From 38cb82222c9bc5cfae9c679ee4171fae3947b067 Mon Sep 17 00:00:00 2001 From: Kyösti Mälkki Date: Fri, 18 Nov 2016 19:25:52 +0200 Subject: intel sandy/ivy: Skip SPD loading on S3 resume path MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit For S3 resume path SPD is only used for DIMM replacement detection. As this detection already fails in the case of removal/insertion of same DIMM, we can rely on cbmem_recovery() failure alone to force system reset in case someone accidentally does DIMM replacements while system is suspend-to-ram stage. Skipping DIMM replacement detection allows skipping slow SPD loading, thus reducing S3 resume path time by 80ms for every installed DIMM. Change-Id: I4f2838c05f172d3cb351b027c9b8dd6543ab5944 Signed-off-by: Kyösti Mälkki Reviewed-on: https://review.coreboot.org/17490 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Patrick Rudolph Reviewed-by: Aaron Durbin --- src/northbridge/intel/sandybridge/raminit.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) (limited to 'src/northbridge/intel/sandybridge') diff --git a/src/northbridge/intel/sandybridge/raminit.c b/src/northbridge/intel/sandybridge/raminit.c index c01bc253db..63e951f00a 100644 --- a/src/northbridge/intel/sandybridge/raminit.c +++ b/src/northbridge/intel/sandybridge/raminit.c @@ -4235,22 +4235,21 @@ static void init_dram_ddr3(int mobile, int min_tck, int s3resume) ctrl_cached = (ramctr_timing *)mrc_cache->mrc_data; } - memset(spds, 0, sizeof(spds)); - mainboard_get_spd(spds); + + if (!s3resume) { + memset(spds, 0, sizeof(spds)); + mainboard_get_spd(spds); + } /* verify MRC cache for fast boot */ - if (ctrl_cached) { + if (!s3resume && ctrl_cached) { /* check SPD CRC16 to make sure the DIMMs haven't been replaced */ fast_boot = verify_crc16_spds_ddr3(spds, ctrl_cached); if (!fast_boot) printk(BIOS_DEBUG, "Stored timings CRC16 mismatch.\n"); - if (!fast_boot && s3resume) { - /* Failed S3 resume, reset to come up cleanly */ - outb(0x6, 0xcf9); - halt(); - } - } else - fast_boot = 0; + } else { + fast_boot = s3resume; + } if (fast_boot) { printk(BIOS_DEBUG, "Trying stored timings.\n"); -- cgit v1.2.3