linux-kernel - [PATCH v1 1/4] drm: bridge: cdns-mhdp8546: Add output bus format negotiation

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Message-ID: <1605260794-29806-2-git-send-email-yamonkar@cadence.com>
Date:   Fri, 13 Nov 2020 10:46:31 +0100
From:   Yuti Amonkar <yamonkar@...ence.com>
To:     <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <maxime@...no.tech>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <mark.rutland@....com>, <a.hajda@...sung.com>,
        <narmstrong@...libre.com>, <Laurent.pinchart@...asonboard.com>,
        <jonas@...boo.se>, <jernej.skrabec@...l.net>
CC:     <nsekhar@...com>, <jsarha@...com>, <tomi.valkeinen@...com>,
        <nikhil.nd@...com>, <mparab@...ence.com>, <sjakhade@...ence.com>,
        <yamonkar@...ence.com>
Subject: [PATCH v1 1/4] drm: bridge: cdns-mhdp8546: Add output bus format negotiation

This patch adds minimal output bus format negotiation support.
Currently we are adding support for only MEDIA_BUS_FMT_FIXED.

Signed-off-by: Yuti Amonkar <yamonkar@...ence.com>
---
 .../drm/bridge/cadence/cdns-mhdp8546-core.c    | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index 6beccd2a408e..bdb0d95aa412 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -2102,6 +2102,23 @@ static u32 *cdns_mhdp_get_input_bus_fmts(struct drm_bridge *bridge,
 	return input_fmts;
 }
 
+static u32 *cdns_mhdp_get_output_bus_fmts(struct drm_bridge *bridge,
+					  struct drm_bridge_state *bridge_state,
+					  struct drm_crtc_state *crtc_state,
+					  struct drm_connector_state *conn_state,
+					  unsigned int *num_output_fmts)
+{
+	u32 *output_fmts;
+
+	output_fmts = kzalloc(sizeof(*output_fmts), GFP_KERNEL);
+	if (!output_fmts)
+		return NULL;
+
+	*num_output_fmts = 1;
+	output_fmts[0] = MEDIA_BUS_FMT_FIXED;
+	return output_fmts;
+}
+
 static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
 				  struct drm_bridge_state *bridge_state,
 				  struct drm_crtc_state *crtc_state,
@@ -2170,6 +2187,7 @@ static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
 	.atomic_destroy_state = cdns_mhdp_bridge_atomic_destroy_state,
 	.atomic_reset = cdns_mhdp_bridge_atomic_reset,
 	.atomic_get_input_bus_fmts = cdns_mhdp_get_input_bus_fmts,
+	.atomic_get_output_bus_fmts = cdns_mhdp_get_output_bus_fmts,
 	.detect = cdns_mhdp_bridge_detect,
 	.get_edid = cdns_mhdp_bridge_get_edid,
 	.hpd_enable = cdns_mhdp_bridge_hpd_enable,
-- 
2.17.1