From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25A3C17BBE for ; Mon, 12 Feb 2024 10:13:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707732826; cv=none; b=ct6EijAsfDppGF5f8G+1+IxyLekU2W/sOUqkuWYwk3G818pH9fuvOivZH0wOSRvroO/8EsLNOJ1jzNTuVtSxpOc+OnUjbalXABHBo/4li8eEWNNi6HILcNmpotPGGSXKXG+OsMUJsUKASXHrtw1IBFI+w4dvcvSgfe+soBQsI7o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707732826; c=relaxed/simple; bh=b5yCS+oa4RLidNsPnjoIz0El0jlSvCjtFpTobsF8c/k=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=p2R0XBl6+mBxw5kRfUqXqsqBtQkx7IcOcZ5PGxJ1CPsPajU9nLT1EGXS2Jj4vqrpAFsIJ8r9iPVy9ZIUH8B3+4i+LLLGKi3RI+Eimtrhb7OSbWcWxIBCpN7oTLwOGP9UtiX/ZoQScNN+y82Fi0qRWH9j8l19XkPV+d4Yr9vheTs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=BUbQvxKU; arc=none smtp.client-ip=192.198.163.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="BUbQvxKU" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1707732825; x=1739268825; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version; bh=b5yCS+oa4RLidNsPnjoIz0El0jlSvCjtFpTobsF8c/k=; b=BUbQvxKUpg7Wli9zzblglGb7nBEKV6tXP63ePzIB9UKoTFgZlM1PD5Tn awZSmLQGCeF3QucE4cCq4LXn7WQZZIo8NxSjaN8QDmAbCxNX1cce9l7s9 /mxj9IfHcWGg+sun86jtHQwhCaK7ReB121MSpGbo+Gnu63HIo9xpwkfbD XLK8zDAdFffb2EspLMPlm9TRE7jPu7QDrz8Yqa2Tj209I06+gxnmrJLbN rE6K1M3WqK7NwM89cUh6IRyjYihs12agHjMqYU5TiUDYGFRUSuf8309sq VtzLphJj9fg/GNkqXmEEthbsF0UcCW993+Lgyxxepe0/jiigeOqiy44u3 g==; X-IronPort-AV: E=McAfee;i="6600,9927,10981"; a="1581057" X-IronPort-AV: E=Sophos;i="6.05,262,1701158400"; d="scan'208";a="1581057" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2024 02:13:44 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.05,262,1701158400"; d="scan'208";a="7296805" Received: from belyakov-mobl.ccr.corp.intel.com (HELO localhost) ([10.252.63.91]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2024 02:13:39 -0800 From: Jani Nikula To: Abhinav Kumar , dri-devel@lists.freedesktop.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter Cc: Paloma Arellano , robdclark@gmail.com, freedreno@lists.freedesktop.org, dmitry.baryshkov@linaro.org, intel-gfx@lists.freedesktop.org, ville.syrjala@linux.intel.com, quic_jesszhan@quicinc.com, Abhinav Kumar , linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] drm/dp: add an API to indicate if sink supports VSC SDP In-Reply-To: <20240210202704.977303-1-quic_abhinavk@quicinc.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20240210202704.977303-1-quic_abhinavk@quicinc.com> Date: Mon, 12 Feb 2024 12:13:34 +0200 Message-ID: <87il2u9ei9.fsf@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Sat, 10 Feb 2024, Abhinav Kumar wrote: > From: Paloma Arellano > > YUV420 format is supported only in the VSC SDP packet and not through > MSA. Hence add an API which indicates the sink support which can be used > by the rest of the DP programming. > > changes in v3: > - fix the commit title prefix to drm/dp > - get rid of redundant !! > - break out this change from series [1] to get acks from drm core > maintainers > > Changes in v2: > - Move VSC SDP support check API from dp_panel.c to > drm_dp_helper.c > > [1]: https://patchwork.freedesktop.org/series/129180/ > > Reviewed-by: Dmitry Baryshkov > Signed-off-by: Paloma Arellano > Signed-off-by: Abhinav Kumar > --- > drivers/gpu/drm/display/drm_dp_helper.c | 21 +++++++++++++++++++++ > include/drm/display/drm_dp_helper.h | 1 + > 2 files changed, 22 insertions(+) > > diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c > index b1ca3a1100da..7a851f92b249 100644 > --- a/drivers/gpu/drm/display/drm_dp_helper.c > +++ b/drivers/gpu/drm/display/drm_dp_helper.c > @@ -2916,6 +2916,27 @@ void drm_dp_vsc_sdp_log(const char *level, struct device *dev, > } > EXPORT_SYMBOL(drm_dp_vsc_sdp_log); > > +/** > + * drm_dp_vsc_sdp_supported() - check if vsc sdp is supported > + * @aux: DisplayPort AUX channel > + * @dpcd: DisplayPort configuration data > + * > + * Returns true if vsc sdp is supported, else returns false > + */ > +bool drm_dp_vsc_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]) > +{ > + u8 rx_feature; > + > + if (drm_dp_dpcd_readb(aux, DP_DPRX_FEATURE_ENUMERATION_LIST, &rx_feature) != 1) { > + drm_dbg_dp(aux->drm_dev, "failed to read DP_DPRX_FEATURE_ENUMERATION_LIST\n"); > + return false; > + } > + > + return (dpcd[DP_DPCD_REV] >= DP_DPCD_REV_13) && > + (rx_feature & DP_VSC_SDP_EXT_FOR_COLORIMETRY_SUPPORTED); I guess you could bail out early without further dpcd access with the dpcd rev check? BR, Jani. > +} > +EXPORT_SYMBOL(drm_dp_vsc_sdp_supported); > + > /** > * drm_dp_get_pcon_max_frl_bw() - maximum frl supported by PCON > * @dpcd: DisplayPort configuration data > diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h > index 863b2e7add29..948381b2b0b1 100644 > --- a/include/drm/display/drm_dp_helper.h > +++ b/include/drm/display/drm_dp_helper.h > @@ -100,6 +100,7 @@ struct drm_dp_vsc_sdp { > > void drm_dp_vsc_sdp_log(const char *level, struct device *dev, > const struct drm_dp_vsc_sdp *vsc); > +bool drm_dp_vsc_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); > > int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]); -- Jani Nikula, Intel