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    • Aaron Plattner's avatar
      modesetting: Defer crtc gamma size upgrade to drmmode_setup_colormap · b75d0cca
      Aaron Plattner authored
      Rather than trying to create a gamma ramp array of the appropriate size in
      drmmode_crtc_init when the GAMMA_LUT property should be used, just flag the crtc
      as wanting to use the GAMMA_LUT property and then replace the gamma ramp later,
      right before calling xf86HandleColormaps. This avoids a problem during initial
      startup where xf86RandR12CreateObjects12 hard-codes a gamma ramp size of 256,
      causing xf86RandR12CrtcSetGamma to read past the end of the DIX layer's RandR
      gamma ramp array:
      
        PreInit
          drmmode_pre_init
            drmmode_crtc_init
              crtc->gamma_size = 1024
      
        ScreenInit
          xf86CrtcScreenInit
            xf86RandR12Init
              xf86RandR12Init12
                xf86RandR12CreateObjects12
                  RRCrtcCreate
                    randr_crtc->gammaSize = 0
                xf86RandR12InitGamma(pScrn, 256)
                  RRCrtcGammaSetSize
                    randr_crtc->gammaSize = 256
                xf86RandR12InitGamma
                  xf86RandR12CrtcInitGamma
                    RRCrtcGammaSet
                      xf86RandR12CrtcSetGamma
                        // crtc->gamma_size is 1024 here, while randr_crtc->gammaRed
                        // is a 256-element array.
                        memcpy(crtc->gamma_red, randr_crtc->gammaRed, crtc->gamma_size * sizeof(crtc->gamma_red[0]));
          drmmode_setup_colormap
            xf86HandleColormaps
              xf86RandR12InitGamma
                RRCrtcGammaSetSize
                  randr_crtc->gammaSize = 1024
      
      Fixes: 245b9db0 - modesetting: Use GAMMA_LUT when available
      Closes: xorg/xserver#1126
      
      
      Signed-off-by: Aaron Plattner's avatarAaron Plattner <aplattner@nvidia.com>
      Reviewed-by: Robert Morell's avatarRobert Morell <rmorell@nvidia.com>
      b75d0cca
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