diff options
| -rw-r--r-- | src/northbridge/intel/x4x/raminit.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/northbridge/intel/x4x/raminit.c b/src/northbridge/intel/x4x/raminit.c index 9e649b0ec4..d41b74c8db 100644 --- a/src/northbridge/intel/x4x/raminit.c +++ b/src/northbridge/intel/x4x/raminit.c @@ -352,6 +352,26 @@ static void select_cas_dramfreq_ddr3(struct sysinfo *s, } } +/* With DDR3 and 533MHz mem clock and an enabled internal gfx device the display + is not usable in non stacked mode, so select stacked mode accordingly */ +static void workaround_stacked_mode(struct sysinfo *s) +{ + u32 deven; + /* Only a problem on DDR3 */ + if (s->spd_type == DDR2) + return; + /* Does not matter if only one channel is populated */ + if (!CHANNEL_IS_POPULATED(s->dimms, 0) + || !CHANNEL_IS_POPULATED(s->dimms, 1)) + return; + if (s->selected_timings.mem_clk != MEM_CLOCK_1066MHz) + return; + /* IGD0EN gets disabled if not present before this code runs */ + deven = pci_read_config32(PCI_DEV(0, 0, 0), D0F0_DEVEN); + if (deven & IGD0EN) + s->stacked_mode = 1; +} + static int ddr3_save_dimminfo(u8 dimm_idx, u8 *raw_spd, struct abs_timings *saved_timings, struct sysinfo *s) { @@ -544,6 +564,7 @@ static void decode_spd_select_timings(struct sysinfo *s) else select_cas_dramfreq_ddr3(s, &saved_timings); select_discrete_timings(s, &saved_timings); + workaround_stacked_mode(s); } static void find_dimm_config(struct sysinfo *s) |