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>

1 files changed, 187 insertions, 143 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 7e608f4a0df9..5e60a6129641 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2,6 +2,7 @@
  * Copyright (c) 2006 Luc Verhaegen (quirks list)
  * Copyright (c) 2007-2008 Intel Corporation
  *   Jesse Barnes <jesse.barnes@intel.com>
+ * Copyright 2010 Red Hat, Inc.
  *
  * DDC probing routines (drm_ddc_read & drm_do_probe_ddc_edid) originally from
  * FB layer.
@@ -106,36 +107,38 @@ static struct edid_quirk {
         { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
 };
 
+/*** DDC fetch and block validation ***/
 
-/* Valid EDID header has these bytes */
 static const u8 edid_header[] = {
         0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
 };
 
-/**
- * drm_edid_is_valid - sanity check EDID data
- * @edid: EDID data
- *
- * Sanity check the EDID block by looking at the header, the version number
- * and the checksum.  Return 0 if the EDID doesn't check out, or 1 if it's
- * valid.
+/*
+ * Sanity check the EDID block (base or extension).  Return 0 if the block
+ * doesn't check out, or 1 if it's valid.
  */
-bool drm_edid_is_valid(struct edid *edid)
+static bool
+drm_edid_block_valid(u8 *raw_edid)
 {
-        int i, score = 0;
+        int i;
         u8 csum = 0;
-        u8 *raw_edid = (u8 *)edid;
+        struct edid *edid = (struct edid *)raw_edid;
 
-        for (i = 0; i < sizeof(edid_header); i++)
-                if (raw_edid[i] == edid_header[i])
-                        score++;
+        if (raw_edid[0] == 0x00) {
+                int score = 0;
 
-        if (score == 8) ;
-        else if (score >= 6) {
-                DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
-                memcpy(raw_edid, edid_header, sizeof(edid_header));
-        } else
-                goto bad;
+                for (i = 0; i < sizeof(edid_header); i++)
+                        if (raw_edid[i] == edid_header[i])
+                                score++;
+
+                if (score == 8) ;
+                else if (score >= 6) {
+                        DRM_DEBUG("Fixing EDID header, your hardware may be failing\n");
+                        memcpy(raw_edid, edid_header, sizeof(edid_header));
+                } else {
+                        goto bad;
+                }
+        }
 
         for (i = 0; i < EDID_LENGTH; i++)
                 csum += raw_edid[i];
@@ -144,13 +147,21 @@ bool drm_edid_is_valid(struct edid *edid)
                 goto bad;
         }
 
-        if (edid->version != 1) {
-                DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
-                goto bad;
-        }
+        /* per-block-type checks */
+        switch (raw_edid[0]) {
+        case 0: /* base */
+                if (edid->version != 1) {
+                        DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version);
+                        goto bad;
+                }
 
-        if (edid->revision > 4)
-                DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
+                if (edid->revision > 4)
+                        DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n");
+                break;
+
+        default:
+                break;
+        }
 
         return 1;
 
@@ -162,8 +173,158 @@ bad:
         }
         return 0;
 }
+
+/**
+ * drm_edid_is_valid - sanity check EDID data
+ * @edid: EDID data
+ *
+ * Sanity-check an entire EDID record (including extensions)
+ */
+bool drm_edid_is_valid(struct edid *edid)
+{
+        int i;
+        u8 *raw = (u8 *)edid;
+
+        if (!edid)
+                return false;
+
+        for (i = 0; i <= edid->extensions; i++)
+                if (!drm_edid_block_valid(raw + i * EDID_LENGTH))
+                        return false;
+
+        return true;
+}
 EXPORT_SYMBOL(drm_edid_is_valid);
 
+#define DDC_ADDR 0x50
+#define DDC_SEGMENT_ADDR 0x30
+/**
+ * Get EDID information via I2C.
+ *
+ * \param adapter : i2c device adaptor
+ * \param buf     : EDID data buffer to be filled
+ * \param len     : EDID data buffer length
+ * \return 0 on success or -1 on failure.
+ *
+ * Try to fetch EDID information by calling i2c driver function.
+ */
+static int
+drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf,
+                      int block, int len)
+{
+        unsigned char start = block * EDID_LENGTH;
+        struct i2c_msg msgs[] = {
+                {
+                        .addr   = DDC_ADDR,
+                        .flags  = 0,
+                        .len    = 1,
+                        .buf    = &start,
+                }, {
+                        .addr   = DDC_ADDR,
+                        .flags  = I2C_M_RD,
+                        .len    = len,
+                        .buf    = buf + start,
+                }
+        };
+
+        if (i2c_transfer(adapter, msgs, 2) == 2)
+                return 0;
+
+        return -1;
+}
+
+static u8 *
+drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
+{
+        int i, j = 0;
+        u8 *block, *new;
+
+        if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
+                return NULL;
+
+        /* base block fetch */
+        for (i = 0; i < 4; i++) {
+                if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))
+                        goto out;
+                if (drm_edid_block_valid(block))
+                        break;
+        }
+        if (i == 4)
+                goto carp;
+
+        /* if there's no extensions, we're done */
+        if (block[0x7e] == 0)
+                return block;
+
+        new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
+        if (!new)
+                goto out;
+        block = new;
+
+        for (j = 1; j <= block[0x7e]; j++) {
+                for (i = 0; i < 4; i++) {
+                        if (drm_do_probe_ddc_edid(adapter, block, j,
+                                                  EDID_LENGTH))
+                                goto out;
+                        if (drm_edid_block_valid(block + j * EDID_LENGTH))
+                                break;
+                }
+                if (i == 4)
+                        goto carp;
+        }
+
+        return block;
+
+carp:
+        dev_warn(&connector->dev->pdev->dev, "%s: EDID block %d invalid.\n",
+                 drm_get_connector_name(connector), j);
+
+out:
+        kfree(block);
+        return NULL;
+}
+
+/**
+ * Probe DDC presence.
+ *
+ * \param adapter : i2c device adaptor
+ * \return 1 on success
+ */
+static bool
+drm_probe_ddc(struct i2c_adapter *adapter)
+{
+        unsigned char out;
+
+        return (drm_do_probe_ddc_edid(adapter, &out, 0, 1) == 0);
+}
+
+/**
+ * drm_get_edid - get EDID data, if available
+ * @connector: connector we're probing
+ * @adapter: i2c adapter to use for DDC
+ *
+ * Poke the given i2c channel to grab EDID data if possible.  If found,
+ * attach it to the connector.
+ *
+ * Return edid data or NULL if we couldn't find any.
+ */
+struct edid *drm_get_edid(struct drm_connector *connector,
+                          struct i2c_adapter *adapter)
+{
+        struct edid *edid = NULL;
+
+        if (drm_probe_ddc(adapter))
+                edid = (struct edid *)drm_do_get_edid(connector, adapter);
+
+        connector->display_info.raw_edid = (char *)edid;
+
+        return edid;
+
+}
+EXPORT_SYMBOL(drm_get_edid);
+
+/*** EDID parsing ***/
+
 /**
  * edid_vendor - match a string against EDID's obfuscated vendor field
  * @edid: EDID to match
@@ -1141,123 +1302,6 @@ static int add_detailed_info_eedid(struct drm_connector *connector,
         return modes;
 }
 
-#define DDC_ADDR 0x50
-/**
- * Get EDID information via I2C.
- *
- * \param adapter : i2c device adaptor
- * \param buf     : EDID data buffer to be filled
- * \param len     : EDID data buffer length
- * \return 0 on success or -1 on failure.
- *
- * Try to fetch EDID information by calling i2c driver function.
- */
-int drm_do_probe_ddc_edid(struct i2c_adapter *adapter,
-                          unsigned char *buf, int len)
-{
-        unsigned char start = 0x0;
-        struct i2c_msg msgs[] = {
-                {
-                        .addr   = DDC_ADDR,
-                        .flags  = 0,
-                        .len    = 1,
-                        .buf    = &start,
-                }, {
-                        .addr   = DDC_ADDR,
-                        .flags  = I2C_M_RD,
-                        .len    = len,
-                        .buf    = buf,
-                }
-        };
-
-        if (i2c_transfer(adapter, msgs, 2) == 2)
-                return 0;
-
-        return -1;
-}
-EXPORT_SYMBOL(drm_do_probe_ddc_edid);
-
-static int drm_ddc_read_edid(struct drm_connector *connector,
-                             struct i2c_adapter *adapter,
-                             char *buf, int len)
-{
-        int i;
-
-        for (i = 0; i < 4; i++) {
-                if (drm_do_probe_ddc_edid(adapter, buf, len))
-                        return -1;
-                if (drm_edid_is_valid((struct edid *)buf))
-                        return 0;
-        }
-
-        /* repeated checksum failures; warn, but carry on */
-        dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",
-                 drm_get_connector_name(connector));
-        return -1;
-}
-
-/**
- * drm_get_edid - get EDID data, if available
- * @connector: connector we're probing
- * @adapter: i2c adapter to use for DDC
- *
- * Poke the given connector's i2c channel to grab EDID data if possible.
- *
- * Return edid data or NULL if we couldn't find any.
- */
-struct edid *drm_get_edid(struct drm_connector *connector,
-                          struct i2c_adapter *adapter)
-{
-        int ret;
-        struct edid *edid;
-
-        edid = kmalloc(EDID_LENGTH * (DRM_MAX_EDID_EXT_NUM + 1),
-                       GFP_KERNEL);
-        if (edid == NULL) {
-                dev_warn(&connector->dev->pdev->dev,
-                         "Failed to allocate EDID\n");
-                goto end;
-        }
-
-        /* Read first EDID block */
-        ret = drm_ddc_read_edid(connector, adapter,
-                                (unsigned char *)edid, EDID_LENGTH);
-        if (ret != 0)
-                goto clean_up;
-
-        /* There are EDID extensions to be read */
-        if (edid->extensions != 0) {
-                int edid_ext_num = edid->extensions;
-
-                if (edid_ext_num > DRM_MAX_EDID_EXT_NUM) {
-                        dev_warn(&connector->dev->pdev->dev,
-                                 "The number of extension(%d) is "
-                                 "over max (%d), actually read number (%d)\n",
-                                 edid_ext_num, DRM_MAX_EDID_EXT_NUM,
-                                 DRM_MAX_EDID_EXT_NUM);
-                        /* Reset EDID extension number to be read */
-                        edid_ext_num = DRM_MAX_EDID_EXT_NUM;
-                }
-                /* Read EDID including extensions too */
-                ret = drm_ddc_read_edid(connector, adapter, (char *)edid,
-                                        EDID_LENGTH * (edid_ext_num + 1));
-                if (ret != 0)
-                        goto clean_up;
-
-        }
-
-        connector->display_info.raw_edid = (char *)edid;
-        goto end;
-
-clean_up:
-        kfree(edid);
-        edid = NULL;
-end:
-        return edid;
-
-}
-EXPORT_SYMBOL(drm_get_edid);
-
 #define HDMI_IDENTIFIER 0x000C03
 #define VENDOR_BLOCK    0x03
 /**