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From 602ec343e69479dbec368f67d09c9f3e3e5ac248 Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Thu, 7 May 2020 18:16:07 +0100
Subject: [PATCH] vc4_hdmi: Fix register offset when sending longer CEC
 messages

Signed-off-by: Dom Cobley <popcornmix@gmail.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1265,8 +1265,13 @@ static void vc4_cec_read_msg(struct vc4_
 
 	msg->len = 1 + ((cntrl1 & VC4_HDMI_CEC_REC_WRD_CNT_MASK) >>
 					VC4_HDMI_CEC_REC_WRD_CNT_SHIFT);
+
+	if (msg->len > 16) {
+		DRM_ERROR("Attempting to read too much data (%d)\n", msg->len);
+		return;
+	}
 	for (i = 0; i < msg->len; i += 4) {
-		u32 val = HDMI_READ(HDMI_CEC_RX_DATA_1 + i);
+		u32 val = HDMI_READ(HDMI_CEC_RX_DATA_1 + (i>>2));
 
 		msg->msg[i] = val & 0xff;
 		msg->msg[i + 1] = (val >> 8) & 0xff;
@@ -1362,8 +1367,12 @@ static int vc4_hdmi_cec_adap_transmit(st
 	u32 val;
 	unsigned int i;
 
+	if (msg->len > 16) {
+		DRM_ERROR("Attempting to transmit too much data (%d)\n", msg->len);
+		return -ENOMEM;
+	}
 	for (i = 0; i < msg->len; i += 4)
-		HDMI_WRITE(HDMI_CEC_TX_DATA_1 + i,
+		HDMI_WRITE(HDMI_CEC_TX_DATA_1 + (i>>2),
 			   (msg->msg[i]) |
 			   (msg->msg[i + 1] << 8) |
 			   (msg->msg[i + 2] << 16) |