From mboxrd@z Thu Jan 1 00:00:00 1970 From: sonika.jindal@intel.com Subject: [RFC] drm: Add utility function to check for edp1.4 Date: Wed, 22 Oct 2014 11:45:23 +0530 Message-ID: <1413958523-32742-1-git-send-email-sonika.jindal@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: alexdeucher@gmail.com, treding@nvidia.com, daniel.vetter@ffwll.ch List-Id: dri-devel@lists.freedesktop.org From: Sonika Jindal v2: Reading DP_EDP_REV, only when DISPLAY_CONTROL_CAPABLE field is set (Satheesh) v3: Moving the utility function to drm_dp_helper (Daniel) Signed-off-by: Sonika Jindal --- drivers/gpu/drm/drm_dp_helper.c | 15 +++++++++++++++ include/drm/drm_dp_helper.h | 2 ++ 2 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 08e33b8..a54a760 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -768,3 +768,18 @@ void drm_dp_aux_unregister(struct drm_dp_aux *aux) i2c_del_adapter(&aux->ddc); } EXPORT_SYMBOL(drm_dp_aux_unregister); + +bool drm_dp_is_edp_v1_4(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + uint8_t reg; + + if (dpcd[DP_EDP_CONFIGURATION_CAP] & + DP_DPCD_DISPLAY_CONTROL_CAPABLE) { + + if (drm_dp_dpcd_read(aux, DP_EDP_REV, ®, 1)) + if (reg == 0x03) + return true; + } + return false; +} +EXPORT_SYMBOL(drm_dp_is_edp_v1_4); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 8edeed0..b017e1e 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -102,6 +102,8 @@ #define DP_EDP_CONFIGURATION_CAP 0x00d /* XXX 1.2? */ #define DP_TRAINING_AUX_RD_INTERVAL 0x00e /* XXX 1.2? */ +#define DP_DPCD_DISPLAY_CONTROL_CAPABLE (1 << 3) +#define DP_EDP_REV 0x700 /* Multiple stream transport */ #define DP_FAUX_CAP 0x020 /* 1.2 */ -- 1.7.10.4