[PATCH 06/20] drm: add helper to validate YCBCR420 modes
Ville Syrjälä
ville.syrjala at linux.intel.com
Wed Jul 12 17:18:01 UTC 2017
On Mon, Jul 10, 2017 at 04:48:34PM +0530, Shashank Sharma wrote:
> YCBCR420 modes are supported only on HDMI 2.0 capable sources.
> This patch adds:
> - A drm helper to validate YCBCR420-only mode on a particular
> connector. This function will help pruning the YCBCR420-only
> modes from the connector's modelist.
> - A bool variable (ycbcr_420_allowed) in the drm connector structure.
> While handling the EDID from HDMI 2.0 sinks, its important to know
> if the source is capable of handling YCBCR420 output, so that no
> YCBCR 420 modes will be listed for sources which can't handle it.
> A driver should set this variable if it wants to see YCBCR420 modes
> in the modedb.
>
> V5: Introduced the patch in series.
> V5-resend: Squashed two patches (validate YCBCR420 and add YCBCR420
> identifier)
>
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> ---
> drivers/gpu/drm/drm_edid.c | 3 ++-
> drivers/gpu/drm/drm_modes.c | 28 ++++++++++++++++++++++++++++
> drivers/gpu/drm/drm_probe_helper.c | 4 ++++
> include/drm/drm_connector.h | 9 +++++++++
> include/drm/drm_edid.h | 1 +
> include/drm/drm_modes.h | 5 +++++
> 6 files changed, 49 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 10dab62..44be128 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -2950,10 +2950,11 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
> }
> EXPORT_SYMBOL(drm_match_cea_mode);
>
> -static bool drm_valid_cea_vic(u8 vic)
> +bool drm_valid_cea_vic(u8 vic)
> {
> return vic > 0 && vic < ARRAY_SIZE(edid_cea_modes);
> }
> +EXPORT_SYMBOL(drm_valid_cea_vic);
>
> /**
> * drm_get_cea_aspect_ratio - get the picture aspect ratio corresponding to
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index f2493b9..3b53c8e3 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -1083,6 +1083,34 @@ drm_mode_validate_size(const struct drm_display_mode *mode,
> }
> EXPORT_SYMBOL(drm_mode_validate_size);
>
> +/**
> + * drm_mode_ycbcr420_only - add 'ycbcr420-only' modes only when allowed
> + * @mode: mode to check
> + * @connector: drm connector under action
> + *
> + * This function is a helper which can be used to filter out any YCBCR420
> + * only mode, when the source doesn't support it.
> + *
> + * Returns:
> + * The mode status
> + */
> +enum drm_mode_status
> +drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
> + struct drm_connector *connector)
> +{
> + u8 vic = drm_match_cea_mode(mode);
> + enum drm_mode_status status = MODE_OK;
> + struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
> +
> + if (drm_valid_cea_vic(vic) && test_bit(vic, hdmi->y420_vdb_modes)) {
Still think the valid check is pointless. Skipping that would also avoid
having to make the function non-static (the EXPORT_SYMBOL there seems
unnecessary either way).
> + if (!connector->ycbcr_420_allowed)
> + status = MODE_NO_420;
> + }
> +
> + return status;
> +}
> +EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
> +
> #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
>
> static const char * const drm_mode_status_names[] = {
^
This thing needs to be updated as well.
> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> index 00e6832..904966c 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -528,6 +528,10 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
> if (mode->status == MODE_OK)
> mode->status = drm_mode_validate_pipeline(mode,
> connector);
> +
> + if (mode->status == MODE_OK)
> + mode->status = drm_mode_validate_ycbcr420(mode,
> + connector);
> }
>
> prune:
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index b3af8e3..225e092 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -746,6 +746,15 @@ struct drm_connector {
> bool interlace_allowed;
> bool doublescan_allowed;
> bool stereo_allowed;
> +
> + /**
> + * @ycbcr_420_allowed : This bool indicates if this connector is
> + * capable of handling YCBCR 420 output. While parsing the EDID
> + * blocks, its very helpful to know, if the source is capable of
> + * handling YCBCR 420 outputs.
> + */
> + bool ycbcr_420_allowed;
> +
> /**
> * @registered: Is this connector exposed (registered) with userspace?
> * Protected by @mutex.
> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> index 89c0062..b55b2a7 100644
> --- a/include/drm/drm_edid.h
> +++ b/include/drm/drm_edid.h
> @@ -477,4 +477,5 @@ void drm_edid_get_monitor_name(struct edid *edid, char *name,
> struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
> int hsize, int vsize, int fresh,
> bool rb);
> +bool drm_valid_cea_vic(u8 vic);
> #endif /* __DRM_EDID_H__ */
> diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
> index 94ac771..f8a1268 100644
> --- a/include/drm/drm_modes.h
> +++ b/include/drm/drm_modes.h
> @@ -80,6 +80,7 @@ struct videomode;
> * @MODE_ONE_SIZE: only one resolution is supported
> * @MODE_NO_REDUCED: monitor doesn't accept reduced blanking
> * @MODE_NO_STEREO: stereo modes not supported
> + * @MODE_NO_420: ycbcr 420 modes not supported
> * @MODE_STALE: mode has become stale
> * @MODE_BAD: unspecified reason
> * @MODE_ERROR: error condition
> @@ -124,6 +125,7 @@ enum drm_mode_status {
> MODE_ONE_SIZE,
> MODE_NO_REDUCED,
> MODE_NO_STEREO,
> + MODE_NO_420,
> MODE_STALE = -3,
> MODE_BAD = -2,
> MODE_ERROR = -1
> @@ -496,6 +498,9 @@ bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
> enum drm_mode_status drm_mode_validate_basic(const struct drm_display_mode *mode);
> enum drm_mode_status drm_mode_validate_size(const struct drm_display_mode *mode,
> int maxX, int maxY);
> +enum drm_mode_status
> +drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
> + struct drm_connector *connector);
> void drm_mode_prune_invalid(struct drm_device *dev,
> struct list_head *mode_list, bool verbose);
> void drm_mode_sort(struct list_head *mode_list);
> --
> 2.7.4
>
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--
Ville Syrjälä
Intel OTC
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