target/linux/bcm27xx/patches-5.4/950-0257-drm-vc4-Max-resolution-of-7680-is-conditional-on-bei.patch

   1 From 2767f778820bd7392688512ec2996943a586db6e Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Thu, 30 May 2019 15:55:15 +0100
   4 Subject: [PATCH] drm/vc4: Max resolution of 7680 is conditional on
   5  being Pi4
   6
   7 The max resolution had been increased from 2048 to 7680 for all
   8 platforms. This code is common with Pi0-3 which have a max render
   9 target for GL of 2048, therefore the increased resolution has to
  10 be conditional on the platform.
  11 Switch based on whether the bcm2835-v3d node is found, as that is
  12 not present on Pi4. (There is a potential configuration on Pi0-3
  13 with no v3d, but this is very unlikely).
  14
  15 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  16 ---
  17  drivers/gpu/drm/vc4/vc4_kms.c | 11 +++++++++--
  18  1 file changed, 9 insertions(+), 2 deletions(-)
  19
  20 --- a/drivers/gpu/drm/vc4/vc4_kms.c
  21 +++ b/drivers/gpu/drm/vc4/vc4_kms.c
  22 @@ -18,6 +18,7 @@
  23  #include <drm/drm_plane_helper.h>
  24  #include <drm/drm_probe_helper.h>
  25  #include <drm/drm_vblank.h>
  26 +#include <drm/drm_drv.h>
  27
  28  #include "vc4_drv.h"
  29  #include "vc4_regs.h"
  30 @@ -536,8 +537,14 @@ int vc4_kms_load(struct drm_device *dev)
  31                 return ret;
  32         }
  33
  34 -       dev->mode_config.max_width = 7680;
  35 -       dev->mode_config.max_height = 7680;
  36 +       if (!drm_core_check_feature(dev, DRIVER_RENDER)) {
  37 +               /* No V3D as part of vc4. Assume this is Pi4. */
  38 +               dev->mode_config.max_width = 7680;
  39 +               dev->mode_config.max_height = 7680;
  40 +       } else {
  41 +               dev->mode_config.max_width = 2048;
  42 +               dev->mode_config.max_height = 2048;
  43 +       }
  44         dev->mode_config.funcs = &vc4_mode_funcs;
  45         dev->mode_config.preferred_depth = 24;
  46         dev->mode_config.async_page_flip = true;