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rockchip/rk3399: set CA drive strength to 48ohms

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As shown in testing, if CA use 34.3ohms drive strength, it leads
to an overshoot. To fix this, change the drive strength to 48 ohms.

BRANCH=none
BUG=chrome-os-partner:54871
TEST=run "stressapptest -M 1024 -s 1000" on kevin board and pass

Change-Id: I231f5b1bd45ff262686fbacbaf119a8a57fad27b
Signed-off-by: Lin Huang <hl@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/358761
Commit-Ready: Dan Shi <dshi@chromium.org>
Tested-by: Caesar Wang <wxt@rock-chips.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Lin Huang 2016-07-07 19:19:48 +08:00 • committed by chrome-bot
parent 63bd654105
commit fbc1c13f9a
1 changed files with 8 additions and 1 deletions
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9
src/soc/rockchip/rk3399/sdram.c
View file

@ -182,32 +182,39 @@ static void set_ds_odt(u32 channel,
u32 tsel_idle_en, tsel_wr_en, tsel_rd_en;
u32 tsel_idle_select_p, tsel_wr_select_p, tsel_rd_select_p;
u32 ca_tsel_wr_select_p, ca_tsel_wr_select_n;
u32 tsel_idle_select_n, tsel_wr_select_n, tsel_rd_select_n;
u32 reg_value;
if (sdram_params->dramtype == LPDDR4) {
tsel_rd_select_p = PHY_DRV_ODT_Hi_Z;
tsel_wr_select_p = PHY_DRV_ODT_40;
ca_tsel_wr_select_p = PHY_DRV_ODT_40;
tsel_idle_select_p = PHY_DRV_ODT_Hi_Z;
tsel_rd_select_n = PHY_DRV_ODT_240;
tsel_wr_select_n = PHY_DRV_ODT_40;
ca_tsel_wr_select_n = PHY_DRV_ODT_40;
tsel_idle_select_n = PHY_DRV_ODT_240;
} else if (sdram_params->dramtype == LPDDR3) {
tsel_rd_select_p = PHY_DRV_ODT_240;
tsel_wr_select_p = PHY_DRV_ODT_34_3;
ca_tsel_wr_select_p = PHY_DRV_ODT_48;
tsel_idle_select_p = PHY_DRV_ODT_240;
tsel_rd_select_n = PHY_DRV_ODT_Hi_Z;
tsel_wr_select_n = PHY_DRV_ODT_34_3;
ca_tsel_wr_select_n = PHY_DRV_ODT_48;
tsel_idle_select_n = PHY_DRV_ODT_Hi_Z;
} else {
tsel_rd_select_p = PHY_DRV_ODT_240;
tsel_wr_select_p = PHY_DRV_ODT_34_3;
ca_tsel_wr_select_p = PHY_DRV_ODT_34_3;
tsel_idle_select_p = PHY_DRV_ODT_240;
tsel_rd_select_n = PHY_DRV_ODT_240;
tsel_wr_select_n = PHY_DRV_ODT_34_3;
ca_tsel_wr_select_n = PHY_DRV_ODT_34_3;
tsel_idle_select_n = PHY_DRV_ODT_240;
}
@ -243,7 +250,7 @@ static void set_ds_odt(u32 channel,
clrsetbits_le32(&denali_phy[391], 0xffffff, reg_value);
/* phy_adr_tsel_select_ 8bits DENALI_PHY_544/672/800 offset_0 */
reg_value = tsel_wr_select_n | (tsel_wr_select_p << 0x4);
reg_value = ca_tsel_wr_select_n | (ca_tsel_wr_select_p << 0x4);
clrsetbits_le32(&denali_phy[544], 0xff, reg_value);
clrsetbits_le32(&denali_phy[672], 0xff, reg_value);
clrsetbits_le32(&denali_phy[800], 0xff, reg_value);