On 10/14/2024, Biju Das wrote: > Hi Liu Ying, Hi Biju, > >> -----Original Message----- >> From: Liu Ying <victor.liu@xxxxxxx> >> 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@xxxxxxx> >>>> --- >>>> 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]? Yes, just need to get the remote LVDS source ports first. I just proposed a snippet in a separate reply to use this function. Let's see if Dmitry likes it or not. > > [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 > -- Regards, Liu Ying
