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tcpm: anx74xx: Improve CC eye diagram

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BUG=None
TEST=Observe improvement on CC eye diagram
BRANCH=None

Change-Id: Ic7ab68427eb235c889c547a7d2a485047edce77d
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/358104
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2016-07-01 16:21:46 -07:00
committed by chrome-bot
parent 3f9ee35859
commit e186c770f7
2 changed files with 10 additions and 0 deletions
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8
driver/tcpm/anx74xx.c
View File

@@ -778,6 +778,14 @@ int anx74xx_tcpm_init(int port)
/* HPD pin output enable*/
rv |= tcpc_write(port, ANX74XX_REG_HPD_CTRL_0, ANX74XX_REG_HPD_DEFAULT);
if (rv)
return EC_ERROR_UNKNOWN;
/* Decrease BMC TX lowest swing voltage */
rv |= tcpc_read(port, ANX74XX_REG_ANALOG_CTRL_11, &reg);
if (rv)
return EC_ERROR_UNKNOWN;
rv = tcpc_write(port, ANX74XX_REG_ANALOG_CTRL_11, (reg & 0x3f) | 0x40);
if (rv)
return EC_ERROR_UNKNOWN;

2
driver/tcpm/anx74xx.h
View File

@@ -69,6 +69,8 @@
#define ANX74XX_REG_AUX_SWAP_SET_CC1 0x30
#define ANX74XX_REG_AUX_SWAP_SET_CC2 0xc0
#define ANX74XX_REG_ANALOG_CTRL_11 0x4c
#define ANX74XX_REG_MUX_DP_MODE_ACE_CC1 0x49
#define ANX74XX_REG_MUX_DP_MODE_ACE_CC2 0x86
#define ANX74XX_REG_MUX_DP_MODE_BDF_CC1 0x61