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Message-ID:
<TY3PR01MB11346C710A5E7621314C5DADC86442@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Mon, 14 Oct 2024 08:14:00 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Liu Ying <victor.liu@....com>, Dmitry Baryshkov
<dmitry.baryshkov@...aro.org>
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Subject: RE: [PATCH v2 6/9] drm/bridge: Add ITE IT6263 LVDS to HDMI converter
Hi Liu Ying,
> -----Original Message-----
> From: Liu Ying <victor.liu@....com>
> Sent: Monday, October 14, 2024 8:18 AM
> Subject: Re: [PATCH v2 6/9] drm/bridge: Add ITE IT6263 LVDS to HDMI converter
>
> On 10/14/2024, Dmitry Baryshkov wrote:
> > On Sat, Oct 12, 2024 at 03:35:40PM +0800, Liu Ying wrote:
> >> Add basic HDMI video output support. Currently, only RGB888 output
> >> pixel format is supported. At the LVDS input side, the driver
> >> supports single LVDS link and dual LVDS links with "jeida-24" LVDS
> >> mapping.
> >>
> >> Product link:
> >> https://www.ite.com.tw/en/product/cate1/IT6263
> >>
> >> Signed-off-by: Liu Ying <victor.liu@....com>
> >> ---
> >> v2:
> >> * Add AVI inforframe support. (Maxime)
> >> * Add DRM_MODE_CONNECTOR_HDMIA. (Biju)
> >> * Rename it6263_reset() to it6263_hw_reset(). (Biju)
> >> * Check number of LVDS link data lanes. (Biju)
> >>
> >> drivers/gpu/drm/bridge/Kconfig | 8 +
> >> drivers/gpu/drm/bridge/Makefile | 1 +
> >> drivers/gpu/drm/bridge/ite-it6263.c | 919
> >> ++++++++++++++++++++++++++++
> >> 3 files changed, 928 insertions(+)
> >> create mode 100644 drivers/gpu/drm/bridge/ite-it6263.c
> >>
> >
> > [...]
> >
> >> +static int it6263_parse_dt(struct it6263 *it) {
> >> + struct device *dev = it->dev;
> >> + struct device_node *port0, *port1;
> >> + int ret;
> >> +
> >> + ret = of_property_read_u8(dev->of_node, "ite,lvds-link-num-data-lanes",
> >> + &it->lvds_link_num_dlanes);
> >> + if (ret) {
> >> + dev_err(dev, "failed to get LVDS link number of data lanes: %d\n",
> >> + ret);
> >> + return ret;
> >> + }
> >> +
> >> + it->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 2, 0);
> >> + if (IS_ERR(it->next_bridge))
> >> + return dev_err_probe(dev, PTR_ERR(it->next_bridge),
> >> + "failed to get next bridge\n");
> >> +
> >> + port0 = of_graph_get_port_by_id(dev->of_node, 0);
> >> + port1 = of_graph_get_port_by_id(dev->of_node, 1);
> >> + if (port0 && port1) {
> >> + if (of_property_read_bool(port0, "dual-lvds-even-pixels") &&
> >> + of_property_read_bool(port1, "dual-lvds-odd-pixels")) {
> >> + it->lvds_dual_link = true;
> >> + it->lvds_link12_swap = true;
> >> + } else if (of_property_read_bool(port0, "dual-lvds-odd-pixels") &&
> >> + of_property_read_bool(port1, "dual-lvds-even-pixels")) {
> >> + it->lvds_dual_link = true;
> >> + }
> >> +
> >> + if (!it->lvds_dual_link) {
> >> + dev_err(dev,
> >> + "failed to get LVDS dual link pixel order\n");
> >> + ret = -EINVAL;
> >> + }
> >
> > Please use drm_of_lvds_get_dual_link_pixel_order(), it validates that
> > the DT definition is sound: one port for odd pixels, one port for even
> > pixels.
>
> It cannot be used, because it get the pixel order for the LVDS source not sink. IT6263 is the LVDS
> sink.
>
> * drm_of_lvds_get_dual_link_pixel_order - Get LVDS dual-link pixel order
> * @port1: First DT port node of the Dual-link LVDS source
> * @port2: Second DT port node of the Dual-link LVDS source
Can't you use drm_of_lvds_get_dual_link_pixel_order() from host for the same use case. See [1]?
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/drm/renesas/rcar-du/rcar_lvds.c?h=next-20241011
lvds_bridge0: lvds-to-hdmi-bridge@4c {
compatible = "ite,it6263";
reg = <0x4c>;
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
dual-lvds-odd-pixels;
lvds0_in0: endpoint@0 {
remote-endpoint = <&lvds0_out>;
};
};
port@1 {
reg = <1>;
dual-lvds-even-pixels;
lvds0_in1: endpoint@1 {
remote-endpoint = <&lvds1_out>;
};
};
port@2 {
reg = <2>;
it6263_out: endpoint@2 {
remote-endpoint = <&lvds_to_hdmi_con_out>;
};
};
};
};
};
Cheers,
Biju
>
> >
> >> + } else if (port1) {
> >> + ret = -EINVAL;
> >> + dev_err(dev, "single input LVDS port1 is not supported\n");
> >> + } else if (!port0) {
> >> + ret = -EINVAL;
> >> + dev_err(dev, "no input LVDS port\n");
> >> + }
> >> +
> >> + of_node_put(port0);
> >> + of_node_put(port1);
> >> +
> >> + return ret;
> >> +}
> >> +
> >
>
> --
> Regards,
> Liu Ying
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