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drm/i915: parse VBT general definition block to get the SDVO device info

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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.zhao@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
yakui_zhao 2009-05-31 17:17:17 +08:00 committed by Eric Anholt
parent 59a036cfbd
commit 9b9d172d06
2 changed files with 93 additions and 1 deletions
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8
drivers/gpu/drm/i915/i915_drv.h
View File

@ -126,6 +126,13 @@ struct drm_i915_fence_reg {
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;
@ -389,6 +396,7 @@ typedef struct drm_i915_private {
/* 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 */

86
drivers/gpu/drm/i915/intel_bios.c
View File

@ -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 @@ parse_general_features(struct drm_i915_private *dev_priv,
}
}
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 @@ intel_init_bios(struct drm_device *dev)
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;