diff options
author | Len Brown <len.brown@intel.com> | 2009-04-05 02:14:15 -0400 |
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committer | Len Brown <len.brown@intel.com> | 2009-04-05 02:14:15 -0400 |
commit | 478c6a43fcbc6c11609f8cee7c7b57223907754f (patch) | |
tree | a7f7952099da60d33032aed6de9c0c56c9f8779e /drivers/gpu/drm/drm_edid.c | |
parent | 8a3f257c704e02aee9869decd069a806b45be3f1 (diff) | |
parent | 6bb597507f9839b13498781e481f5458aea33620 (diff) |
Merge branch 'linus' into release
Conflicts:
arch/x86/kernel/cpu/cpufreq/longhaul.c
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
-rw-r--r-- | drivers/gpu/drm/drm_edid.c | 191 |
1 files changed, 158 insertions, 33 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index a839a28d8ee..ca9c6165671 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -125,10 +125,8 @@ static bool edid_is_valid(struct edid *edid) DRM_ERROR("EDID has major version %d, instead of 1\n", edid->version); goto bad; } - if (edid->revision > 3) { - DRM_ERROR("EDID has minor version %d, which is not between 0-3\n", edid->revision); - goto bad; - } + if (edid->revision > 4) + DRM_DEBUG("EDID minor > 4, assuming backward compatibility\n"); for (i = 0; i < EDID_LENGTH; i++) csum += raw_edid[i]; @@ -162,7 +160,7 @@ static bool edid_vendor(struct edid *edid, char *vendor) edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@'; edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) | ((edid->mfg_id[1] & 0xe0) >> 5)) + '@'; - edid_vendor[2] = (edid->mfg_id[2] & 0x1f) + '@'; + edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@'; return !strncmp(edid_vendor, vendor, 3); } @@ -550,11 +548,20 @@ static int add_detailed_info(struct drm_connector *connector, } #define DDC_ADDR 0x50 - -unsigned char *drm_do_probe_ddc_edid(struct i2c_adapter *adapter) +/** + * 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; - unsigned char *buf = kmalloc(EDID_LENGTH, GFP_KERNEL); struct i2c_msg msgs[] = { { .addr = DDC_ADDR, @@ -564,31 +571,36 @@ unsigned char *drm_do_probe_ddc_edid(struct i2c_adapter *adapter) }, { .addr = DDC_ADDR, .flags = I2C_M_RD, - .len = EDID_LENGTH, + .len = len, .buf = buf, } }; - if (!buf) { - dev_warn(&adapter->dev, "unable to allocate memory for EDID " - "block.\n"); - return NULL; - } - if (i2c_transfer(adapter, msgs, 2) == 2) - return buf; + return 0; dev_info(&adapter->dev, "unable to read EDID block.\n"); - kfree(buf); - return NULL; + return -1; } EXPORT_SYMBOL(drm_do_probe_ddc_edid); -static unsigned char *drm_ddc_read(struct i2c_adapter *adapter) +/** + * Get EDID information. + * + * \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. + * + * Initialize DDC, then fetch EDID information + * by calling drm_do_probe_ddc_edid function. + */ +static int drm_ddc_read(struct i2c_adapter *adapter, + unsigned char *buf, int len) { struct i2c_algo_bit_data *algo_data = adapter->algo_data; - unsigned char *edid = NULL; int i, j; + int ret = -1; algo_data->setscl(algo_data->data, 1); @@ -616,7 +628,7 @@ static unsigned char *drm_ddc_read(struct i2c_adapter *adapter) msleep(15); /* Do the real work */ - edid = drm_do_probe_ddc_edid(adapter); + ret = drm_do_probe_ddc_edid(adapter, buf, len); algo_data->setsda(algo_data->data, 0); algo_data->setscl(algo_data->data, 0); msleep(15); @@ -632,7 +644,7 @@ static unsigned char *drm_ddc_read(struct i2c_adapter *adapter) msleep(15); algo_data->setscl(algo_data->data, 0); algo_data->setsda(algo_data->data, 0); - if (edid) + if (ret == 0) break; } /* Release the DDC lines when done or the Apple Cinema HD display @@ -641,9 +653,31 @@ static unsigned char *drm_ddc_read(struct i2c_adapter *adapter) algo_data->setsda(algo_data->data, 1); algo_data->setscl(algo_data->data, 1); - return edid; + return ret; } +static int drm_ddc_read_edid(struct drm_connector *connector, + struct i2c_adapter *adapter, + char *buf, int len) +{ + int ret; + + ret = drm_ddc_read(adapter, buf, len); + if (ret != 0) { + dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n", + drm_get_connector_name(connector)); + goto end; + } + if (!edid_is_valid((struct edid *)buf)) { + dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", + drm_get_connector_name(connector)); + ret = -1; + } +end: + return ret; +} + +#define MAX_EDID_EXT_NUM 4 /** * drm_get_edid - get EDID data, if available * @connector: connector we're probing @@ -656,27 +690,118 @@ static unsigned char *drm_ddc_read(struct i2c_adapter *adapter) struct edid *drm_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) { + int ret; struct edid *edid; - edid = (struct edid *)drm_ddc_read(adapter); - if (!edid) { - dev_info(&connector->dev->pdev->dev, "%s: no EDID data\n", - drm_get_connector_name(connector)); - return NULL; + edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1), + GFP_KERNEL); + if (edid == NULL) { + dev_warn(&connector->dev->pdev->dev, + "Failed to allocate EDID\n"); + goto end; } - if (!edid_is_valid(edid)) { - dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n", - drm_get_connector_name(connector)); - kfree(edid); - return NULL; + + /* 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 > 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, MAX_EDID_EXT_NUM, + MAX_EDID_EXT_NUM); + /* Reset EDID extension number to be read */ + edid_ext_num = 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 +/** + * drm_detect_hdmi_monitor - detect whether monitor is hdmi. + * @edid: monitor EDID information + * + * Parse the CEA extension according to CEA-861-B. + * Return true if HDMI, false if not or unknown. + */ +bool drm_detect_hdmi_monitor(struct edid *edid) +{ + char *edid_ext = NULL; + int i, hdmi_id, edid_ext_num; + int start_offset, end_offset; + bool is_hdmi = false; + + /* No EDID or EDID extensions */ + if (edid == NULL || edid->extensions == 0) + goto end; + + /* Chose real EDID extension number */ + edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ? + MAX_EDID_EXT_NUM : edid->extensions; + + /* Find CEA extension */ + for (i = 0; i < edid_ext_num; i++) { + edid_ext = (char *)edid + EDID_LENGTH * (i + 1); + /* This block is CEA extension */ + if (edid_ext[0] == 0x02) + break; + } + + if (i == edid_ext_num) + goto end; + + /* Data block offset in CEA extension block */ + start_offset = 4; + end_offset = edid_ext[2]; + + /* + * Because HDMI identifier is in Vendor Specific Block, + * search it from all data blocks of CEA extension. + */ + for (i = start_offset; i < end_offset; + /* Increased by data block len */ + i += ((edid_ext[i] & 0x1f) + 1)) { + /* Find vendor specific block */ + if ((edid_ext[i] >> 5) == VENDOR_BLOCK) { + hdmi_id = edid_ext[i + 1] | (edid_ext[i + 2] << 8) | + edid_ext[i + 3] << 16; + /* Find HDMI identifier */ + if (hdmi_id == HDMI_IDENTIFIER) + is_hdmi = true; + break; + } + } + +end: + return is_hdmi; +} +EXPORT_SYMBOL(drm_detect_hdmi_monitor); + /** * drm_add_edid_modes - add modes from EDID data, if available * @connector: connector we're probing |