Re: [Intel-gfx] [PATCH 12/12] drm/i915: Disable DDR DVFS on CHV

2015-03-09 Thread Daniel Vetter
On Mon, Mar 09, 2015 at 05:00:09PM +0200, Ville Syrjälä wrote: > On Mon, Mar 09, 2015 at 10:14:05AM +0530, Arun R Murthy wrote: > > > > On Friday 06 March 2015 12:49 AM, ville.syrj...@linux.intel.com wrote: > > > From: Ville Syrjälä > > > > > > DDR DVFS introduces massive memory latencies which c

Re: [Intel-gfx] [PATCH 12/12] drm/i915: Disable DDR DVFS on CHV

2015-03-09 Thread Ville Syrjälä
On Mon, Mar 09, 2015 at 10:14:05AM +0530, Arun R Murthy wrote: > > On Friday 06 March 2015 12:49 AM, ville.syrj...@linux.intel.com wrote: > > From: Ville Syrjälä > > > > DDR DVFS introduces massive memory latencies which can't be handled by > > the PND deadline stuff. Instead the watermarks will

Re: [Intel-gfx] [PATCH 12/12] drm/i915: Disable DDR DVFS on CHV

2015-03-08 Thread Arun R Murthy
On Friday 06 March 2015 12:49 AM, ville.syrj...@linux.intel.com wrote: From: Ville Syrjälä DDR DVFS introduces massive memory latencies which can't be handled by the PND deadline stuff. Instead the watermarks will need to be programmed to compensate for the latency and the deadlines will need

Re: [Intel-gfx] [PATCH 12/12] drm/i915: Disable DDR DVFS on CHV

2015-03-06 Thread Jesse Barnes
On 03/05/2015 11:19 AM, ville.syrj...@linux.intel.com wrote: > From: Ville Syrjälä > > DDR DVFS introduces massive memory latencies which can't be handled by > the PND deadline stuff. Instead the watermarks will need to be > programmed to compensate for the latency and the deadlines will need to

[Intel-gfx] [PATCH 12/12] drm/i915: Disable DDR DVFS on CHV

2015-03-05 Thread ville . syrjala
From: Ville Syrjälä DDR DVFS introduces massive memory latencies which can't be handled by the PND deadline stuff. Instead the watermarks will need to be programmed to compensate for the latency and the deadlines will need to be programmed to tight fixed values. That means DDR DVFS can only be en