diff options
Diffstat (limited to 'src/i830_bios.c')
| -rw-r--r-- | src/i830_bios.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/i830_bios.c b/src/i830_bios.c index 57ee2782..a8193fc5 100644 --- a/src/i830_bios.c +++ b/src/i830_bios.c @@ -70,6 +70,32 @@ i830DumpBIOSToFile(ScrnInfoPtr pScrn, unsigned char *bios) fclose(f); } +static void * +find_section(struct bdb_header *bdb, int section_id) +{ + unsigned char *base = (unsigned char *)bdb; + int index = 0; + uint16_t total, current_size; + unsigned char current_id; + + /* skip to first section */ + index += bdb->header_size; + total = bdb->bdb_size; + + /* walk the sections looking for section_id */ + while (index < total) { + current_id = *(base + index); + index++; + current_size = *((uint16_t *)(base + index)); + index += 2; + if (current_id == section_id) + return base + index; + index += current_size; + } + + return NULL; +} + /** * Loads the Video BIOS and checks that the VBT exists. * @@ -127,6 +153,70 @@ i830_bios_get (ScrnInfoPtr pScrn) return bios; } +void +i830_bios_get_ssc(ScrnInfoPtr pScrn) +{ + I830Ptr pI830 = I830PTR(pScrn); + struct vbt_header *vbt; + struct bdb_header *bdb; + struct bdb_general_features *bdb_features; + int vbt_off, bdb_off; + unsigned char *bios; + + bios = i830_bios_get(pScrn); + + if (bios == NULL) + return; + + vbt_off = INTEL_BIOS_16(0x1a); + vbt = (struct vbt_header *)(bios + vbt_off); + bdb_off = vbt_off + vbt->bdb_offset; + bdb = (struct bdb_header *)(bios + bdb_off); + + bdb_features = find_section(bdb, BDB_GENERAL_FEATURES); + if (!bdb_features) + return; + + pI830->lvds_use_ssc = bdb_features->enable_ssc; + if (pI830->lvds_use_ssc) { + if (IS_I855(pI830)) + pI830->lvds_ssc_freq = bdb_features->ssc_freq ? 66 : 48; + else + pI830->lvds_ssc_freq = bdb_features->ssc_freq ? 100 : 96; + } + + xfree(bios); +} + +void +i830_bios_get_tv(ScrnInfoPtr pScrn) +{ + I830Ptr pI830 = I830PTR(pScrn); + struct vbt_header *vbt; + struct bdb_header *bdb; + struct bdb_general_features *bdb_features; + int vbt_off, bdb_off; + unsigned char *bios; + + bios = i830_bios_get(pScrn); + + if (bios == NULL) + return; + + vbt_off = INTEL_BIOS_16(0x1a); + vbt = (struct vbt_header *)(bios + vbt_off); + bdb_off = vbt_off + vbt->bdb_offset; + bdb = (struct bdb_header *)(bios + bdb_off); + + bdb_features = find_section(bdb, BDB_GENERAL_FEATURES); + if (!bdb_features) + return; + + pI830->tv_present = bdb_features->int_tv_support; + + xfree(bios); +} + /** * Returns the BIOS's fixed panel mode. * |