Hi AngeloGioacchino
According to video-interfaces.yaml, property data-lanes should in the endpoint. It6505 has dpi input and no data-lanes parameters. It6505 has dp output and has data-lanes parameters. We want to use data-lanes in the output, but output point use extcon instead of endpoint. Do not have output endpoint.
Which line in dts should data-lanes be in?
Below is it6505 dts
Thanks for your suggestion!
dp-bridge@5c {
compatible = "ite,it6505";
interrupts = <152 IRQ_TYPE_EDGE_FALLING 152 0>;
reg = <0x5c>;
pinctrl-names = "default";
pinctrl-0 = <&it6505_pins>;
ovdd-supply = <&mt6358_vsim1_reg>;
pwr18-supply = <&it6505_pp18_reg>;
reset-gpios = <&pio 179 1>;
extcon = <&usbc_extcon>;
port {
it6505_in: endpoint {
remote-endpoint = <&dpi_out>;
};
};
};
-----Original Message-----
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Sent: Monday, June 27, 2022 8:55 PM
To: Allen Chen (陳柏宇) <allen.chen@xxxxxxxxxx>
Cc: Pin-yen Lin <treapking@xxxxxxxxxx>; Jau-Chih Tseng (曾昭智) <Jau-Chih.Tseng@xxxxxxxxxx>; Hermes Wu (吳佳宏) <Hermes.Wu@xxxxxxxxxx>; Kenneth Hung (洪家倫) <Kenneth.Hung@xxxxxxxxxx>; Allen-kh Cheng <allen-kh.cheng@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>; Pin-yen Lin <treapking@xxxxxxxxxxxx>; Andrzej Hajda <andrzej.hajda@xxxxxxxxx>; Neil Armstrong <narmstrong@xxxxxxxxxxxx>; Robert Foss <robert.foss@xxxxxxxxxx>; Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>; Jonas Karlman <jonas@xxxxxxxxx>; Jernej Skrabec <jernej.skrabec@xxxxxxxxx>; David Airlie <airlied@xxxxxxxx>; Daniel Vetter <daniel@xxxxxxxx>; Matthias Brugger <matthias.bgg@xxxxxxxxx>; open list:DRM DRIVERS <dri-devel@xxxxxxxxxxxxxxxxxxxxx>; open list <linux-kernel@xxxxxxxxxxxxxxx>; moderated list:ARM/Mediatek SoC support <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>; moderated list:ARM/Mediatek SoC support <linux-mediatek@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH] drm/bridge: add it6505 driver read config from dt property
Il 23/06/22 11:31, allen ha scritto:
> From: allen chen <allen.chen@xxxxxxxxxx>
>
> add read max-lane and max-pixel-clock from dt property
>
> Signed-off-by: Allen-kh Cheng
> <allen-kh.cheng@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Pin-yen Lin <treapking@xxxxxxxxxxxx>
Hello Allen,
as Sam also pointed out, please fix your S-o-b email: it has to match with the author one.
Anyway, you're adding devicetree properties, so this implies that you should also change the dt-bindings documentation for this driver... and also, I have some more comments, check below:
> ---
> drivers/gpu/drm/bridge/ite-it6505.c | 35 ++++++++++++++++++++++++++---
> 1 file changed, 32 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c
> b/drivers/gpu/drm/bridge/ite-it6505.c
> index 4b673c4792d77..c9121d4635a52 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -436,6 +436,8 @@ struct it6505 {
> bool powered;
> bool hpd_state;
> u32 afe_setting;
> + u32 max_dpi_pixel_clock;
> + u32 max_lane_count;
> enum hdcp_state hdcp_status;
> struct delayed_work hdcp_work;
> struct work_struct hdcp_wait_ksv_list; @@ -1466,7 +1468,8 @@ static
> void it6505_parse_link_capabilities(struct it6505 *it6505)
> it6505->lane_count = link->num_lanes;
> DRM_DEV_DEBUG_DRIVER(dev, "Sink support %d lanes training",
> it6505->lane_count);
> - it6505->lane_count = min_t(int, it6505->lane_count, MAX_LANE_COUNT);
> + it6505->lane_count = min_t(int, it6505->lane_count,
> + it6505->max_lane_count);
>
> it6505->branch_device = drm_dp_is_branch(it6505->dpcd);
> DRM_DEV_DEBUG_DRIVER(dev, "Sink %sbranch device", @@ -2895,7
> +2898,7 @@ it6505_bridge_mode_valid(struct drm_bridge *bridge,
> if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> return MODE_NO_INTERLACE;
>
> - if (mode->clock > DPI_PIXEL_CLK_MAX)
> + if (mode->clock > it6505->max_dpi_pixel_clock)
> return MODE_CLOCK_HIGH;
>
> it6505->video_info.clock = mode->clock; @@ -3057,6 +3060,8 @@
> static void it6505_parse_dt(struct it6505 *it6505)
> {
> struct device *dev = &it6505->client->dev;
> u32 *afe_setting = &it6505->afe_setting;
> + u32 *max_lane_count = &it6505->max_lane_count;
> + u32 *max_dpi_pixel_clock = &it6505->max_dpi_pixel_clock;
>
> it6505->lane_swap_disabled =
> device_property_read_bool(dev, "no-laneswap"); @@ -3072,7 +3077,31
> @@ static void it6505_parse_dt(struct it6505 *it6505)
> } else {
> *afe_setting = 0;
> }
> - DRM_DEV_DEBUG_DRIVER(dev, "using afe_setting: %d", *afe_setting);
> +
> + if (device_property_read_u32(dev, "max-lane-count",
Please use the standard property "data-lanes" from video-interfaces.yaml.
> + max_lane_count) == 0) {
> + if (*max_lane_count > 4 || *max_lane_count == 3) {
> + dev_err(dev, "max lane count error, use default");
> + *max_lane_count = MAX_LANE_COUNT;
> + }
> + } else {
> + *max_lane_count = MAX_LANE_COUNT;
> + }
> +
> + if (device_property_read_u32(dev, "max-dpi-pixel-clock",
> + max_dpi_pixel_clock) == 0) {
What about "max-pixel-clock-khz" or "max-pixel-clock-hz"?
Regards,
Angelo
