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| author | Eric Lai <ericr_lai@compal.corp-partner.google.com> | 2020-04-21 15:32:20 +0800 |
|---|---|---|
| committer | Tim Wawrzynczak <twawrzynczak@chromium.org> | 2020-04-28 16:23:15 +0000 |
| commit | 0ee9b14c09c4dfeb59ad94315051ae423b26384d (patch) | |
| tree | 6be8c5a251b7e83808e36b138cceffc3cb4fb4c9 /src/soc | |
| parent | d2b2be39296d910178173273017800a1b054a1ba (diff) | |
| download | coreboot-0ee9b14c09c4dfeb59ad94315051ae423b26384d.tar.xz | |
soc/intel/common/block/smbus: Set SPD array NULL if no DIMM present
Set SPD array NULL if no DIMM present. do_smbus_read_byte returns
negative value if SMBus transaction fails.
BUG=b:154445630,b:151702387
TEST=Check SPD is NULL if no DIMM in the slot.
Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: Ie81adbfab5bb1d5c557fe549a158cb68e26b1162
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40558
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'src/soc')
| -rw-r--r-- | src/soc/intel/common/block/smbus/smbuslib.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/soc/intel/common/block/smbus/smbuslib.c b/src/soc/intel/common/block/smbus/smbuslib.c index 4db2c6e7a4..5f60ddcab3 100644 --- a/src/soc/intel/common/block/smbus/smbuslib.c +++ b/src/soc/intel/common/block/smbus/smbuslib.c @@ -38,14 +38,14 @@ static void smbus_read_spd(u8 *spd, u8 addr) } } -static void get_spd(u8 *spd, u8 addr) +/* return -1 if SMBus errors otherwise return 0 */ +static int get_spd(u8 *spd, u8 addr) { - if (do_smbus_read_byte(SMBUS_IO_BASE, addr, 0) == 0xff) { + /* If address is not 0, it will return CB_ERR(-1) if no dimm */ + if (do_smbus_read_byte(SMBUS_IO_BASE, addr, 0) < 0) { printk(BIOS_INFO, "No memory dimm at address %02X\n", addr << 1); - /* Make sure spd is zeroed if dimm doesn't exist. */ - memset(spd, 0, CONFIG_DIMM_SPD_SIZE); - return; + return -1; } smbus_read_spd(spd, addr); @@ -58,6 +58,7 @@ static void get_spd(u8 *spd, u8 addr) /* Restore to page 0 */ do_smbus_write_byte(SMBUS_IO_BASE, SPD_PAGE_0, 0, 0); } + return 0; } static u8 spd_data[CONFIG_DIMM_MAX * CONFIG_DIMM_SPD_SIZE]; @@ -66,9 +67,15 @@ void get_spd_smbus(struct spd_block *blk) { u8 i; for (i = 0 ; i < CONFIG_DIMM_MAX; i++) { - get_spd(&spd_data[i * CONFIG_DIMM_SPD_SIZE], - blk->addr_map[i]); - blk->spd_array[i] = &spd_data[i * CONFIG_DIMM_SPD_SIZE]; + if (blk->addr_map[i] == 0) { + blk->spd_array[i] = NULL; + continue; + } + + if (get_spd(&spd_data[i * CONFIG_DIMM_SPD_SIZE], blk->addr_map[i]) == 0) + blk->spd_array[i] = &spd_data[i * CONFIG_DIMM_SPD_SIZE]; + else + blk->spd_array[i] = NULL; } update_spd_len(blk); |