[v15 3/4] drm: Add colorspace info to AVI Infoframe

Shankar, Uma uma.shankar at intel.com
Tue Feb 12 21:30:50 UTC 2019



>-----Original Message-----
>From: Ville Syrjälä [mailto:ville.syrjala at linux.intel.com]
>Sent: Tuesday, February 12, 2019 10:35 PM
>To: Shankar, Uma <uma.shankar at intel.com>
>Cc: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org; Syrjala, Ville
><ville.syrjala at intel.com>; emil.l.velikov at gmail.com; Lankhorst, Maarten
><maarten.lankhorst at intel.com>
>Subject: Re: [v15 3/4] drm: Add colorspace info to AVI Infoframe
>
>On Fri, Feb 08, 2019 at 11:54:55PM +0530, Uma Shankar wrote:
>> This adds colorspace information to HDMI AVI infoframe.
>> A helper function is added to program the same.
>>
>> v2: Moved this to drm core instead of i915 driver.
>>
>> v3: Exported the helper function.
>>
>> v4: Added separate HDMI specific macro as per CTA spec.
>> This is separate from user exposed enum values. This is as per Ville's
>> suggestion.
>>
>> v5: Appended BT709 and SMPTE 170M with YCC information as per Ville's
>> review comment to be clear and not to be confused with RGB.
>>
>> Signed-off-by: Uma Shankar <uma.shankar at intel.com>
>> ---
>>  drivers/gpu/drm/drm_edid.c  | 57
>> +++++++++++++++++++++++++++++++++++++++++++++
>>  include/drm/drm_connector.h | 20 ++++++++++++++++
>>  include/drm/drm_edid.h      |  6 +++++
>>  3 files changed, 83 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
>> index 990b190..5202fea 100644
>> --- a/drivers/gpu/drm/drm_edid.c
>> +++ b/drivers/gpu/drm/drm_edid.c
>> @@ -4925,6 +4925,63 @@ static bool is_hdmi2_sink(struct drm_connector
>> *connector)  EXPORT_SYMBOL(drm_hdmi_avi_infoframe_from_display_mode);
>>
>>  /**
>> + * drm_hdmi_avi_infoframe_colorspace() - fill the HDMI AVI infoframe
>> + *                                       colorspace information
>> + * @frame: HDMI AVI infoframe
>> + * @conn_state: connector state
>> + */
>> +void
>> +drm_hdmi_avi_infoframe_colorspace(struct hdmi_avi_infoframe *frame,
>> +				  const struct drm_connector_state *conn_state) {
>> +	u32 colorimetry_val = conn_state->colorspace &
>> +				FULL_COLORIMETRY_MASK;
>> +
>> +	switch (colorimetry_val) {
>> +	case DRM_MODE_COLORIMETRY_NO_DATA:
>> +		colorimetry_val = HDMI_COLORIMETRY_NO_DATA;
>> +		break;
>> +	case HDMI_COLORIMETRY_SMPTE_170M_YCC:
>> +		colorimetry_val = HDMI_COLORIMETRY_SMPTE_170M_YCC;
>> +		break;
>> +	case DRM_MODE_COLORIMETRY_BT709_YCC:
>> +		colorimetry_val = HDMI_COLORIMETRY_BT709_YCC;
>> +		break;
>> +	case DRM_MODE_COLORIMETRY_XVYCC_601:
>> +		colorimetry_val = HDMI_COLORIMETRY_XVYCC_601;
>> +		break;
>> +	case DRM_MODE_COLORIMETRY_XVYCC_709:
>> +		colorimetry_val = HDMI_COLORIMETRY_XVYCC_709;
>> +		break;
>> +	case DRM_MODE_COLORIMETRY_SYCC_601:
>> +		colorimetry_val = HDMI_COLORIMETRY_SYCC_601;
>> +		break;
>> +	case DRM_MODE_COLORIMETRY_OPYCC_601:
>> +		colorimetry_val = HDMI_COLORIMETRY_OPYCC_601;
>> +		break;
>> +	case DRM_MODE_COLORIMETRY_OPRGB:
>> +		colorimetry_val = HDMI_COLORIMETRY_OPRGB;
>> +		break;
>> +	case DRM_MODE_COLORIMETRY_BT2020_RGB:
>> +	case DRM_MODE_COLORIMETRY_BT2020_YCC:
>> +		colorimetry_val = HDMI_COLORIMETRY_BT2020_RGB;
>> +		break;
>> +	case DRM_MODE_COLORIMETRY_BT2020_CYCC:
>> +		colorimetry_val = HDMI_COLORIMETRY_BT2020_CYCC;
>> +		break;
>> +	default:
>> +		/* ToDo: DCI-P3 will be handled as part of ACE enabling */
>> +		colorimetry_val = HDMI_COLORIMETRY_NO_DATA;
>> +		break;
>> +	}
>
>A table would probably be prettier.

Ok, I will add that as table.

>> +
>> +	frame->colorimetry = colorimetry_val & NORMAL_COLORIMETRY_MASK;
>> +	frame->extended_colorimetry = (colorimetry_val >> 2) &
>> +					EXTENDED_COLORIMETRY_MASK;
>> +}
>> +EXPORT_SYMBOL(drm_hdmi_avi_infoframe_colorspace);
>> +
>> +/**
>>   * drm_hdmi_avi_infoframe_quant_range() - fill the HDMI AVI infoframe
>>   *                                        quantization range information
>>   * @frame: HDMI AVI infoframe
>> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
>> index 4d9aa2f..efacf29 100644
>> --- a/include/drm/drm_connector.h
>> +++ b/include/drm/drm_connector.h
>> @@ -288,6 +288,26 @@ enum drm_panel_orientation {
>>  #define DRM_MODE_DP_COLORIMETRY_RGB_WIDE_GAMUT		16
>>  #define DRM_MODE_DP_COLORIMETRY_SCRGB			17
>>
>> +/* HDMI Colorspace Spec Definitions */
>> +#define FULL_COLORIMETRY_MASK				0x1FF
>> +#define NORMAL_COLORIMETRY_MASK				0x3
>> +#define EXTENDED_COLORIMETRY_MASK			0x7
>> +#define EXTENDED_ACE_COLORIMETRY_MASK			0xF
>> +
>> +#define HDMI_COLORIMETRY_NO_DATA			0x0
>> +#define HDMI_COLORIMETRY_SMPTE_170M_YCC			0x1
>> +#define HDMI_COLORIMETRY_BT709_YCC			0x2
>> +#define HDMI_COLORIMETRY_XVYCC_601			0x3
>> +#define HDMI_COLORIMETRY_XVYCC_709			0x7
>> +#define HDMI_COLORIMETRY_SYCC_601			0xB
>> +#define HDMI_COLORIMETRY_OPYCC_601			0xF
>> +#define HDMI_COLORIMETRY_OPRGB				0x13
>> +#define HDMI_COLORIMETRY_BT2020_CYCC			0x17
>> +#define HDMI_COLORIMETRY_BT2020_RGB			0x1C
>> +#define HDMI_COLORIMETRY_BT2020_YCC			0x1C
>
>Those should be 0x1b
>
>I would have suggested something like:
>#define C0(x) ((x) << 0)
>#define C1(x) ((x) << 1)
>#define EC0(x) ((x) << 2)
>#define EC1(x) ((x) << 3)
>etc.
>
>to make it easier to cross check against the spec. Or if a define for each bit is too
>much maybe just something like:
>
>#define C(x) ((x) << 0)
>#define EC(x) ((x) << 2)
>#define ACE(x) ((x) << 5)

This looks good, will modify as per this.

>One problem is namespace pollution though. But since these aren't used elsewhere
>we could move them into .c file instead. Or maybe we should stuff them into
>linux/hdmi.h and avoid the namespace pollution by C/EC/ACE by using an enum and
>undeffing the helper macros after the enum has been defined. The use of an enum
>would be in line with other stuff in hdmi.h.

Since no one else is supposed to be using this, should I just move it to the C file where we are
using them to avoid any namespace issues as such. If that is fine, will send out the next version
addressing all the comments.

Thanks Ville for the review and valuable inputs.

Regards,
Uma Shankar

>
>> +#define HDMI_COLORIMETRY_DCI_P3_RGB_D65			0x1F
>> +#define HDMI_COLORIMETRY_DCI_P3_RGB_THEATER		0x3F
>> +
>>  /**
>>   * struct drm_display_info - runtime data about the connected sink
>>   *
>> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index
>> 8dc1a08..9d3b5b9 100644
>> --- a/include/drm/drm_edid.h
>> +++ b/include/drm/drm_edid.h
>> @@ -331,6 +331,7 @@ struct cea_sad {
>>
>>  struct drm_encoder;
>>  struct drm_connector;
>> +struct drm_connector_state;
>>  struct drm_display_mode;
>>
>>  int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads); @@
>> -358,6 +359,11 @@ int drm_av_sync_delay(struct drm_connector
>> *connector,  drm_hdmi_vendor_infoframe_from_display_mode(struct
>hdmi_vendor_infoframe *frame,
>>  					    struct drm_connector *connector,
>>  					    const struct drm_display_mode *mode);
>> +
>> +void
>> +drm_hdmi_avi_infoframe_colorspace(struct hdmi_avi_infoframe *frame,
>> +				  const struct drm_connector_state *conn_state);
>> +
>>  void
>>  drm_hdmi_avi_infoframe_quant_range(struct hdmi_avi_infoframe *frame,
>>  				   struct drm_connector *connector,
>> --
>> 1.9.1
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>--
>Ville Syrjälä
>Intel


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