[Intel-gfx] [PATCH v4 00/11] Check pixel clock when setting mode

[Mika Kahola]

On Fri, 2015-08-14 at 15:13 +0200, Daniel Vetter wrote:
> On Fri, Aug 14, 2015 at 01:03:20PM +0300, Mika Kahola wrote:
> > From EDID we can read and request higher pixel clock than
> > our HW can support. This set of patches add checks if
> > requested pixel clock is lower than the one supported by the HW.
> > The requested mode is discarded if we cannot support the requested
> > pixel clock. For example for Cherryview
> > 
> > 'cvt 2560 1600 60' gives
> > 
> > # 2560x1600 59.99 Hz (CVT 4.10MA) hsync: 99.46 kHz; pclk: 348.50 MHz
> > Modeline "2560x1600_60.00"  348.50  2560 2760 3032 3504  1600 1603 1609 1658 -hsync +vsync
> > 
> > where pixel clock 348.50 MHz is higher than the supported 304 MHz.
> > 
> > The checks are implemented for DisplayPort, HDMI, LVDS, DVO, SDVO, DSI,
> > CRT, TV, and DP-MST.
> > 
> > V2:
> > - The maximum DOT clock frequency is added to debugfs i915_frequency_info.
> > - max dotclock cached in dev_priv structure
> > - moved computation of max dotclock to 'intel_display.c'
> > 
> > V3:
> > - intel_update_max_dotclk() renamed as intel_compute_max_dotclk()
> > - for GEN9 and above the max dotclock frequency is equal to CD clock
> >   frequency
> > - for older generations the dot clock frequency is limited to 90% of the
> >   CD clock frequency
> > - For Cherryview the dot clock is limited to 95% of CD clock frequency
> > - for GEN2/3 the maximum dot clock frequency is limited to 90% of the
> >   2X CD clock frequency as we have on option to use double wide mode
> > - cleanup
> > 
> > V4:
> > - renaming of max_dotclk as max_dotclk_freq in dev_priv (i915_drv.h)
> >   caused changes to all patches in my series even though some of them has
> >   been r-b'd by Ville
> > - for consistency the max_pixclk variable is renamed as max_dotclk throughout
> >   the whole series
> 
> One thing that was completely missed here is testcases? Do they exist?
> -Daniel
Yes, the testcases are still missing.

-Mika-


> > 
> > Mika Kahola (11):
> >   drm/i915: Store max dotclock
> >   drm/i915: DisplayPort pixel clock check
> >   drm/i915: HDMI pixel clock check
> >   drm/i915: LVDS pixel clock check
> >   drm/i915: SDVO pixel clock check
> >   drm/i915: DSI pixel clock check
> >   drm/i915: CRT pixel clock check
> >   drm/i915: TV pixel clock check
> >   drm/i915: DisplayPort-MST pixel clock check
> >   drm/i915: DVO pixel clock check
> >   drm/i915: Max DOT clock frequency to debugfs
> > 
> >  drivers/gpu/drm/i915/i915_debugfs.c  |  2 ++
> >  drivers/gpu/drm/i915/i915_drv.h      |  1 +
> >  drivers/gpu/drm/i915/intel_crt.c     |  4 ++++
> >  drivers/gpu/drm/i915/intel_display.c | 19 +++++++++++++++++++
> >  drivers/gpu/drm/i915/intel_dp.c      |  3 ++-
> >  drivers/gpu/drm/i915/intel_dp_mst.c  |  5 +++++
> >  drivers/gpu/drm/i915/intel_dsi.c     |  3 +++
> >  drivers/gpu/drm/i915/intel_dvo.c     |  3 +++
> >  drivers/gpu/drm/i915/intel_hdmi.c    |  8 ++++++++
> >  drivers/gpu/drm/i915/intel_lvds.c    | 15 +++++++++++----
> >  drivers/gpu/drm/i915/intel_sdvo.c    |  4 ++++
> >  drivers/gpu/drm/i915/intel_tv.c      |  4 ++++
> >  12 files changed, 66 insertions(+), 5 deletions(-)
> > 
> > -- 
> > 1.9.1
> > 
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>