diff options
Diffstat (limited to 'src/soc/intel/broadwell/igd.c')
| -rw-r--r-- | src/soc/intel/broadwell/igd.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/soc/intel/broadwell/igd.c b/src/soc/intel/broadwell/igd.c index 8235b3f3df..eac9ac1ec1 100644 --- a/src/soc/intel/broadwell/igd.c +++ b/src/soc/intel/broadwell/igd.c @@ -472,6 +472,7 @@ static void igd_init(struct device *dev) { int is_broadwell = !!(cpu_family_model() == BROADWELL_FAMILY_ULT); u32 rp1_gfx_freq; + extern int oprom_is_loaded; /* IGD needs to be Bus Master */ u32 reg32 = pci_read_config32(dev, PCI_COMMAND); @@ -510,6 +511,18 @@ static void igd_init(struct device *dev) igd_cdclk_init_haswell(dev); reg_script_run_on_dev(dev, haswell_late_init_script); } + + if (!oprom_is_loaded) { + /* + * Enable DDI-A if the Option ROM did not execute: + * + * bit 0: Display detected (RO) + * bit 4: DDI A supports 4 lanes and DDI E is not used + * bit 7: DDI buffer is idle + */ + gtt_write(DDI_BUF_CTL_A, DDI_BUF_IS_IDLE | DDI_A_4_LANES | + DDI_INIT_DISPLAY_DETECTED); + } } static void igd_read_resources(struct device *dev) |