target/linux/bcm27xx/patches-6.1/950-0932-drm-vc4-hdmi-Warn-if-writing-to-an-unknown-HDMI-regi.patch

   1 From cdbebb3a92aca7327c88c6dc6ef5d4cd470d49fc Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Thu, 23 Feb 2023 19:44:32 +0100
   4 Subject: [PATCH] drm/vc4: hdmi: Warn if writing to an unknown HDMI register
   5
   6 The VC4 HDMI driver has a bunch of accessors to read from a register.
   7 The read accessor was warning when accessing an unknown register, but
   8 the write one was just returning silently.
   9
  10 Let's make sure we warn also when writing to an unknown register.
  11
  12 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_hdmi_regs.h | 5 ++++-
  15  1 file changed, 4 insertions(+), 1 deletion(-)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h
  18 +++ b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h
  19 @@ -498,8 +498,11 @@ static inline void vc4_hdmi_write(struct
  20
  21         field = &variant->registers[reg];
  22         base = __vc4_hdmi_get_field_base(hdmi, field->reg);
  23 -       if (!base)
  24 +       if (!base) {
  25 +               dev_warn(&hdmi->pdev->dev,
  26 +                        "Unknown register ID %u\n", reg);
  27                 return;
  28 +       }
  29
  30         writel(value, base + field->offset);
  31  }