target/linux/bcm27xx/patches-5.4/950-0236-drm-vc4-Query-the-display-ID-for-each-display-in-FKM.patch

   1 From 5357e5991f09f78e945b3adcc5db0ebfa1766dc1 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Tue, 9 Apr 2019 12:37:28 +0100
   4 Subject: [PATCH] drm: vc4: Query the display ID for each display in
   5  FKMS
   6
   7 Replace the hard coded list of display IDs for a mailbox call
   8 that returns the display ID for each display that has been
   9 detected.
  10
  11 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  12 ---
  13  drivers/gpu/drm/vc4/vc4_firmware_kms.c     | 16 +++++++++++++---
  14  include/soc/bcm2835/raspberrypi-firmware.h |  1 +
  15  2 files changed, 14 insertions(+), 3 deletions(-)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  19 @@ -944,7 +944,7 @@ static int vc4_fkms_bind(struct device *
  20         struct vc4_crtc **crtc_list;
  21         u32 num_displays, display_num;
  22         int ret;
  23 -       const u32 display_num_lookup[] = {2, 7, 1};
  24 +       u32 display_id;
  25
  26         vc4->firmware_kms = true;
  27
  28 @@ -983,8 +983,18 @@ static int vc4_fkms_bind(struct device *
  29                 return -ENOMEM;
  30
  31         for (display_num = 0; display_num < num_displays; display_num++) {
  32 -               ret = vc4_fkms_create_screen(dev, drm, display_num,
  33 -                                            display_num_lookup[display_num],
  34 +               display_id = display_num;
  35 +               ret = rpi_firmware_property(vc4->firmware,
  36 +                                           RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_ID,
  37 +                                           &display_id, sizeof(display_id));
  38 +               /* FIXME: Determine the correct error handling here.
  39 +                * Should we fail to create the one "screen" but keep the
  40 +                * others, or fail the whole thing?
  41 +                */
  42 +               if (ret)
  43 +                       DRM_ERROR("Failed to get display id %u\n", display_num);
  44 +
  45 +               ret = vc4_fkms_create_screen(dev, drm, display_num, display_id,
  46                                              &crtc_list[display_num]);
  47                 if (ret)
  48                         DRM_ERROR("Oh dear, failed to create display %u\n",
  49 --- a/include/soc/bcm2835/raspberrypi-firmware.h
  50 +++ b/include/soc/bcm2835/raspberrypi-firmware.h
  51 @@ -114,6 +114,7 @@ enum rpi_firmware_property_tag {
  52         RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF =               0x0004000f,
  53         RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF =            0x00040010,
  54         RPI_FIRMWARE_FRAMEBUFFER_RELEASE =                    0x00048001,
  55 +       RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_ID =             0x00040016,
  56         RPI_FIRMWARE_FRAMEBUFFER_SET_DISPLAY_NUM =            0x00048013,
  57         RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS =           0x00040013,
  58         RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_SETTINGS =       0x00040014,