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SubjectRe: [PATCH v4 04/11] drm/bridge: synopsys: dw-hdmi: add bus format negociation
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On 07/02/2020 12:02, Boris Brezillon wrote:
> On Thu, 6 Feb 2020 20:18:27 +0100
> Neil Armstrong <narmstrong@baylibre.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@baylibre.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.

You're right...

>
>> +
>> +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@collabora.com>


Thanks, will fixup in a v5 or while applying.

Neil

>
>> #ifdef CONFIG_OF
>> hdmi->bridge.of_node = pdev->dev.of_node;
>> #endif
>

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