linux-kernel - [PATCH v11 08/14] drm/bridge: cdns-dsi: Add input format negotiation

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Message-Id: <20250329113925.68204-9-aradhya.bhatia@linux.dev>
Date: Sat, 29 Mar 2025 17:09:19 +0530
From: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>
Cc: Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Devarsh Thakkar <devarsht@...com>,
	Praneeth Bajjuri <praneeth@...com>,
	Udit Kumar <u-kumar1@...com>,
	Jayesh Choudhary <j-choudhary@...com>,
	Alexander Sverdlin <alexander.sverdlin@...mens.com>,
	Dominik Haller <d.haller@...tec.de>,
	DRI Development List <dri-devel@...ts.freedesktop.org>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Aradhya Bhatia <aradhya.bhatia@...ux.dev>
Subject: [PATCH v11 08/14] drm/bridge: cdns-dsi: Add input format negotiation

From: Aradhya Bhatia <a-bhatia1@...com>

Add support for the input format negotiation hook, that uses the helper
drm_mipi_dsi_get_input_bus_fmt() for dsi hosts, to figure out the
required input format.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Tested-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
Signed-off-by: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
---
 .../gpu/drm/bridge/cadence/cdns-dsi-core.c    | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
index 89a3f3efc522..c333b5c025d9 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -936,6 +936,33 @@ static void cdns_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 	cdns_dsi_hs_init(dsi);
 }
 
+static u32 *cdns_dsi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
+					       struct drm_bridge_state *bridge_state,
+					       struct drm_crtc_state *crtc_state,
+					       struct drm_connector_state *conn_state,
+					       u32 output_fmt,
+					       unsigned int *num_input_fmts)
+{
+	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
+	struct cdns_dsi *dsi = input_to_dsi(input);
+	struct cdns_dsi_output *output = &dsi->output;
+	u32 *input_fmts;
+
+	*num_input_fmts = 0;
+
+	input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
+	if (!input_fmts)
+		return NULL;
+
+	input_fmts[0] = drm_mipi_dsi_get_input_bus_fmt(output->dev->format);
+	if (!input_fmts[0])
+		return NULL;
+
+	*num_input_fmts = 1;
+
+	return input_fmts;
+}
+
 static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
 	.attach = cdns_dsi_bridge_attach,
 	.mode_valid = cdns_dsi_bridge_mode_valid,
@@ -946,6 +973,7 @@ static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
 	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_get_input_bus_fmts = cdns_dsi_bridge_get_input_bus_fmts,
 };
 
 static int cdns_dsi_attach(struct mipi_dsi_host *host,
-- 
2.34.1