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drm/i915/bios: parse SDVO device mapping from pre-parsed child devices

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We parse and store the child devices in
parse_general_definitions(). There is no need to parse the VBT block
again for SDVO device mapping. Do the same as we do in
parse_ddi_ports().

We no longer have access to child device size at this stage, but we also
don't need to worry about reading past the child device anymore. Instead
of a child device size check, do a mild optimization by limiting the
parsing to gens 3 through 7.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c918d4173dd38a165295f1270cb16c2c01bd8cd1.1506586821.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2017-09-28 11:22:03 +03:00
parent b3ca1f43b2
commit 0ebdabe612
1 changed files with 12 additions and 27 deletions
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39
drivers/gpu/drm/i915/intel_bios.c
View file

@ -442,37 +442,21 @@ parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
const struct bdb_header *bdb)
{
struct sdvo_device_mapping *mapping;
const struct bdb_general_definitions *defs;
const struct child_device_config *child;
int i, child_device_num, count;
u16 block_size;
defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
if (!defs) {
DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
return;
}
int i, count = 0;
/*
* Only parse SDVO mappings when the general definitions block child
* device size matches that of the *legacy* child device config
* struct. Thus, SDVO mapping will be skipped for newer VBT.
* Only parse SDVO mappings on gens that could have SDVO. This isn't
* accurate and doesn't have to be, as long as it's not too strict.
*/
if (defs->child_dev_size != LEGACY_CHILD_DEVICE_CONFIG_SIZE) {
DRM_DEBUG_KMS("Unsupported child device size for SDVO mapping.\n");
if (!IS_GEN(dev_priv, 3, 7)) {
DRM_DEBUG_KMS("Skipping SDVO device mapping\n");
return;
}
/* get the block size of general definitions */
block_size = get_blocksize(defs);
/* get the number of child device */
child_device_num = (block_size - sizeof(*defs)) / defs->child_dev_size;
count = 0;
for (i = 0; i < child_device_num; i++) {
child = child_device_ptr(defs, i);
if (!child->device_type) {
/* skip the device block if device type is invalid */
continue;
}
for (i = 0, count = 0; i < dev_priv->vbt.child_dev_num; i++) {
child = dev_priv->vbt.child_dev + i;
if (child->slave_addr != SLAVE_ADDR1 &&
child->slave_addr != SLAVE_ADDR2) {
/*
@ -523,7 +507,6 @@ parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
/* No SDVO device info is found */
DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
}
return;
}
static void
@ -1506,12 +1489,14 @@ void intel_bios_init(struct drm_i915_private *dev_priv)
parse_lfp_panel_data(dev_priv, bdb);
parse_lfp_backlight(dev_priv, bdb);
parse_sdvo_panel_data(dev_priv, bdb);
parse_sdvo_device_mapping(dev_priv, bdb);
parse_driver_features(dev_priv, bdb);
parse_edp(dev_priv, bdb);
parse_psr(dev_priv, bdb);
parse_mipi_config(dev_priv, bdb);
parse_mipi_sequence(dev_priv, bdb);
/* Further processing on pre-parsed data */
parse_sdvo_device_mapping(dev_priv, bdb);
parse_ddi_ports(dev_priv, bdb);
out: