The general definition block contains the child device tables, which include the SDVO device info. For example: device slave address, device dvo port, device type. We will get the info of SDVO device by parsing the general definition blocks. Only when a valid slave address is found, it is regarded as the SDVO device. And the info of DVO port and slave address is recorded.
http://bugs.freedesktop.org/show_bug.cgi?id=20429 Signed-off-by: Zhao Yakui <yakui.z...@intel.com> --- drivers/gpu/drm/i915/i915_drv.h | 8 +++ drivers/gpu/drm/i915/intel_bios.c | 86 +++++++++++++++++++++++++++++++++++++- 2 files changed, 93 insertions(+), 1 deletion(-) Index: linux-2.6/drivers/gpu/drm/i915/i915_drv.h =================================================================== --- linux-2.6.orig/drivers/gpu/drm/i915/i915_drv.h 2009-05-27 08:40:17.000000000 +0800 +++ linux-2.6/drivers/gpu/drm/i915/i915_drv.h 2009-05-31 15:59:52.000000000 +0800 @@ -126,6 +126,13 @@ struct drm_gem_object *obj; }; +struct sdvo_device_mapping { + u8 dvo_port; + u8 slave_addr; + u8 dvo_wiring; + u8 initialized; +}; + typedef struct drm_i915_private { struct drm_device *dev; @@ -382,6 +389,7 @@ /* storage for physical objects */ struct drm_i915_gem_phys_object *phys_objs[I915_MAX_PHYS_OBJECT]; } mm; + struct sdvo_device_mapping sdvo_mappings[2]; } drm_i915_private_t; /** driver private structure attached to each drm_gem_object */ Index: linux-2.6/drivers/gpu/drm/i915/intel_bios.c =================================================================== --- linux-2.6.orig/drivers/gpu/drm/i915/intel_bios.c 2009-05-27 08:40:17.000000000 +0800 +++ linux-2.6/drivers/gpu/drm/i915/intel_bios.c 2009-05-31 17:04:45.000000000 +0800 @@ -30,6 +30,8 @@ #include "i915_drv.h" #include "intel_bios.h" +#define SLAVE_ADDR1 0x70 +#define SLAVE_ADDR2 0x72 static void * find_section(struct bdb_header *bdb, int section_id) @@ -193,6 +195,88 @@ } } +static void +parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, + struct bdb_header *bdb) +{ + struct sdvo_device_mapping *p_mapping; + struct bdb_general_definitions *p_defs; + struct child_device_config *p_child; + int i, child_device_num, count; + u16 block_size, *block_ptr; + + p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); + if (!p_defs) { + DRM_DEBUG("No general definition block is found\n"); + return; + } + /* judge whether the size of child device meets the requirements. + * If the child device size obtained from general definition block + * is different with sizeof(struct child_device_config), skip the + * parsing of sdvo device info + */ + if (p_defs->child_dev_size != sizeof(*p_child)) { + /* different child dev size . Ignore it */ + DRM_DEBUG("different child size is found. Invalid.\n"); + return; + } + /* get the block size of general definitions */ + block_ptr = (u16 *)((char *)p_defs - 2); + block_size = *block_ptr; + /* get the number of child device */ + child_device_num = (block_size - sizeof(*p_defs)) / + sizeof(*p_child); + count = 0; + for (i = 0; i < child_device_num; i++) { + p_child = &(p_defs->devices[i]); + if (!p_child->device_type) { + /* skip the device block if device type is invalid */ + continue; + } + if (p_child->slave_addr != SLAVE_ADDR1 && + p_child->slave_addr != SLAVE_ADDR2) { + /* + * If the slave address is neither 0x70 nor 0x72, + * it is not a SDVO device. Skip it. + */ + continue; + } + if (p_child->dvo_port != DEVICE_PORT_DVOB && + p_child->dvo_port != DEVICE_PORT_DVOC) { + /* skip the incorrect SDVO port */ + DRM_DEBUG("Incorrect SDVO port. Skip it \n"); + continue; + } + DRM_DEBUG("the SDVO device with slave addr %2x is found on " + "%s port\n", + p_child->slave_addr, + (p_child->dvo_port == DEVICE_PORT_DVOB) ? + "SDVOB" : "SDVOC"); + p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]); + if (!p_mapping->initialized) { + p_mapping->dvo_port = p_child->dvo_port; + p_mapping->slave_addr = p_child->slave_addr; + p_mapping->dvo_wiring = p_child->dvo_wiring; + p_mapping->initialized = 1; + } else { + DRM_DEBUG("Maybe one SDVO port is shared by " + "two SDVO device.\n"); + } + if (p_child->slave2_addr) { + /* Maybe this is a SDVO device with multiple inputs */ + /* And the mapping info is not added */ + DRM_DEBUG("there exists the slave2_addr. Maybe this " + "is a SDVO device with multiple inputs.\n"); + } + count++; + } + + if (!count) { + /* No SDVO device info is found */ + DRM_DEBUG("No SDVO device info is found in VBT\n"); + } + return; +} /** * intel_init_bios - initialize VBIOS settings & find VBT * @dev: DRM device @@ -242,7 +326,7 @@ parse_general_features(dev_priv, bdb); parse_lfp_panel_data(dev_priv, bdb); parse_sdvo_panel_data(dev_priv, bdb); - + parse_sdvo_device_mapping(dev_priv, bdb); pci_unmap_rom(pdev, bios); return 0; ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
