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nb/intel/sandybridge/raminit: Support CL > 11 

The code won't allow anything beyond CL11 due to short
CAS Latency mask and a bug in mr0 which had the wrong
bit set for CL > 11.

Increase the CAS bitmask, fix the mr0 reg to allow CAS Latencies
from CL 5 to CL 18.
Use defines instead of hardcoding min and max CAS latencies.

Tested on X220 with two 1866 MHz, CL13 memories
Tested-By: Nicola Corna <nicola@corna.info>

Change-Id: I576ee20a923fd63d360a6a8e86c675dd069d53d6
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/17502
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
This commit is contained in:
Patrick Rudolph 2016-11-19 15:46:42 +01:00 committed by Martin Roth
parent ca387539b5
commit 2966c99589
1 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
src/northbridge/intel/sandybridge/raminit.c
View File

@ -199,6 +199,8 @@ typedef struct ramctr_timing_st {
#define MAX_TIMC 127
#define MAX_TIMB 511
#define MAX_TIMA 127
#define MAX_CAS 18
#define MIN_CAS 4
#define MAKE_ERR ((channel<<16)|(slotrank<<8)|1)
#define GET_ERR_CHANNEL(x) (x>>16)
@ -468,7 +470,7 @@ static void dram_find_common_params(ramctr_timing *ctrl)
int channel, slot;
dimm_info *dimms = &ctrl->info;
ctrl->cas_supported = 0xff;
ctrl->cas_supported = (1 << (MAX_CAS - MIN_CAS + 1)) - 1;
valid_dimms = 0;
FOR_ALL_CHANNELS for (slot = 0; slot < 2; slot++) {
const dimm_attr *dimm = &dimms->dimm[channel][slot];
@ -742,16 +744,16 @@ static void dram_timing(ramctr_timing * ctrl)
val = (ctrl->tAA + ctrl->tCK - 1) / ctrl->tCK;
printk(BIOS_DEBUG, "Minimum CAS latency : %uT\n", val);
/* Find lowest supported CAS latency that satisfies the minimum value */
while (!((ctrl->cas_supported >> (val - 4)) & 1)
&& (ctrl->cas_supported >> (val - 4))) {
while (!((ctrl->cas_supported >> (val - MIN_CAS)) & 1)
&& (ctrl->cas_supported >> (val - MIN_CAS))) {
val++;
}
/* Is CAS supported */
if (!(ctrl->cas_supported & (1 << (val - 4)))) {
if (!(ctrl->cas_supported & (1 << (val - MIN_CAS)))) {
printk(BIOS_ERR, "CAS %uT not supported. ", val);
val = 18;
val = MAX_CAS;
/* Find highest supported CAS latency */
while (!((ctrl->cas_supported >> (val - 4)) & 1))
while (!((ctrl->cas_supported >> (val - MIN_CAS)) & 1))
val--;
printk(BIOS_ERR, "Using CAS %uT instead.\n", val);
@ -1467,7 +1469,7 @@ static u32 make_mr0(ramctr_timing * ctrl, u8 rank)
// Convert tWR to MCH register friendly
mch_wr = mch_wr_t[ctrl->tWR - 5];
mr0reg = (mr0reg & ~0x4) | (mch_cas & 0x1);
mr0reg = (mr0reg & ~0x4) | ((mch_cas & 0x1) << 2);
mr0reg = (mr0reg & ~0x70) | ((mch_cas & 0xe) << 3);
mr0reg = (mr0reg & ~0xe00) | (mch_wr << 9);