/629711

We don't know how to enable it safely, especially as outputs turn on and
off.  When disabling LP1 we also need to make sure LP2 and 3 are already
disabled.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29173
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29082
Reported-by: Chris Lord <chris@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Tested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@kernel.org
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit dd8849c8f59ec1cee4809a0c5e603e045abe860e)

Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
---
 drivers/gpu/drm/i915/i915_reg.h      |    8 ++++++++
 drivers/gpu/drm/i915/intel_display.c |    6 ++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

Applied to Maverick linux master.

Thanks,
Leann

On Mon, 2010-09-13 at 13:49 -0700, Leann Ogasawara wrote:
> Hi All,
> 
> The following upstream patch resolves a screen corruption issue after
> unplugging an external monitor attached to the VGA port, see LP Bug
> 629711.  The patch is included in 2.6.36-rc4 and has been Cc'd to
> upstream stable.  The launchpad bug reporter has also confirmed this
> patch resolves the issue.  Please consider applying as a pre-stable
> patch to Maverick.
> 
> Thanks,
> Leann     
> 
> From ef69f8c9824106309a1c894bb5fe2a7cea81c4bb Mon Sep 17 00:00:00 2001
> From: Jesse Barnes <jbarnes@virtuousgeek.org>
> Date: Thu, 9 Sep 2010 11:58:02 -0700
> Subject: [PATCH] (pre-stable) drm/i915: don't enable self-refresh on Ironlake
> 
> BugLink: http://bugs.launchpad.net/bugs/629711
> 
> We don't know how to enable it safely, especially as outputs turn on and
> off.  When disabling LP1 we also need to make sure LP2 and 3 are already
> disabled.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29173
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29082
> Reported-by: Chris Lord <chris@linux.intel.com>
> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
> Tested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: stable@kernel.org
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> (cherry picked from commit dd8849c8f59ec1cee4809a0c5e603e045abe860e)
> 
> Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h      |    8 ++++++++
>  drivers/gpu/drm/i915/intel_display.c |    6 ++++--
>  2 files changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index cf41c67..f6dda38 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2199,9 +2199,17 @@
>  #define  WM1_LP_SR_EN		(1<<31)
>  #define  WM1_LP_LATENCY_SHIFT	24
>  #define  WM1_LP_LATENCY_MASK	(0x7f<<24)
> +#define  WM1_LP_FBC_LP1_MASK	(0xf<<20)
> +#define  WM1_LP_FBC_LP1_SHIFT	20
>  #define  WM1_LP_SR_MASK		(0x1ff<<8)
>  #define  WM1_LP_SR_SHIFT	8
>  #define  WM1_LP_CURSOR_MASK	(0x3f)
> +#define WM2_LP_ILK		0x4510c
> +#define  WM2_LP_EN		(1<<31)
> +#define WM3_LP_ILK		0x45110
> +#define  WM3_LP_EN		(1<<31)
> +#define WM1S_LP_ILK		0x45120
> +#define  WM1S_LP_EN		(1<<31)
>  
>  /* Memory latency timer register */
>  #define MLTR_ILK		0x11222
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 48ad60b..9a00dc4 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3176,8 +3176,7 @@ static void ironlake_update_wm(struct drm_device *dev,  int planea_clock,
>  		reg_value = I915_READ(WM1_LP_ILK);
>  		reg_value &= ~(WM1_LP_LATENCY_MASK | WM1_LP_SR_MASK |
>  			       WM1_LP_CURSOR_MASK);
> -		reg_value |= WM1_LP_SR_EN |
> -			     (ilk_sr_latency << WM1_LP_LATENCY_SHIFT) |
> +		reg_value |= (ilk_sr_latency << WM1_LP_LATENCY_SHIFT) |
>  			     (sr_wm << WM1_LP_SR_SHIFT) | cursor_wm;
>  
>  		I915_WRITE(WM1_LP_ILK, reg_value);
> @@ -5395,6 +5394,9 @@ void intel_init_clock_gating(struct drm_device *dev)
>  			I915_WRITE(DISP_ARB_CTL,
>  					(I915_READ(DISP_ARB_CTL) |
>  						DISP_FBC_WM_DIS));
> +		I915_WRITE(WM3_LP_ILK, 0);
> +		I915_WRITE(WM2_LP_ILK, 0);
> +		I915_WRITE(WM1_LP_ILK, 0);
>  		}
>  		return;
>  	} else if (IS_G4X(dev)) {
> -- 
> 1.7.1
> 
> 
> 
>