linux-kernel - [PATCH v4 09/11] drm/bridge: cdns-dsi: Support atomic bridge APIs

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Date: Sat, 22 Jun 2024 16:39:27 +0530
From: Aradhya Bhatia <a-bhatia1@...com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Tomi Valkeinen
	<tomi.valkeinen@...asonboard.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman
	<jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maarten
 Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard
	<mripard@...nel.org>, Jyri Sarha <jyri.sarha@....fi>,
        Thomas Zimmermann
	<tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Daniel Vetter
	<daniel@...ll.ch>
CC: DRI Development List <dri-devel@...ts.freedesktop.org>,
        Linux Kernel List
	<linux-kernel@...r.kernel.org>,
        Dominik Haller <d.haller@...tec.de>, Sam
 Ravnborg <sam@...nborg.org>,
        Thierry Reding <treding@...dia.com>,
        Kieran
 Bingham <kieran.bingham+renesas@...asonboard.com>,
        Nishanth Menon
	<nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Praneeth Bajjuri
	<praneeth@...com>, Udit Kumar <u-kumar1@...com>,
        Devarsh Thakkar
	<devarsht@...com>,
        Jayesh Choudhary <j-choudhary@...com>, Jai Luthra
	<j-luthra@...com>,
        Aradhya Bhatia <a-bhatia1@...com>
Subject: [PATCH v4 09/11] drm/bridge: cdns-dsi: Support atomic bridge APIs

Change the existing (and deprecated) bridge hooks, to the bridge
atomic APIs.

Add drm helpers for duplicate_state, destroy_state, and bridge_reset
bridge hooks.

Further add support for the input format negotiation hook.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
---
 .../gpu/drm/bridge/cadence/cdns-dsi-core.c    | 51 ++++++++++++++++---
 1 file changed, 43 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
index cad0c1478ef0..c9697818308e 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -655,7 +655,8 @@ cdns_dsi_bridge_mode_valid(struct drm_bridge *bridge,
 	return MODE_OK;
 }
 
-static void cdns_dsi_bridge_disable(struct drm_bridge *bridge)
+static void cdns_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
+					   struct drm_bridge_state *old_bridge_state)
 {
 	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
 	struct cdns_dsi *dsi = input_to_dsi(input);
@@ -679,7 +680,8 @@ static void cdns_dsi_bridge_disable(struct drm_bridge *bridge)
 	pm_runtime_put(dsi->base.dev);
 }
 
-static void cdns_dsi_bridge_post_disable(struct drm_bridge *bridge)
+static void cdns_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,
+						struct drm_bridge_state *old_bridge_state)
 {
 	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
 	struct cdns_dsi *dsi = input_to_dsi(input);
@@ -755,7 +757,8 @@ static void cdns_dsi_init_link(struct cdns_dsi *dsi)
 	dsi->link_initialized = true;
 }
 
-static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
+static void cdns_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
+					  struct drm_bridge_state *old_bridge_state)
 {
 	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
 	struct cdns_dsi *dsi = input_to_dsi(input);
@@ -906,7 +909,8 @@ static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
 	writel(tmp, dsi->regs + MCTL_MAIN_EN);
 }
 
-static void cdns_dsi_bridge_pre_enable(struct drm_bridge *bridge)
+static void cdns_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+					      struct drm_bridge_state *old_bridge_state)
 {
 	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
 	struct cdns_dsi *dsi = input_to_dsi(input);
@@ -918,13 +922,44 @@ static void cdns_dsi_bridge_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,
-	.disable = cdns_dsi_bridge_disable,
-	.pre_enable = cdns_dsi_bridge_pre_enable,
-	.enable = cdns_dsi_bridge_enable,
-	.post_disable = cdns_dsi_bridge_post_disable,
+	.atomic_disable = cdns_dsi_bridge_atomic_disable,
+	.atomic_pre_enable = cdns_dsi_bridge_atomic_pre_enable,
+	.atomic_enable = cdns_dsi_bridge_atomic_enable,
+	.atomic_post_disable = cdns_dsi_bridge_atomic_post_disable,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.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