Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 9093c042 authored by Ajay Singh Parmar's avatar Ajay Singh Parmar
Browse files

msm: mdss: hdmi: add support for custom edid 



Add sysfs node to provide a custome EDID to HDMI driver to
address some special requirements from user applications like
switching to a custom EDID in cases where sink doesn't support
EDID or DDC line to read EDID.

Change-Id: I75726e28722aa128cfc315b3b1b0e97e9a9cde56
Signed-off-by: default avatarAjay Singh Parmar <aparmar@codeaurora.org>
parent 7427cd00

drivers/video/msm/mdss/mdss_hdmi_tx.c

+83 −5
Original line number Diff line number Diff line
@@ -674,6 +674,77 @@ static ssize_t hdmi_tx_sysfs_rda_connected(struct device *dev, 
	return ret;

} /* hdmi_tx_sysfs_rda_connected */



static ssize_t hdmi_tx_sysfs_wta_edid(struct device *dev,

	struct device_attribute *attr, const char *buf, size_t count)

{

	ssize_t ret = strnlen(buf, PAGE_SIZE);

	struct hdmi_tx_ctrl *hdmi_ctrl = NULL;

	int i = 0;

	const char *buf_t = buf;

	const int char_to_nib = 2;

	int edid_size = count / char_to_nib;



	hdmi_ctrl = hdmi_tx_get_drvdata_from_sysfs_dev(dev);



	if (!hdmi_ctrl || !hdmi_ctrl->edid_buf) {

		DEV_ERR("%s: invalid data\n", __func__);

		return -EINVAL;

	}



	memset(hdmi_ctrl->edid_buf, 0, hdmi_ctrl->edid_buf_size);



	while (edid_size--) {

		char t[char_to_nib + 1];

		int d, rc;



		memcpy(t, buf_t, sizeof(char) * char_to_nib);

		t[char_to_nib] = '\0';



		rc = kstrtoint(t, 16, &d);

		if (rc) {

			pr_err("kstrtoint error %d\n", rc);

			return rc;

		}



		memcpy(hdmi_ctrl->edid_buf + i++, &d,

			sizeof(*hdmi_ctrl->edid_buf));



		buf_t += char_to_nib;

	}



	hdmi_ctrl->custom_edid = true;



	return ret;

}



static ssize_t hdmi_tx_sysfs_rda_edid(struct device *dev,

	struct device_attribute *attr, char *buf)

{

	struct hdmi_tx_ctrl *hdmi_ctrl = NULL;

	u32 size;

	u32 cea_blks;



	hdmi_ctrl = hdmi_tx_get_drvdata_from_sysfs_dev(dev);



	if (!hdmi_ctrl || !hdmi_ctrl->edid_buf) {

		DEV_ERR("%s: invalid data\n", __func__);

		return -EINVAL;

	}



	cea_blks = hdmi_ctrl->edid_buf[EDID_BLOCK_SIZE - 2];

	size = (cea_blks + 1) * EDID_BLOCK_SIZE;

	size = min_t(u32, size, PAGE_SIZE);



	DEV_DBG("%s: edid size %d\n", __func__, size);



	memcpy(buf, hdmi_ctrl->edid_buf, size);



	print_hex_dump(KERN_DEBUG, "HDMI EDID: ", DUMP_PREFIX_NONE,

		16, 1, buf, size, false);



	return size;

}



static ssize_t hdmi_tx_sysfs_wta_audio_cb(struct device *dev,

	struct device_attribute *attr, const char *buf, size_t count)

{
@@ -1123,6 +1194,8 @@ static ssize_t hdmi_tx_sysfs_rda_s3d_mode(struct device *dev, 


static DEVICE_ATTR(connected, S_IRUGO, hdmi_tx_sysfs_rda_connected, NULL);

static DEVICE_ATTR(hdmi_audio_cb, S_IWUSR, NULL, hdmi_tx_sysfs_wta_audio_cb);

static DEVICE_ATTR(edid, S_IRUGO | S_IWUSR, hdmi_tx_sysfs_rda_edid,

	hdmi_tx_sysfs_wta_edid);

static DEVICE_ATTR(video_mode, S_IRUGO, hdmi_tx_sysfs_rda_video_mode, NULL);

static DEVICE_ATTR(hpd, S_IRUGO | S_IWUSR, hdmi_tx_sysfs_rda_hpd,

	hdmi_tx_sysfs_wta_hpd);
@@ -1139,6 +1212,7 @@ static DEVICE_ATTR(s3d_mode, S_IRUGO | S_IWUSR, hdmi_tx_sysfs_rda_s3d_mode, 
static struct attribute *hdmi_tx_fs_attrs[] = {

	&dev_attr_connected.attr,

	&dev_attr_hdmi_audio_cb.attr,

	&dev_attr_edid.attr,

	&dev_attr_video_mode.attr,

	&dev_attr_hpd.attr,

	&dev_attr_vendor_name.attr,
@@ -1678,6 +1752,7 @@ static int hdmi_tx_read_sink_info(struct hdmi_tx_ctrl *hdmi_ctrl) 
		goto error;

	}



	if (!hdmi_ctrl->custom_edid) {

		hdmi_ddc_config(&hdmi_ctrl->ddc_ctrl);



		status = hdmi_tx_read_edid(hdmi_ctrl);
@@ -1685,6 +1760,9 @@ static int hdmi_tx_read_sink_info(struct hdmi_tx_ctrl *hdmi_ctrl) 
			DEV_ERR("%s: error reading edid\n", __func__);

			goto error;

		}

	} else {

		hdmi_ctrl->custom_edid = false;

	}



	status = hdmi_edid_parser(hdmi_ctrl->feature_data[HDMI_TX_FEAT_EDID]);

	if (status)

drivers/video/msm/mdss/mdss_hdmi_tx.h

+1 −0
Original line number Diff line number Diff line
@@ -172,6 +172,7 @@ struct hdmi_tx_ctrl { 
	atomic_t audio_ack_pending;

	bool hdcp14_sw_keys;

	bool auth_state;

	bool custom_edid;

	u32 enc_lvl;



	u8 spd_vendor_name[9];