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reef/ps8751: Add force wake for PS8751.

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If PS8751 goes into low power mode during sysjump, then tcpm_init will
fail since PS8751 is not accessible via I2C, so force it to wake up
during hook_init.

BUG=chrome-os-partner:59693
BRANCH=none
TEST=Verified PS8751 port on reef is functional after sysjump.

Change-Id: I2aa5a80b2ea9c17a01e4cba04493f83cb0a39955
Signed-off-by: Kevin K Wong <kevin.k.wong@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/410132
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Kevin K Wong
2016-11-11 10:27:16 -08:00
committed by chrome-bot
parent bb3ab2fbc4
commit 3de9c1dcd0
1 changed files with 12 additions and 1 deletions
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13
board/reef/board.c
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@@ -303,12 +303,23 @@ void board_print_tcpc_fw_version(int port)
void board_tcpc_init(void)
{
int port;
int port, reg;
/* Only reset TCPC if not sysjump */
if (!system_jumped_to_this_image())
board_reset_pd_mcu();
/*
* TODO: Remove when Reef is updated with PS8751 A3.
*
* Force PS8751 A2 to wake from low power mode.
* If PS8751 remains in low power mode after sysjump,
* TCPM_INIT will fail due to not able to access PS8751.
*
* NOTE: PS8751 A3 will wake on any I2C access.
*/
i2c_read8(NPCX_I2C_PORT0_1, 0x10, 0xA0, &reg);
/* Enable TCPC0 interrupt */
gpio_enable_interrupt(GPIO_USB_C0_PD_INT_ODL);