target/linux/bcm27xx/patches-5.15/950-0793-drm-modes-Add-of_get_drm_panel_display_mode.patch

   1 From ab0dac9b018f82dfb5696e9671734178d226872f Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
   3 Date: Sun, 27 Feb 2022 13:47:11 +0100
   4 Subject: [PATCH] drm/modes: Add of_get_drm_panel_display_mode()
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 commit 95ae342 upstream.
  10
  11 Add a function to get a drm_display_mode from a panel-timing
  12 device tree subnode.
  13
  14 Suggested-by: Sam Ravnborg <sam@ravnborg.org>
  15 Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
  16 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  17 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  18 Link: https://patchwork.freedesktop.org/patch/msgid/20220227124713.39766-4-noralf@tronnes.org
  19 ---
  20  drivers/gpu/drm/drm_modes.c | 49 +++++++++++++++++++++++++++++++++++++
  21  include/drm/drm_modes.h     |  8 ++++++
  22  2 files changed, 57 insertions(+)
  23
  24 --- a/drivers/gpu/drm/drm_modes.c
  25 +++ b/drivers/gpu/drm/drm_modes.c
  26 @@ -35,6 +35,7 @@
  27  #include <linux/list_sort.h>
  28  #include <linux/export.h>
  29
  30 +#include <video/of_display_timing.h>
  31  #include <video/of_videomode.h>
  32  #include <video/videomode.h>
  33
  34 @@ -727,6 +728,54 @@ int of_get_drm_display_mode(struct devic
  35         return 0;
  36  }
  37  EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
  38 +
  39 +/**
  40 + * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
  41 + * @np: device_node with the panel-timing specification
  42 + * @dmode: will be set to the return value
  43 + * @bus_flags: information about pixelclk, sync and DE polarity
  44 + *
  45 + * The Device Tree properties width-mm and height-mm will be read and set on
  46 + * the display mode if they are present.
  47 + *
  48 + * Returns:
  49 + * Zero on success, negative error code on failure.
  50 + */
  51 +int of_get_drm_panel_display_mode(struct device_node *np,
  52 +                                 struct drm_display_mode *dmode, u32 *bus_flags)
  53 +{
  54 +       u32 width_mm = 0, height_mm = 0;
  55 +       struct display_timing timing;
  56 +       struct videomode vm;
  57 +       int ret;
  58 +
  59 +       ret = of_get_display_timing(np, "panel-timing", &timing);
  60 +       if (ret)
  61 +               return ret;
  62 +
  63 +       videomode_from_timing(&timing, &vm);
  64 +
  65 +       memset(dmode, 0, sizeof(*dmode));
  66 +       drm_display_mode_from_videomode(&vm, dmode);
  67 +       if (bus_flags)
  68 +               drm_bus_flags_from_videomode(&vm, bus_flags);
  69 +
  70 +       ret = of_property_read_u32(np, "width-mm", &width_mm);
  71 +       if (ret && ret != -EINVAL)
  72 +               return ret;
  73 +
  74 +       ret = of_property_read_u32(np, "height-mm", &height_mm);
  75 +       if (ret && ret != -EINVAL)
  76 +               return ret;
  77 +
  78 +       dmode->width_mm = width_mm;
  79 +       dmode->height_mm = height_mm;
  80 +
  81 +       drm_mode_debug_printmodeline(dmode);
  82 +
  83 +       return 0;
  84 +}
  85 +EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
  86  #endif /* CONFIG_OF */
  87  #endif /* CONFIG_VIDEOMODE_HELPERS */
  88
  89 --- a/include/drm/drm_modes.h
  90 +++ b/include/drm/drm_modes.h
  91 @@ -466,6 +466,8 @@ void drm_bus_flags_from_videomode(const
  92  int of_get_drm_display_mode(struct device_node *np,
  93                             struct drm_display_mode *dmode, u32 *bus_flags,
  94                             int index);
  95 +int of_get_drm_panel_display_mode(struct device_node *np,
  96 +                                 struct drm_display_mode *dmode, u32 *bus_flags);
  97  #else
  98  static inline int of_get_drm_display_mode(struct device_node *np,
  99                                           struct drm_display_mode *dmode,
 100 @@ -473,6 +475,12 @@ static inline int of_get_drm_display_mod
 101  {
 102         return -EINVAL;
 103  }
 104 +
 105 +static inline int of_get_drm_panel_display_mode(struct device_node *np,
 106 +                                               struct drm_display_mode *dmode, u32 *bus_flags)
 107 +{
 108 +       return -EINVAL;
 109 +}
 110  #endif
 111
 112  void drm_mode_set_name(struct drm_display_mode *mode);