soc/intel/apollolake: add dual rank option to meminit

Despite the UPD comments the Chx_RankEnable fields are a bit
mask which indicates which ranks are enabled for physical
channel. Add the ability to set the rank mask correctly for
dual rank LPDDR4 modules.

BUG=chrome-os-partner:55446

Change-Id: I9dbed7bb6a4b512e57f6b4481180932a7cce91ff
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15771
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/soc/intel/apollolake/include/soc/meminit.h b/src/soc/intel/apollolake/include/soc/meminit.h
index 94c90328d0..b619b95642 100644
--- a/src/soc/intel/apollolake/include/soc/meminit.h
+++ b/src/soc/intel/apollolake/include/soc/meminit.h
@@ -92,13 +92,15 @@ void meminit_lpddr4(struct FSP_M_CONFIG *cfg, int speed);
  * to the memory reference code.
  */
 void meminit_lpddr4_enable_channel(struct FSP_M_CONFIG *cfg, int logical_chan,
-					int device_density,
+					int device_density, int dual_rank,
 					const struct lpddr4_swizzle_cfg *scfg);
 
 struct lpddr4_sku {
 	int speed;
 	int ch0_density;
 	int ch1_density;
+	int ch0_dual_rank;
+	int ch1_dual_rank;
 };
 
 struct lpddr4_cfg {