| Message ID | 20250327-wip-obbardc-qcom-t14s-oled-panel-v3-1-45d5f2747398@linaro.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for OLED panel used on Snapdragon Lenovo T14s Gen6 | expand |
On Thu, Mar 27, 2025 at 04:56:53PM +0000, Christopher Obbard wrote: > The eDP panel has an HPD GPIO. Describe it in the device tree > for the generic T14s model, as the HPD GPIO property is used in > both the OLED and LCD models which inherit this device tree. > > Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> > Signed-off-by: Christopher Obbard <christopher.obbard@linaro.org> > --- > arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
On Thu, Mar 27, 2025 at 04:56:53PM +0000, Christopher Obbard wrote: > The eDP panel has an HPD GPIO. Describe it in the device tree > for the generic T14s model, as the HPD GPIO property is used in > both the OLED and LCD models which inherit this device tree. AFAICT, this patch is not correct as the hotplug detect signal is connected directly to the display controller on (these) Qualcomm SoCs and is already handled by its driver. Describing it as you do here leads to less accurate delays, see commits: 2327b13d6c47 ("drm/panel-edp: Take advantage of wait_hpd_asserted() in struct drm_dp_aux"). 3b5765df375c ("drm/panel: atna33xc20: Take advantage of wait_hpd_asserted() in struct drm_dp_aux") Perhaps you lose some other functionality too. > Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> > Signed-off-by: Christopher Obbard <christopher.obbard@linaro.org> > --- > arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi > index 962fb050c55c4fd33f480a21a8c47a484d0c82b8..46c73f5c039ed982b553636cf8c4237a20ba7687 100644 > --- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi > +++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi > @@ -980,8 +980,12 @@ &mdss_dp3 { > aux-bus { > panel: panel { > compatible = "edp-panel"; > + hpd-gpios = <&tlmm 119 GPIO_ACTIVE_HIGH>; > power-supply = <&vreg_edp_3p3>; > > + pinctrl-0 = <&edp_hpd_n_default>; > + pinctrl-names = "default"; > + > port { > edp_panel_in: endpoint { > remote-endpoint = <&mdss_dp3_out>; > @@ -1286,6 +1290,13 @@ hall_int_n_default: hall-int-n-state { > bias-disable; > }; > > + edp_hpd_n_default: edp-hpd-n-state { > + pins = "gpio119"; > + function = "gpio"; > + drive-strength = <2>; > + bias-pull-up; > + }; I checked the firmware configuration for this pin on my T14s, which does not match what you have here. Instead the function is set to "edp0_hot" which forwards the signal to the display controller which already handles the signal on panel power on. (And there is also no internal pull up enabled). We may want to describe this pin configuration somewhere, but that's a separate issue. Johan
diff --git a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi index 962fb050c55c4fd33f480a21a8c47a484d0c82b8..46c73f5c039ed982b553636cf8c4237a20ba7687 100644 --- a/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi +++ b/arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi @@ -980,8 +980,12 @@ &mdss_dp3 { aux-bus { panel: panel { compatible = "edp-panel"; + hpd-gpios = <&tlmm 119 GPIO_ACTIVE_HIGH>; power-supply = <&vreg_edp_3p3>; + pinctrl-0 = <&edp_hpd_n_default>; + pinctrl-names = "default"; + port { edp_panel_in: endpoint { remote-endpoint = <&mdss_dp3_out>; @@ -1286,6 +1290,13 @@ hall_int_n_default: hall-int-n-state { bias-disable; }; + edp_hpd_n_default: edp-hpd-n-state { + pins = "gpio119"; + function = "gpio"; + drive-strength = <2>; + bias-pull-up; + }; + pcie4_default: pcie4-default-state { clkreq-n-pins { pins = "gpio147";