diff mbox series

[05/10] media: vivid: vidioc_g_edid: do not change the original input EDID

Message ID 20240624095300.745567-6-anonolitunya@gmail.com
State New
Headers show
Series Add loopback support across multiple vivid instances | expand

Commit Message

Dorcas Anono Litunya June 24, 2024, 9:52 a.m. UTC 
From: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Returning an EDID for a connected output would modify the original
input EDID with the physical address of the output. That causes
problems, and it should just update the physical address of the
output EDID.

Update vivid_hdmi_edid to set the physical address to 0.0.0.0.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/media/test-drivers/vivid/vivid-core.c |  4 ++--
 .../test-drivers/vivid/vivid-vid-common.c     | 22 +++++++++++++++++--
 2 files changed, 22 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/test-drivers/vivid/vivid-core.c b/drivers/media/test-drivers/vivid/vivid-core.c
index 0273bc9863b0..4a9d9b30aa42 100644
--- a/drivers/media/test-drivers/vivid/vivid-core.c
+++ b/drivers/media/test-drivers/vivid/vivid-core.c
@@ -218,7 +218,7 @@  static const u8 vivid_hdmi_edid[256] = {
 	0x5e, 0x5d, 0x10, 0x1f, 0x04, 0x13, 0x22, 0x21,
 	0x20, 0x05, 0x14, 0x02, 0x11, 0x01, 0x23, 0x09,
 	0x07, 0x07, 0x83, 0x01, 0x00, 0x00, 0x6d, 0x03,
-	0x0c, 0x00, 0x10, 0x00, 0x00, 0x3c, 0x21, 0x00,
+	0x0c, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x21, 0x00,
 	0x60, 0x01, 0x02, 0x03, 0x67, 0xd8, 0x5d, 0xc4,
 	0x01, 0x78, 0x00, 0x00, 0xe2, 0x00, 0xca, 0xe3,
 	0x05, 0x00, 0x00, 0xe3, 0x06, 0x01, 0x00, 0x4d,
@@ -229,7 +229,7 @@  static const u8 vivid_hdmi_edid[256] = {
 	0x00, 0x00, 0x1a, 0x1a, 0x1d, 0x00, 0x80, 0x51,
 	0xd0, 0x1c, 0x20, 0x40, 0x80, 0x35, 0x00, 0xc0,
 	0x1c, 0x32, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x82,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x92,
 };
 
 static int vidioc_querycap(struct file *file, void  *priv,
diff --git a/drivers/media/test-drivers/vivid/vivid-vid-common.c b/drivers/media/test-drivers/vivid/vivid-vid-common.c
index 38d788b5cf19..a3e8eb90f11b 100644
--- a/drivers/media/test-drivers/vivid/vivid-vid-common.c
+++ b/drivers/media/test-drivers/vivid/vivid-vid-common.c
@@ -1038,6 +1038,7 @@  int vidioc_g_edid(struct file *file, void *_fh,
 	struct vivid_dev *dev = video_drvdata(file);
 	struct video_device *vdev = video_devdata(file);
 	struct cec_adapter *adap;
+	unsigned int loc;
 
 	memset(edid->reserved, 0, sizeof(edid->reserved));
 	if (vdev->vfl_dir == VFL_DIR_RX) {
@@ -1068,8 +1069,25 @@  int vidioc_g_edid(struct file *file, void *_fh,
 		return -EINVAL;
 	if (edid->blocks > dev->edid_blocks - edid->start_block)
 		edid->blocks = dev->edid_blocks - edid->start_block;
-	if (adap)
-		v4l2_set_edid_phys_addr(dev->edid, dev->edid_blocks * 128, adap->phys_addr);
+
 	memcpy(edid->edid, dev->edid + edid->start_block * 128, edid->blocks * 128);
+
+	loc = cec_get_edid_spa_location(dev->edid, dev->edid_blocks * 128);
+	if (vdev->vfl_dir == VFL_DIR_TX && adap && loc &&
+	    loc >= edid->start_block * 128 &&
+	    loc < (edid->start_block + edid->blocks) * 128) {
+		unsigned int i;
+		u8 sum = 0;
+
+		loc -= edid->start_block * 128;
+		edid->edid[loc] = adap->phys_addr >> 8;
+		edid->edid[loc + 1] = adap->phys_addr & 0xff;
+		loc &= ~0x7f;
+
+		/* update the checksum */
+		for (i = loc; i < loc + 127; i++)
+			sum += edid->edid[i];
+		edid->edid[i] = 256 - sum;
+	}
 	return 0;
 }