target/linux/bcm27xx/patches-5.10/950-0460-drm-vc4-hdmi-Don-t-register-the-CEC-adapter-if-there.patch

   1 From 8fb908fe3f80d6bbc0a7f5e7fe14ababe7f87f83 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Mon, 11 Jan 2021 15:23:06 +0100
   4 Subject: [PATCH] drm/vc4: hdmi: Don't register the CEC adapter if
   5  there's no interrupts
   6
   7 We introduced the BCM2711 support to the vc4 HDMI controller with 5.10,
   8 but this was lacking any of the interrupts of the CEC controller so we
   9 have to deal with the backward compatibility.
  10
  11 Do so by simply ignoring the CEC setup if the DT doesn't have the
  12 interrupts property.
  13
  14 Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  15 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  16 ---
  17  drivers/gpu/drm/vc4/vc4_hdmi.c | 6 ++++++
  18  1 file changed, 6 insertions(+)
  19
  20 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  21 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  22 @@ -1785,9 +1785,15 @@ static int vc4_hdmi_cec_init(struct vc4_
  23  {
  24         struct cec_connector_info conn_info;
  25         struct platform_device *pdev = vc4_hdmi->pdev;
  26 +       struct device *dev = &pdev->dev;
  27         u32 value;
  28         int ret;
  29
  30 +       if (!of_find_property(dev->of_node, "interrupts", NULL)) {
  31 +               dev_warn(dev, "'interrupts' DT property is missing, no CEC\n");
  32 +               return 0;
  33 +       }
  34 +
  35         vc4_hdmi->cec_adap = cec_allocate_adapter(&vc4_hdmi_cec_adap_ops,
  36                                                   vc4_hdmi, "vc4",
  37                                                   CEC_CAP_DEFAULTS |