>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 V5: - remaining tweaks for dotclock max frequency computation (HSW and BDW) and LVDS, DSI, and DVO fixes based on Ville's comments Thanks Ville for reviewing the rest of the series! Mika Kahola (4): drm/i915: Store max dotclock drm/i915: LVDS pixel clock check drm/i915: DSI pixel clock check drm/i915: DVO pixel clock check drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/intel_display.c | 20 ++++++++++++++++++++ drivers/gpu/drm/i915/intel_dsi.c | 3 +++ drivers/gpu/drm/i915/intel_dvo.c | 7 +++++++ drivers/gpu/drm/i915/intel_lvds.c | 3 +++ 5 files changed, 34 insertions(+) -- 1.9.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
