soc/mediatek/mt8183: Pass impedance data as a function argument

To make data flow more explicit, global variable 'impedance' is replaced
with a local variable, which is passed as a function argument.

BUG=none
BRANCH=kukui
TEST=Krane boots correctly

Change-Id: I0f6dacc33fda013a3476a10d9899821b7297e770
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35766
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/soc/mediatek/mt8183/include/soc/emi.h b/src/soc/mediatek/mt8183/include/soc/emi.h
index 1a364fb7a6ac..1b894803bd8a 100644
--- a/src/soc/mediatek/mt8183/include/soc/emi.h
+++ b/src/soc/mediatek/mt8183/include/soc/emi.h
@@ -82,6 +82,10 @@ enum {
 	LP4X_DDRFREQ_MAX,
 };
 
+struct dram_impedance {
+	u32 data[ODT_MAX][4];
+};
+
 extern const u8 phy_mapping[CHANNEL_MAX][16];
 
 int complex_mem_test(u8 *start, unsigned int len);