Re: [PATCH v4 04/11] drm/bridge: synopsys: dw-hdmi: add bus format negociation

From: Neil Armstrong
Date: Mon Mar 02 2020 - 10:58:04 EST

Next message: Andy Shevchenko: "Re: [PATCH v1] mei: Don't encourage to use kernel internal types in user code"
Previous message: Geert Uytterhoeven: "Re: [PATCH] arm64: dts: renesas: r8a774c0-cat874: Add support for AISTARVISION MIPI Adapter V2.1"
In reply to: Laurent Pinchart: "Re: [PATCH v4 04/11] drm/bridge: synopsys: dw-hdmi: add bus format negociation"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On 02/03/2020 11:18, Laurent Pinchart wrote:
> Hi Neil,
>
> Thank you for the patch.
>
> On Thu, Feb 06, 2020 at 08:18:27PM +0100, Neil Armstrong wrote:
>> Add the atomic_get_output_bus_fmts, atomic_get_input_bus_fmts to negociate
>> 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@xxxxxxxxxxxx>
>> ---
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 272 +++++++++++++++++++++-
>> 1 file changed, 268 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> index fec4a4bcd1fe..15048ad694bc 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> @@ -2095,11 +2095,10 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>> hdmi->hdmi_data.video_mode.mpixelrepetitionoutput = 0;
>> hdmi->hdmi_data.video_mode.mpixelrepetitioninput = 0;
>>
>> - /* TOFIX: Get input format from plat data or fallback to RGB888 */
>> if (hdmi->plat_data->input_bus_format)
>> hdmi->hdmi_data.enc_in_bus_format =
>> hdmi->plat_data->input_bus_format;
>> - else
>> + else if (hdmi->hdmi_data.enc_in_bus_format == MEDIA_BUS_FMT_FIXED)
>> hdmi->hdmi_data.enc_in_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
>>
>> /* TOFIX: Get input encoding from plat data or fallback to none */
>> @@ -2109,8 +2108,8 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>> else
>> hdmi->hdmi_data.enc_in_encoding = V4L2_YCBCR_ENC_DEFAULT;
>>
>> - /* TOFIX: Default to RGB888 output format */
>> - hdmi->hdmi_data.enc_out_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
>> + if (hdmi->hdmi_data.enc_out_bus_format == MEDIA_BUS_FMT_FIXED)
>> + hdmi->hdmi_data.enc_out_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
>>
>> hdmi->hdmi_data.pix_repet_factor = 0;
>> hdmi->hdmi_data.hdcp_enable = 0;
>> @@ -2388,6 +2387,267 @@ static const struct drm_connector_helper_funcs dw_hdmi_connector_helper_funcs =
>> .atomic_check = dw_hdmi_connector_atomic_check,
>> };
>>
>> +/*
>> + * Possible output formats :
>> + * - MEDIA_BUS_FMT_UYYVYY16_0_5X48,
>> + * - MEDIA_BUS_FMT_UYYVYY12_0_5X36,
>> + * - MEDIA_BUS_FMT_UYYVYY10_0_5X30,
>> + * - MEDIA_BUS_FMT_UYYVYY8_0_5X24,
>> + * - MEDIA_BUS_FMT_YUV16_1X48,
>> + * - MEDIA_BUS_FMT_RGB161616_1X48,
>> + * - MEDIA_BUS_FMT_UYVY12_1X24,
>> + * - MEDIA_BUS_FMT_YUV12_1X36,
>> + * - MEDIA_BUS_FMT_RGB121212_1X36,
>> + * - MEDIA_BUS_FMT_UYVY10_1X20,
>> + * - MEDIA_BUS_FMT_YUV10_1X30,
>> + * - MEDIA_BUS_FMT_RGB101010_1X30,
>> + * - MEDIA_BUS_FMT_UYVY8_1X16,
>> + * - MEDIA_BUS_FMT_YUV8_1X24,
>> + * - MEDIA_BUS_FMT_RGB888_1X24,
>> + */
>
> I'd drop this comment as I don't think it brings much, except for a risk
> of getting out of sync with the implementation below :-)

I know it's redundant, but I'll prefer having it here to clarify which bus formats
are handled.

>
>> +
>> +/* Can return a maximum of 12 possible output formats for a mode/connector */
>> +#define MAX_OUTPUT_SEL_FORMATS 12
>
> I count 11 below.

Exact !

>
>> +
>> +static u32 *dw_hdmi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
>> + struct drm_bridge_state *bridge_state,
>> + struct drm_crtc_state *crtc_state,
>> + struct drm_connector_state *conn_state,
>> + unsigned int *num_output_fmts)
>> +{
>> + struct drm_connector *conn = conn_state->connector;
>> + struct drm_display_info *info = &conn->display_info;
>> + struct drm_display_mode *mode = &crtc_state->mode;
>> + u8 max_bpc = conn_state->max_requested_bpc;
>> + bool is_hdmi2_sink = info->hdmi.scdc.supported ||
>> + (info->color_formats & DRM_COLOR_FORMAT_YCRCB420);
>> + u32 *output_fmts;
>> + int i = 0;
>
> i is never negative, you can make it an unsigned int.
ok

>
>> +
>> + *num_output_fmts = 0;
>> +
>> + output_fmts = kcalloc(MAX_OUTPUT_SEL_FORMATS, sizeof(*output_fmts),
>> + GFP_KERNEL);
>> + if (!output_fmts)
>> + return NULL;
>> +
>> + /*
>> + * If the current mode enforces 4:2:0, force the output but format
>> + * to 4:2:0 and do not add the YUV422/444/RGB formats
>> + */
>> + if (conn->ycbcr_420_allowed &&
>> + (drm_mode_is_420_only(info, mode) ||
>> + (is_hdmi2_sink && drm_mode_is_420_also(info, mode)))) {
>> +
>> + /* Order bus formats from 16bit to 8bit if supported */
>> + if (max_bpc >= 16 && info->bpc == 16 &&
>> + (info->hdmi.y420_dc_modes & DRM_EDID_YCBCR420_DC_48))
>> + output_fmts[i++] = MEDIA_BUS_FMT_UYYVYY16_0_5X48;
>> +
>> + if (max_bpc >= 12 && info->bpc >= 12 &&
>> + (info->hdmi.y420_dc_modes & DRM_EDID_YCBCR420_DC_36))
>> + output_fmts[i++] = MEDIA_BUS_FMT_UYYVYY12_0_5X36;
>> +
>> + if (max_bpc >= 10 && info->bpc >= 10 &&
>> + (info->hdmi.y420_dc_modes & DRM_EDID_YCBCR420_DC_30))
>> + output_fmts[i++] = MEDIA_BUS_FMT_UYYVYY10_0_5X30;
>> +
>> + /* Default 8bit fallback */
>> + output_fmts[i++] = MEDIA_BUS_FMT_UYYVYY8_0_5X24;
>> +
>> + *num_output_fmts = i;
>> +
>> + return output_fmts;
>> + }
>> +
>> + /*
>> + * Order bus formats from 16bit to 8bit and from YUV422 to RGB
>> + * if supported. In any case the default RGB888 format is added
>> + */
>> +
>> + if (max_bpc >= 16 && info->bpc == 16) {
>> + if (info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
>> + output_fmts[i++] = MEDIA_BUS_FMT_YUV16_1X48;
>> +
>> + output_fmts[i++] = MEDIA_BUS_FMT_RGB161616_1X48;
>> + }
>> +
>> + if (max_bpc >= 12 && info->bpc >= 12) {
>> + if (info->color_formats & DRM_COLOR_FORMAT_YCRCB422)
>> + output_fmts[i++] = MEDIA_BUS_FMT_UYVY12_1X24;
>> +
>> + if (info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
>> + output_fmts[i++] = MEDIA_BUS_FMT_YUV12_1X36;
>> +
>> + output_fmts[i++] = MEDIA_BUS_FMT_RGB121212_1X36;
>> + }
>> +
>> + if (max_bpc >= 10 && info->bpc >= 10) {
>> + if (info->color_formats & DRM_COLOR_FORMAT_YCRCB422)
>> + output_fmts[i++] = MEDIA_BUS_FMT_UYVY10_1X20;
>> +
>> + if (info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
>> + output_fmts[i++] = MEDIA_BUS_FMT_YUV10_1X30;
>> +
>> + output_fmts[i++] = MEDIA_BUS_FMT_RGB101010_1X30;
>> + }
>> +
>> + if (info->color_formats & DRM_COLOR_FORMAT_YCRCB422)
>> + output_fmts[i++] = MEDIA_BUS_FMT_UYVY8_1X16;
>> +
>> + if (info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
>> + output_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
>> +
>> + /* Default 8bit RGB fallback */
>> + output_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
>> +
>> + *num_output_fmts = i;
>> +
>> + return output_fmts;
>> +}
>> +
>> +/*
>> + * Possible input formats :
>> + * - MEDIA_BUS_FMT_RGB888_1X24
>> + * - MEDIA_BUS_FMT_YUV8_1X24
>> + * - MEDIA_BUS_FMT_UYVY8_1X16
>> + * - MEDIA_BUS_FMT_UYYVYY8_0_5X24
>> + * - MEDIA_BUS_FMT_RGB101010_1X30
>> + * - MEDIA_BUS_FMT_YUV10_1X30
>> + * - MEDIA_BUS_FMT_UYVY10_1X20
>> + * - MEDIA_BUS_FMT_UYYVYY10_0_5X30
>> + * - MEDIA_BUS_FMT_RGB121212_1X36
>> + * - MEDIA_BUS_FMT_YUV12_1X36
>> + * - MEDIA_BUS_FMT_UYVY12_1X24
>> + * - MEDIA_BUS_FMT_UYYVYY12_0_5X36
>> + * - MEDIA_BUS_FMT_RGB161616_1X48
>> + * - MEDIA_BUS_FMT_YUV16_1X48
>> + * - MEDIA_BUS_FMT_UYYVYY16_0_5X48
>> + */
>
> Same here.

I'll prefer keeping these aswell

>
>> +
>> +/* Can return a maximum of 4 possible input formats for an output format */
>> +#define MAX_INPUT_SEL_FORMATS 4
>
> As Boris pointed out, that should be 3.

Yep

>
>> +
>> +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;
>
> i is never negative, you can make it an unsigned int.
ok

>
>> +
>> + *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 */
>
> s/420/YUV 4:2:0/ ?

Looks better

>
>> + 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",
>
> s/%x/0x%04x/
>
>> + bridge_state->output_bus_cfg.format);
>
> Misalignment ?

Fixed

>
>> +
>> + 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);
>
> Same here. I would combine both messages:
>
> dev_dbg(hdmi->dev, "input format: 0x%04x, output format: 0x04x\n",
> bridge_state->input_bus_cfg.format,
> bridge_state->output_bus_cfg.format);

Looks better

>
>> +
>> + 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;
>> +
>
> This seems unrelated.

Yep

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

Thanks,
Neil

Next message: Andy Shevchenko: "Re: [PATCH v1] mei: Don't encourage to use kernel internal types in user code"
Previous message: Geert Uytterhoeven: "Re: [PATCH] arm64: dts: renesas: r8a774c0-cat874: Add support for AISTARVISION MIPI Adapter V2.1"
In reply to: Laurent Pinchart: "Re: [PATCH v4 04/11] drm/bridge: synopsys: dw-hdmi: add bus format negociation"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]