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soc/intel/cannonlake: Do not read SPD again if index hasn't changed 

With the recent refactoring of memory configuration in
CB:32513 ("soc/intel/cannonlake: Support different SPD read type for
each slot"), meminit_cbfs_spd_index ends up reading SPD from CBFS for
each slot. However, for mainboards that use the same SPD index for
each slot this is unneccessary. This change adds a check to see if
spd_data_ptr is not NULL and current spd index is the same as the last
call to decide if SPD read from CBFS should be skipped.

TEST=Verified that SPD gets read only once on hatch.

Change-Id: I91963b55cea534c92207b2cd9f0caa96df8f222b
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33137
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Philip Chen <philipchen@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Furquan Shaikh 2019-05-30 17:24:12 -07:00
parent ef1ab4d6d4
commit b2709ae0ae
1 changed files with 21 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
src/soc/intel/cannonlake/cnl_memcfg_init.c
View File

@ -91,18 +91,29 @@ static void meminit_spd_data(FSP_M_CONFIG *mem_cfg, uint8_t mem_slot,
static void meminit_cbfs_spd_index(FSP_M_CONFIG *mem_cfg,
int spd_index, uint8_t mem_slot)
{
size_t spd_data_len;
uintptr_t spd_data_ptr;
struct region_device spd_rdev;
static size_t spd_data_len;
static uintptr_t spd_data_ptr;
static int last_spd_index;
assert(mem_slot < NUM_DIMM_SLOT);
if ((spd_data_ptr == 0) || (last_spd_index != spd_index)) {
struct region_device spd_rdev;
printk(BIOS_DEBUG, "SPD INDEX = %d\n", spd_index);
if (get_spd_cbfs_rdev(&spd_rdev, spd_index) < 0)
die("spd.bin not found or incorrect index\n");
spd_data_len = region_device_sz(&spd_rdev);
/* Memory leak is ok since we have memory mapped boot media */
assert(CONFIG(BOOT_DEVICE_MEMORY_MAPPED));
spd_data_ptr = (uintptr_t)rdev_mmap_full(&spd_rdev);
last_spd_index = spd_index;
}
meminit_spd_data(mem_cfg, mem_slot, spd_data_len, spd_data_ptr);
}