[3/5] arm64: dts: qcom: sc7180: Start the trogdor eDP/touchscreen regulator on
Commit Message
Now that we've added the `off-on-delay-us` for the touchpanel
regulator, we can see that we're actually hitting that delay at
bootup. I saw about 200 ms of delay.
Let's avoid that delay by starting the regulator on. We'll only do
this for eDP devices for the time being.
NOTE: we _won't_ do this for homestar. Homestar's panel really likes
to be power cycled. It's why the Linux driver for this panel has a
pm_runtime_put_sync_suspend() when the panel is being unprepared but
the normal panel-edp driver doesn't. It's also why this hardware has a
separate power rail for eDP vs. touchscreen, unlike all the other
trogdor boards. We won't start homestar's regulator on. While this
could mean a slight delay on homestar, it is probably a _correct_
delay. The bootloader might have left the regulator on (it does so in
dev and recovery modes), so if we turned the regulator off at probe
time and we actually hit the delay then we were probably violating T12
in the panel spec.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---
.../boot/dts/qcom/sc7180-trogdor-homestar.dtsi | 18 ++++++++++++++++++
.../dts/qcom/sc7180-trogdor-parade-ps8640.dtsi | 8 ++++++++
.../dts/qcom/sc7180-trogdor-ti-sn65dsi86.dtsi | 8 ++++++++
3 files changed, 34 insertions(+)
Comments
On Thu, Dec 08, 2022 at 11:20:04AM -0800, Douglas Anderson wrote:
> Now that we've added the `off-on-delay-us` for the touchpanel
> regulator, we can see that we're actually hitting that delay at
> bootup. I saw about 200 ms of delay.
>
> Let's avoid that delay by starting the regulator on. We'll only do
> this for eDP devices for the time being.
>
> NOTE: we _won't_ do this for homestar. Homestar's panel really likes
> to be power cycled. It's why the Linux driver for this panel has a
> pm_runtime_put_sync_suspend() when the panel is being unprepared but
> the normal panel-edp driver doesn't. It's also why this hardware has a
> separate power rail for eDP vs. touchscreen, unlike all the other
> trogdor boards. We won't start homestar's regulator on. While this
> could mean a slight delay on homestar, it is probably a _correct_
> delay. The bootloader might have left the regulator on (it does so in
> dev and recovery modes), so if we turned the regulator off at probe
> time and we actually hit the delay then we were probably violating T12
> in the panel spec.
>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
@@ -85,6 +85,24 @@ map1 {
};
};
+/*
+ * ADDITIONS TO FIXED REGULATORS DEFINED IN PARENT DEVICE TREE FILES
+ *
+ * Sort order matches the order in the parent files (parents before children).
+ */
+
+&pp3300_dx_edp {
+ /*
+ * The atna33xc20 really likes to be power cycled to keep it from
+ * getting in a bad state. This is the reason that the touchscreen
+ * rail and eDP rails are separate from each other on homestar (but
+ * not other trogdor devices) Make sure it starts "off" at bootup.
+ */
+ /delete-property/ regulator-boot-on;
+};
+
+/* ADDITIONS TO NODES DEFINED IN PARENT DEVICE TREE FILES */
+
ap_ts_pen_1v8: &i2c4 {
status = "okay";
clock-frequency = <400000>;
@@ -34,6 +34,14 @@ pp3300_brij_ps8640: pp3300-brij-ps8640-regulator {
&pp3300_dx_edp {
off-on-delay-us = <500000>;
+
+ /*
+ * It's nicer to start with this regulator enabled. The
+ * bootloader may have left it on and it's nice not to cause an
+ * extra power cycle of the touchscreen and eDP panel at bootup.
+ * This should help speed bootup because we have off-on-delay-us.
+ */
+ regulator-boot-on;
};
/* ADDITIONS TO NODES DEFINED IN PARENT DEVICE TREE FILES */
@@ -15,6 +15,14 @@
&pp3300_dx_edp {
off-on-delay-us = <500000>;
+
+ /*
+ * It's nicer to start with this regulator enabled. The
+ * bootloader may have left it on and it's nice not to cause an
+ * extra power cycle of the touchscreen and eDP panel at bootup.
+ * This should help speed bootup because we have off-on-delay-us.
+ */
+ regulator-boot-on;
};
/* ADDITIONS TO NODES DEFINED IN PARENT DEVICE TREE FILES */