diff options
| author |   Jani Nikula <jani.nikula@intel.com> | 2015-12-21 15:10:55 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2016-01-05 14:58:57 +0200 |
| commit | 08c0888b28d75cf4ee9ca0bbe1a2c55ddef87423 (patch) | |
| tree | 5be0f0fc3bff80c27c3278661dd717cac96d1341 /drivers/gpu/drm/i915/intel_bios.c | |
| parent | drm/i915/bios: split the MIPI DSI VBT block parsing to two (diff) | |
| download | linux-dev-08c0888b28d75cf4ee9ca0bbe1a2c55ddef87423.tar.xz linux-dev-08c0888b28d75cf4ee9ca0bbe1a2c55ddef87423.zip | |
drm/i915/bios: have get_blocksize() support MIPI sequence block v3+
Have get_blocksize() support the special case of MIPI sequence block v3+
which has a separate field for size. Provide and use abstractions for
getting the blocksize given a pointer to the block "envelope",
i.e. pointer to the block id, and given a pointer to the block payload
data.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/e935bd5e119a83dd91214c47e6cd4f6ce8b2a17e.1450702954.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_bios.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_bios.c | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 5ea6087c40c1..961ae7f6d075 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -58,6 +58,22 @@ static int panel_type; +/* Get BDB block size given a pointer to Block ID. */ +static u32 _get_blocksize(const u8 *block_base) +{ + /* The MIPI Sequence Block v3+ has a separate size field. */ + if (*block_base == BDB_MIPI_SEQUENCE && *(block_base + 3) >= 3) + return *((const u32 *)(block_base + 4)); + else + return *((const u16 *)(block_base + 1)); +} + +/* Get BDB block size give a pointer to data after Block ID and Block Size. */ +static u32 get_blocksize(const void *block_data) +{ + return _get_blocksize(block_data - 3); +} + static const void * find_section(const void *_bdb, int section_id) { @@ -74,14 +90,8 @@ find_section(const void *_bdb, int section_id) /* walk the sections looking for section_id */ while (index + 3 < total) { current_id = *(base + index); - index++; - - current_size = *((const u16 *)(base + index)); - index += 2; - - /* The MIPI Sequence Block v3+ has a separate size field. */ - if (current_id == BDB_MIPI_SEQUENCE && *(base + index) >= 3) - current_size = *((const u32 *)(base + index + 1)); + current_size = _get_blocksize(base + index); + index += 3; if (index + current_size > total) return NULL; @@ -95,16 +105,6 @@ find_section(const void *_bdb, int section_id) return NULL; } -static u16 -get_blocksize(const 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, const struct lvds_dvo_timing *dvo_timing) |