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drm/dp/fec: DRM helper for Forward Error Correction 

DP 1.4 has Forward Error Correction Support(FEC).
Add helper function to check if the sink device
supports FEC.

v2: Separate the helper and the code that uses the helper into
two separate patches. (Manasi)

v3:
- Move the code to drm_dp_helper.c (Manasi)
- change the return type, code style changes (Gaurav)
- Use drm_dp_dpcd_readb instead of drm_dp_dpcd_read. (Jani)

v4:
- Avoid aux reads everytime, instead read cached
values of dpcd register (jani)
- Move helper to drm_dp_helper.h like other dsc
helpers.(Anusha)

v5: rebased. Change the helper parameter suitably.

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Acked-by: Sean Paul <seanpaul@chromium.org> (For merging through
drm-intel)
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181102041455.15818-2-anusha.srivatsa@intel.com
This commit is contained in:
Anusha Srivatsa 2018-11-01 21:14:55 -07:00 committed by Manasi Navare
parent 08cadae8e1
commit 857d828374
1 changed files with 7 additions and 0 deletions
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7
include/drm/drm_dp_helper.h
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@ -1147,6 +1147,13 @@ drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
DP_DSC_SLICE_WIDTH_MULTIPLIER;
}
/* Forward Error Correction Support on DP 1.4 */
static inline bool
drm_dp_sink_supports_fec(const u8 fec_capable)
{
return fec_capable & DP_FEC_CAPABLE;
}
/*
* DisplayPort AUX channel
*/