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drm/edid: Fix secondary block fetch.
This makes fetching the second EDID block on HDMI monitors actually work. DDC can't transfer more than 128 bytes at a time. Also, rearrange the code so the pure DDC bits are separate from block parse. Signed-off-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Adam Jackson
Dave Airlie
parent
95beb69017
commit
61e57a8d72
@ -2,6 +2,7 @@
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* Copyright (c) 2006 Luc Verhaegen (quirks list)
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* Copyright (c) 2007-2008 Intel Corporation
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* Jesse Barnes <jesse.barnes@intel.com>
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* Copyright 2010 Red Hat, Inc.
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*
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* DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
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* FB layer.
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@ -106,36 +107,38 @@ static struct edid_quirk {
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{ "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
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};
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/*** DDC fetch and block validation ***/
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/* Valid EDID header has these bytes */
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static const u8 edid_header[] = {
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
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};
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/**
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* drm_edid_is_valid - sanity check EDID data
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* @edid: EDID data
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*
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* Sanity check the EDID block by looking at the header, the version number
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* and the checksum. Return 0 if the EDID doesn't check out, or 1 if it's
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* valid.
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/*
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* Sanity check the EDID block (base or extension). Return 0 if the block
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* doesn't check out, or 1 if it's valid.
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*/
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bool drm_edid_is_valid(struct edid *edid)
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static bool
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drm_edid_block_valid(u8 *raw_edid)
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{
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int i, score = 0;
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int i;
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u8 csum = 0;
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u8 *raw_edid = (u8 *)edid;
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struct edid *edid = (struct edid *)raw_edid;
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for (i = 0; i < sizeof(edid_header); i++)
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if (raw_edid[i] == edid_header[i])
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score++;
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if (raw_edid[0] == 0x00) {
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int score = 0;
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if (score == 8) ;
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else if (score >= 6) {
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DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
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memcpy(raw_edid, edid_header, sizeof(edid_header));
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} else
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goto bad;
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for (i = 0; i < sizeof(edid_header); i++)
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if (raw_edid[i] == edid_header[i])
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score++;
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if (score == 8) ;
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else if (score >= 6) {
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DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
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memcpy(raw_edid, edid_header, sizeof(edid_header));
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} else {
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goto bad;
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}
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}
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for (i = 0; i < EDID_LENGTH; i++)
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csum += raw_edid[i];
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@ -144,13 +147,21 @@ bool drm_edid_is_valid(struct edid *edid)
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goto bad;
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}
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if (edid->version != 1) {
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DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
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goto bad;
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}
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/* per-block-type checks */
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switch (raw_edid[0]) {
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case 0: /* base */
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if (edid->version != 1) {
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DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
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goto bad;
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}
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if (edid->revision > 4)
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DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
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if (edid->revision > 4)
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DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
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break;
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default:
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break;
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}
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return 1;
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@ -162,8 +173,158 @@ bad:
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}
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return 0;
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}
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/**
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* drm_edid_is_valid - sanity check EDID data
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* @edid: EDID data
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*
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* Sanity-check an entire EDID record (including extensions)
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*/
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bool drm_edid_is_valid(struct edid *edid)
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{
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int i;
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u8 *raw = (u8 *)edid;
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if (!edid)
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return false;
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for (i = 0; i <= edid->extensions; i++)
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if (!drm_edid_block_valid(raw + i * EDID_LENGTH))
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return false;
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return true;
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}
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EXPORT_SYMBOL(drm_edid_is_valid);
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#define DDC_ADDR 0x50
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#define DDC_SEGMENT_ADDR 0x30
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/**
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* Get EDID information via I2C.
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*
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* \param adapter : i2c device adaptor
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* \param buf : EDID data buffer to be filled
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* \param len : EDID data buffer length
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* \return 0 on success or -1 on failure.
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*
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* Try to fetch EDID information by calling i2c driver function.
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*/
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static int
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drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
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int block, int len)
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{
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unsigned char start = block * EDID_LENGTH;
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struct i2c_msg msgs[] = {
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{
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.addr = DDC_ADDR,
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.flags = 0,
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.len = 1,
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.buf = &start,
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}, {
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.addr = DDC_ADDR,
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.flags = I2C_M_RD,
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.len = len,
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.buf = buf + start,
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}
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};
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if (i2c_transfer(adapter, msgs, 2) == 2)
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return 0;
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return -1;
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}
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static u8 *
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drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
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{
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int i, j = 0;
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u8 *block, *new;
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if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
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return NULL;
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/* base block fetch */
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for (i = 0; i < 4; i++) {
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if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
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goto out;
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if (drm_edid_block_valid(block))
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break;
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}
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if (i == 4)
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goto carp;
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/* if there's no extensions, we're done */
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if (block[0x7e] == 0)
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return block;
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new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
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if (!new)
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goto out;
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block = new;
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for (j = 1; j <= block[0x7e]; j++) {
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for (i = 0; i < 4; i++) {
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if (drm_do_probe_ddc_edid(adapter, block, j,
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EDID_LENGTH))
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goto out;
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if (drm_edid_block_valid(block + j * EDID_LENGTH))
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break;
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}
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if (i == 4)
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goto carp;
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}
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return block;
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carp:
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dev_warn(&connector->dev->pdev->dev, "%s: EDID block %d invalid.\n",
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drm_get_connector_name(connector), j);
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out:
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kfree(block);
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return NULL;
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}
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/**
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* Probe DDC presence.
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*
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* \param adapter : i2c device adaptor
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* \return 1 on success
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*/
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static bool
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drm_probe_ddc(struct i2c_adapter *adapter)
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{
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unsigned char out;
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return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
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}
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/**
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* drm_get_edid - get EDID data, if available
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* @connector: connector we're probing
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* @adapter: i2c adapter to use for DDC
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*
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* Poke the given i2c channel to grab EDID data if possible. If found,
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* attach it to the connector.
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*
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* Return edid data or NULL if we couldn't find any.
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*/
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struct edid *drm_get_edid(struct drm_connector *connector,
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struct i2c_adapter *adapter)
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{
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struct edid *edid = NULL;
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if (drm_probe_ddc(adapter))
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edid = (struct edid *)drm_do_get_edid(connector, adapter);
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connector->display_info.raw_edid = (char *)edid;
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return edid;
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}
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EXPORT_SYMBOL(drm_get_edid);
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/*** EDID parsing ***/
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/**
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* edid_vendor - match a string against EDID's obfuscated vendor field
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* @edid: EDID to match
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@ -1141,123 +1302,6 @@ static int add_detailed_info_eedid(struct drm_connector *connector,
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return modes;
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}
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#define DDC_ADDR 0x50
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/**
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* Get EDID information via I2C.
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*
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* \param adapter : i2c device adaptor
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* \param buf : EDID data buffer to be filled
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* \param len : EDID data buffer length
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* \return 0 on success or -1 on failure.
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*
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* Try to fetch EDID information by calling i2c driver function.
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*/
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int drm_do_probe_ddc_edid(struct i2c_adapter *adapter,
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unsigned char *buf, int len)
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{
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unsigned char start = 0x0;
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struct i2c_msg msgs[] = {
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{
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.addr = DDC_ADDR,
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.flags = 0,
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.len = 1,
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.buf = &start,
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}, {
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.addr = DDC_ADDR,
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.flags = I2C_M_RD,
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.len = len,
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.buf = buf,
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}
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};
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if (i2c_transfer(adapter, msgs, 2) == 2)
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return 0;
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return -1;
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}
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EXPORT_SYMBOL(drm_do_probe_ddc_edid);
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static int drm_ddc_read_edid(struct drm_connector *connector,
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struct i2c_adapter *adapter,
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char *buf, int len)
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{
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int i;
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for (i = 0; i < 4; i++) {
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if (drm_do_probe_ddc_edid(adapter, buf, len))
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return -1;
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if (drm_edid_is_valid((struct edid *)buf))
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return 0;
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}
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/* repeated checksum failures; warn, but carry on */
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dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
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drm_get_connector_name(connector));
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return -1;
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}
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/**
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* drm_get_edid - get EDID data, if available
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* @connector: connector we're probing
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* @adapter: i2c adapter to use for DDC
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*
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* Poke the given connector's i2c channel to grab EDID data if possible.
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*
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* Return edid data or NULL if we couldn't find any.
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*/
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struct edid *drm_get_edid(struct drm_connector *connector,
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struct i2c_adapter *adapter)
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{
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int ret;
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struct edid *edid;
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edid = kmalloc(EDID_LENGTH * (DRM_MAX_EDID_EXT_NUM + 1),
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GFP_KERNEL);
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if (edid == NULL) {
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dev_warn(&connector->dev->pdev->dev,
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"Failed to allocate EDID\n");
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goto end;
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}
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/* Read first EDID block */
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ret = drm_ddc_read_edid(connector, adapter,
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(unsigned char *)edid, EDID_LENGTH);
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if (ret != 0)
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goto clean_up;
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/* There are EDID extensions to be read */
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if (edid->extensions != 0) {
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int edid_ext_num = edid->extensions;
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if (edid_ext_num > DRM_MAX_EDID_EXT_NUM) {
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dev_warn(&connector->dev->pdev->dev,
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"The number of extension(%d) is "
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"over max (%d), actually read number (%d)\n",
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edid_ext_num, DRM_MAX_EDID_EXT_NUM,
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DRM_MAX_EDID_EXT_NUM);
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/* Reset EDID extension number to be read */
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edid_ext_num = DRM_MAX_EDID_EXT_NUM;
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}
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/* Read EDID including extensions too */
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ret = drm_ddc_read_edid(connector, adapter, (char *)edid,
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EDID_LENGTH * (edid_ext_num + 1));
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if (ret != 0)
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goto clean_up;
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}
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connector->display_info.raw_edid = (char *)edid;
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goto end;
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clean_up:
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kfree(edid);
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edid = NULL;
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end:
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return edid;
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}
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EXPORT_SYMBOL(drm_get_edid);
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#define HDMI_IDENTIFIER 0x000C03
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#define VENDOR_BLOCK 0x03
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/**
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@ -666,8 +666,6 @@ extern void drm_fb_release(struct drm_file *file_priv);
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extern int drm_mode_group_init_legacy_group(struct drm_device *dev, struct drm_mode_group *group);
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extern struct edid *drm_get_edid(struct drm_connector *connector,
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struct i2c_adapter *adapter);
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extern int drm_do_probe_ddc_edid(struct i2c_adapter *adapter,
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unsigned char *buf, int len);
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extern int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid);
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extern void drm_mode_probed_add(struct drm_connector *connector, struct drm_display_mode *mode);
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extern void drm_mode_remove(struct drm_connector *connector, struct drm_display_mode *mode);
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