target/linux/bcm27xx/patches-5.4/950-0712-vc4_hdmi-Fix-register-offset-when-sending-longer-CEC.patch

   1 From 602ec343e69479dbec368f67d09c9f3e3e5ac248 Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Thu, 7 May 2020 18:16:07 +0100
   4 Subject: [PATCH] vc4_hdmi: Fix register offset when sending longer CEC
   5  messages
   6
   7 Signed-off-by: Dom Cobley <popcornmix@gmail.com>
   8 ---
   9  drivers/gpu/drm/vc4/vc4_hdmi.c | 13 +++++++++++--
  10  1 file changed, 11 insertions(+), 2 deletions(-)
  11
  12 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  13 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  14 @@ -1264,8 +1264,13 @@ static void vc4_cec_read_msg(struct vc4_
  15
  16         msg->len = 1 + ((cntrl1 & VC4_HDMI_CEC_REC_WRD_CNT_MASK) >>
  17                                         VC4_HDMI_CEC_REC_WRD_CNT_SHIFT);
  18 +
  19 +       if (msg->len > 16) {
  20 +               DRM_ERROR("Attempting to read too much data (%d)\n", msg->len);
  21 +               return;
  22 +       }
  23         for (i = 0; i < msg->len; i += 4) {
  24 -               u32 val = HDMI_READ(HDMI_CEC_RX_DATA_1 + i);
  25 +               u32 val = HDMI_READ(HDMI_CEC_RX_DATA_1 + (i>>2));
  26
  27                 msg->msg[i] = val & 0xff;
  28                 msg->msg[i + 1] = (val >> 8) & 0xff;
  29 @@ -1361,8 +1366,12 @@ static int vc4_hdmi_cec_adap_transmit(st
  30         u32 val;
  31         unsigned int i;
  32
  33 +       if (msg->len > 16) {
  34 +               DRM_ERROR("Attempting to transmit too much data (%d)\n", msg->len);
  35 +               return -ENOMEM;
  36 +       }
  37         for (i = 0; i < msg->len; i += 4)
  38 -               HDMI_WRITE(HDMI_CEC_TX_DATA_1 + i,
  39 +               HDMI_WRITE(HDMI_CEC_TX_DATA_1 + (i>>2),
  40                            (msg->msg[i]) |
  41                            (msg->msg[i + 1] << 8) |
  42                            (msg->msg[i + 2] << 16) |