git.openwrt.org Git - openwrt/openwrt.git/blob

   1 From ff882e312a746a4a794a089e912e5e56baa8b5b4 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Fri, 3 Jul 2020 14:11:55 +0100
   4 Subject: [PATCH] drm/vc4: Make FKMS max refresh rate a module
   5  parameter
   6
   7 Some people want to use the high refresh rate modes for 1080p100
   8 and 1080p120, but they're currently filtered out as generally
   9 they don't add anything.
  10
  11 Make the filter threshold a module parameter so that it can be
  12 adjusted.
  13
  14 https://github.com/raspberrypi/linux/issues/3677
  15
  16 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  17 ---
  18  drivers/gpu/drm/vc4/vc4_firmware_kms.c | 12 ++++++++++--
  19  1 file changed, 10 insertions(+), 2 deletions(-)
  20
  21 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  22 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  23 @@ -14,6 +14,8 @@
  24   * Pi's firmware display stack.
  25   */
  26
  27 +#include <linux/module.h>
  28 +
  29  #include "drm/drm_atomic_helper.h"
  30  #include "drm/drm_gem_framebuffer_helper.h"
  31  #include "drm/drm_plane_helper.h"
  32 @@ -32,6 +34,10 @@
  33  #include "vc_image_types.h"
  34  #include <soc/bcm2835/raspberrypi-firmware.h>
  35
  36 +int fkms_max_refresh_rate = 85;
  37 +module_param(fkms_max_refresh_rate, int, 0644);
  38 +MODULE_PARM_DESC(fkms_max_refresh_rate, "Max supported refresh rate");
  39 +
  40  struct get_display_cfg {
  41         u32  max_pixel_clock[2];  //Max pixel clock for each display
  42  };
  43 @@ -1069,8 +1075,10 @@ vc4_crtc_mode_valid(struct drm_crtc *crt
  44                 return MODE_NO_DBLESCAN;
  45         }
  46
  47 -       /* Disable refresh rates > 85Hz as limited gain from them */
  48 -       if (drm_mode_vrefresh(mode) > 85)
  49 +       /* Disable refresh rates > defined threshold (default 85Hz) as limited
  50 +        * gain from them
  51 +        */
  52 +       if (drm_mode_vrefresh(mode) > fkms_max_refresh_rate)
  53                 return MODE_BAD_VVALUE;
  54
  55         /* Limit the pixel clock based on the HDMI clock limits from the