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Date: Fri, 7 Feb 2020 12:02:25 +0100
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Neil Armstrong <narmstrong@...libre.com>
Cc: a.hajda@...sung.com, Laurent.pinchart@...asonboard.com,
jonas@...boo.se, jernej.skrabec@...l.net,
linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 04/11] drm/bridge: synopsys: dw-hdmi: add bus format
negociation
On Thu, 6 Feb 2020 20:18:27 +0100
Neil Armstrong <narmstrong@...libre.com> wrote:
> Add the atomic_get_output_bus_fmts, atomic_get_input_bus_fmts to negociate
^ hooks?
> the possible output and input formats for the current mode and monitor,
> and use the negotiated formats in a basic atomic_check callback.
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
> +
> +/* Can return a maximum of 4 possible input formats for an output format */
> +#define MAX_INPUT_SEL_FORMATS 4
It seems to only be 3 in practice (based on the code) unless I missed
something.
> +
> +static u32 *dw_hdmi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state,
> + u32 output_fmt,
> + unsigned int *num_input_fmts)
> +{
> + u32 *input_fmts;
> + int i = 0;
> +
> + *num_input_fmts = 0;
> +
> + input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
> + GFP_KERNEL);
> + if (!input_fmts)
> + return NULL;
> +
> + switch (output_fmt) {
> + /* 8bit */
> + case MEDIA_BUS_FMT_RGB888_1X24:
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY8_1X16;
> + break;
> + case MEDIA_BUS_FMT_YUV8_1X24:
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY8_1X16;
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
> + break;
> + case MEDIA_BUS_FMT_UYVY8_1X16:
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY8_1X16;
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
> + break;
> +
> + /* 10bit */
> + case MEDIA_BUS_FMT_RGB101010_1X30:
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB101010_1X30;
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV10_1X30;
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY10_1X20;
> + break;
> + case MEDIA_BUS_FMT_YUV10_1X30:
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV10_1X30;
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY10_1X20;
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB101010_1X30;
> + break;
> + case MEDIA_BUS_FMT_UYVY10_1X20:
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY10_1X20;
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV10_1X30;
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB101010_1X30;
> + break;
> +
> + /* 12bit */
> + case MEDIA_BUS_FMT_RGB121212_1X36:
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB121212_1X36;
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV12_1X36;
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY12_1X24;
> + break;
> + case MEDIA_BUS_FMT_YUV12_1X36:
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV12_1X36;
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY12_1X24;
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB121212_1X36;
> + break;
> + case MEDIA_BUS_FMT_UYVY12_1X24:
> + input_fmts[i++] = MEDIA_BUS_FMT_UYVY12_1X24;
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV12_1X36;
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB121212_1X36;
> + break;
> +
> + /* 16bit */
> + case MEDIA_BUS_FMT_RGB161616_1X48:
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB161616_1X48;
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV16_1X48;
> + break;
> + case MEDIA_BUS_FMT_YUV16_1X48:
> + input_fmts[i++] = MEDIA_BUS_FMT_YUV16_1X48;
> + input_fmts[i++] = MEDIA_BUS_FMT_RGB161616_1X48;
> + break;
> +
> + /* 420 */
> + case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
> + case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
> + case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
> + case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
> + input_fmts[i++] = output_fmt;
> + break;
> + }
> +
> + *num_input_fmts = i;
> +
> + if (*num_input_fmts == 0) {
> + kfree(input_fmts);
> + input_fmts = NULL;
> + }
> +
> + return input_fmts;
> +}
> +
> +static int dw_hdmi_bridge_atomic_check(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> +{
> + struct dw_hdmi *hdmi = bridge->driver_private;
> +
> + dev_dbg(hdmi->dev, "selected output format %x\n",
> + bridge_state->output_bus_cfg.format);
Nit: not aligned on the open parens.
> +
> + hdmi->hdmi_data.enc_out_bus_format =
> + bridge_state->output_bus_cfg.format;
> +
> + dev_dbg(hdmi->dev, "selected input format %x\n",
> + bridge_state->input_bus_cfg.format);
> +
> + hdmi->hdmi_data.enc_in_bus_format =
> + bridge_state->input_bus_cfg.format;
> +
> + return 0;
> +}
> +
> static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
> {
> struct dw_hdmi *hdmi = bridge->driver_private;
> @@ -2499,6 +2759,9 @@ static const struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
> .atomic_reset = drm_atomic_helper_bridge_reset,
> .attach = dw_hdmi_bridge_attach,
> .detach = dw_hdmi_bridge_detach,
> + .atomic_check = dw_hdmi_bridge_atomic_check,
> + .atomic_get_output_bus_fmts = dw_hdmi_bridge_atomic_get_output_bus_fmts,
> + .atomic_get_input_bus_fmts = dw_hdmi_bridge_atomic_get_input_bus_fmts,
> .enable = dw_hdmi_bridge_enable,
> .disable = dw_hdmi_bridge_disable,
> .mode_set = dw_hdmi_bridge_mode_set,
> @@ -2963,6 +3226,7 @@ __dw_hdmi_probe(struct platform_device *pdev,
>
> hdmi->bridge.driver_private = hdmi;
> hdmi->bridge.funcs = &dw_hdmi_bridge_funcs;
> +
Nit: not sure this has to be part of that patch.
Looks good otherwise.
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> #ifdef CONFIG_OF
> hdmi->bridge.of_node = pdev->dev.of_node;
> #endif
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