diff options
| author | xuxinxiong <xuxinxiong@huaqin.corp-partner.google.com> | 2021-11-06 16:11:30 +0800 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-11-09 18:42:33 +0000 |
| commit | ba2b1139f1c3479bf7886bb3382216b1e76ad881 (patch) | |
| tree | 0680086c0bcce7f5c158fc45250e719b57435180 /src/mainboard | |
| parent | a003c33aa1ca31747314d721dee8a1a8552def4b (diff) | |
google/trogdor: Update the power on sequence of ps8640
For the Qualcomm PBL configuration of GPIO, we need to initial the
GPIOs for VDD33# and RST# at the beginning of coreboot. According to
the pa8640 latest spec v1.4, update the sequence of VDD33# and PD#.
BUG=b:204637643
BRANCH=trogdor
TEST=verified the waveform of ps8640 at coreboot phase.
Signed-off-by: xuxinxiong <xuxinxiong@huaqin.corp-partner.google.com>
Change-Id: Ia378aafa49ec462c990501ce48721e330d9648b0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58994
Reviewed-by: Wentao Qin <qinwentao@huaqin.corp-partner.google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/trogdor/chromeos.c | 2 | ||||
| -rw-r--r-- | src/mainboard/google/trogdor/mainboard.c | 12 |
2 files changed, 11 insertions, 3 deletions
diff --git a/src/mainboard/google/trogdor/chromeos.c b/src/mainboard/google/trogdor/chromeos.c index 9006000191..90de1e4ce0 100644 --- a/src/mainboard/google/trogdor/chromeos.c +++ b/src/mainboard/google/trogdor/chromeos.c @@ -22,6 +22,8 @@ void setup_chromeos_gpios(void) } else { gpio_output(GPIO_EN_PP3300_DX_EDP, 0); gpio_output(GPIO_EDP_BRIDGE_ENABLE, 0); + gpio_output(GPIO_PS8640_EDP_BRIDGE_3V3_ENABLE, 0); + gpio_output(GPIO_PS8640_EDP_BRIDGE_RST_L, 0); } if (CONFIG(TROGDOR_HAS_FINGERPRINT)) { diff --git a/src/mainboard/google/trogdor/mainboard.c b/src/mainboard/google/trogdor/mainboard.c index 1a6013198b..5499a07121 100644 --- a/src/mainboard/google/trogdor/mainboard.c +++ b/src/mainboard/google/trogdor/mainboard.c @@ -106,12 +106,18 @@ static void power_on_ps8640_bridge(void) gpio_output(GPIO_EN_PP3300_DX_EDP, 1); gpio_output(GPIO_PS8640_EDP_BRIDGE_3V3_ENABLE, 1); + + /* + * According to ps8640 v1.4 spec, and the raise time of vdd33 is a bit + * long, so wait for 4ms after VDD33 goes high and then deassert PD. + */ + mdelay(4); + gpio_output(GPIO_PS8640_EDP_BRIDGE_PD_L, 1); - gpio_output(GPIO_PS8640_EDP_BRIDGE_RST_L, 0); /* - * According to ps8640 app note v0.6, wait for 2ms ("t1") after - * VDD33 goes high and then deassert RST. + * According to ps8640 app note v0.6, wait for 2ms after VDD33 goes + * high and then deassert RST. */ mdelay(2); |