On Wed, Jan 18, 2023 at 10:20:48AM +0200, Dmitry Baryshkov wrote: > While we are testing the DB845c working in dual DSI mode (which is > required for the 4k support), create a separate device tree using this > configuration. > I don't think it's right to change the DTB on your device depending on your TV's ability to do 4k or not... I ran into this problem when playing around with 4k-support on the RB3 as well a while back. I was not able to figure out a way to run the lt9611 off two inputs for the lower resolutions and ended never posted anything because I couldn't come up with any good solution. Would it be possible somehow to describe the two ports in DT, but have the display driver use one or both depending on the number of inputs needed by the lt9611? Regards, Bjorn > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> > --- > > Dependencies to be able to verify the 4k@30 mode: > [1] https://lore.kernel.org/linux-arm-msm/20221229191856.3508092-1-dmitry.baryshkov@xxxxxxxxxx/ > [2] https://lore.kernel.org/dri-devel/20230118081658.2198520-1-dmitry.baryshkov@xxxxxxxxxx/ > > --- > arch/arm64/boot/dts/qcom/Makefile | 1 + > .../boot/dts/qcom/sdm845-db845c-dual-dsi.dts | 48 +++++++++++++++++++ > 2 files changed, 49 insertions(+) > create mode 100644 arch/arm64/boot/dts/qcom/sdm845-db845c-dual-dsi.dts > > diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile > index 3e79496292e7..dc55c3b989a4 100644 > --- a/arch/arm64/boot/dts/qcom/Makefile > +++ b/arch/arm64/boot/dts/qcom/Makefile > @@ -139,6 +139,7 @@ dtb-$(CONFIG_ARCH_QCOM) += sdm845-cheza-r1.dtb > dtb-$(CONFIG_ARCH_QCOM) += sdm845-cheza-r2.dtb > dtb-$(CONFIG_ARCH_QCOM) += sdm845-cheza-r3.dtb > dtb-$(CONFIG_ARCH_QCOM) += sdm845-db845c.dtb > +dtb-$(CONFIG_ARCH_QCOM) += sdm845-db845c-dual-dsi.dtb > dtb-$(CONFIG_ARCH_QCOM) += sdm845-db845c-navigation-mezzanine.dtb > dtb-$(CONFIG_ARCH_QCOM) += sdm845-lg-judyln.dtb > dtb-$(CONFIG_ARCH_QCOM) += sdm845-lg-judyp.dtb > diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c-dual-dsi.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c-dual-dsi.dts > new file mode 100644 > index 000000000000..4a366dedc841 > --- /dev/null > +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c-dual-dsi.dts > @@ -0,0 +1,48 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2023, Linaro Ltd. > + */ > + > +#include "sdm845-db845c.dts" > + > +&dsi0 { > + qcom,dual-dsi-mode; > + qcom,master-dsi; > +}; > + > +&dsi1 { > + vdda-supply = <&vreg_l26a_1p2>; > + > + qcom,dual-dsi-mode; > + > + /* DSI1 is slave, so use DSI0 clocks */ > + assigned-clock-parents = <&dsi0_phy 0>, <&dsi0_phy 1>; > + > + status = "okay"; > + > + ports { > + port@1 { > + endpoint { > + remote-endpoint = <<9611_b>; > + data-lanes = <0 1 2 3>; > + }; > + }; > + }; > +}; > + > +&dsi1_phy { > + vdds-supply = <&vreg_l1a_0p875>; > + status = "okay"; > +}; > + > +<9611_codec { > + ports { > + port@1 { > + reg = <1>; > + > + lt9611_b: endpoint { > + remote-endpoint = <&dsi1_out>; > + }; > + }; > + }; > +}; > -- > 2.39.0 >
