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author | David Müller (ELSOFT AG) <d.mueller@elsoft.ch> | 2009-08-29 08:54:45 +0200 |
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committer | Eric Anholt <eric@anholt.net> | 2009-08-29 18:23:40 -0700 |
commit | db54501900ad3665dd669f5708ecd04fc5aed495 (patch) | |
tree | 023eac651618698ab37f3e3112f957a07b6192eb /drivers/gpu/drm/i915/intel_bios.c | |
parent | a09ba7faf75fa4b21980d81de8e5f3d5c0785ccf (diff) | |
download | linux-db54501900ad3665dd669f5708ecd04fc5aed495.tar.gz linux-db54501900ad3665dd669f5708ecd04fc5aed495.tar.bz2 linux-db54501900ad3665dd669f5708ecd04fc5aed495.zip |
drm/i915: Improve CRTDDC mapping by using VBT info
Use VBT information to determine which DDC bus to use for CRTDCC.
Fall back to GPIOA if VBT info is not available.
Signed-off-by: David Müller <d.mueller@elsoft.ch>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Tested on: 855 (David), and 945GM, 965GM, GM45, and G45 (anholt)
Diffstat (limited to 'drivers/gpu/drm/i915/intel_bios.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_bios.c | 51 |
1 files changed, 48 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 300aee3296c2..f806fcc54e09 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -59,6 +59,16 @@ find_section(struct bdb_header *bdb, int section_id) return NULL; } +static u16 +get_blocksize(void *p) +{ + u16 *block_ptr, block_size; + + block_ptr = (u16 *)((char *)p - 2); + block_size = *block_ptr; + return block_size; +} + static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode, struct lvds_dvo_timing *dvo_timing) @@ -215,6 +225,41 @@ parse_general_features(struct drm_i915_private *dev_priv, } static void +parse_general_definitions(struct drm_i915_private *dev_priv, + struct bdb_header *bdb) +{ + struct bdb_general_definitions *general; + const int crt_bus_map_table[] = { + GPIOB, + GPIOA, + GPIOC, + GPIOD, + GPIOE, + GPIOF, + }; + + /* Set sensible defaults in case we can't find the general block + or it is the wrong chipset */ + dev_priv->crt_ddc_bus = -1; + + general = find_section(bdb, BDB_GENERAL_DEFINITIONS); + if (general) { + u16 block_size = get_blocksize(general); + if (block_size >= sizeof(*general)) { + int bus_pin = general->crt_ddc_gmbus_pin; + DRM_DEBUG("crt_ddc_bus_pin: %d\n", bus_pin); + if ((bus_pin >= 1) && (bus_pin <= 6)) { + dev_priv->crt_ddc_bus = + crt_bus_map_table[bus_pin-1]; + } + } else { + DRM_DEBUG("BDB_GD too small (%d). Invalid.\n", + block_size); + } + } +} + +static void parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, struct bdb_header *bdb) { @@ -222,7 +267,7 @@ parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, struct bdb_general_definitions *p_defs; struct child_device_config *p_child; int i, child_device_num, count; - u16 block_size, *block_ptr; + u16 block_size; p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS); if (!p_defs) { @@ -240,8 +285,7 @@ parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, return; } /* get the block size of general definitions */ - block_ptr = (u16 *)((char *)p_defs - 2); - block_size = *block_ptr; + block_size = get_blocksize(p_defs); /* get the number of child device */ child_device_num = (block_size - sizeof(*p_defs)) / sizeof(*p_child); @@ -362,6 +406,7 @@ intel_init_bios(struct drm_device *dev) /* Grab useful general definitions */ parse_general_features(dev_priv, bdb); + parse_general_definitions(dev_priv, bdb); parse_lfp_panel_data(dev_priv, bdb); parse_sdvo_panel_data(dev_priv, bdb); parse_sdvo_device_mapping(dev_priv, bdb); |