linux-kernel - [PATCH v6 16/21] drm/bridge: sn65dsi86: Switch to devm MIPI-DSI helpers

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Message-Id: <20211025151536.1048186-17-maxime@cerno.tech>
Date:   Mon, 25 Oct 2021 17:15:31 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Robert Foss <robert.foss@...aro.org>,
        Jonas Karlman <jonas@...boo.se>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Seung-Woo Kim <sw0312.kim@...sung.com>,
        linux-arm-msm@...r.kernel.org,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Rob Clark <robdclark@...il.com>,
        Tian Tao <tiantao6@...ilicon.com>,
        Chen Feng <puck.chen@...ilicon.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-samsung-soc@...r.kernel.org,
        Xinliang Liu <xinliang.liu@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        linux-kernel@...r.kernel.org, Inki Dae <inki.dae@...sung.com>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Sean Paul <sean@...rly.run>
Subject: [PATCH v6 16/21] drm/bridge: sn65dsi86: Switch to devm MIPI-DSI helpers

Let's switch to the new devm MIPI-DSI function to register and attach
our secondary device. This also avoids leaking the device when we detach
the bridge.

Acked-by: Sam Ravnborg <sam@...nborg.org>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 6154bed0af5b..36a82e3d17ab 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -662,6 +662,7 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 	struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
 	struct mipi_dsi_host *host;
 	struct mipi_dsi_device *dsi;
+	struct device *dev = pdata->dev;
 	const struct mipi_dsi_device_info info = { .type = "ti_sn_bridge",
 						   .channel = 0,
 						   .node = NULL,
@@ -701,7 +702,7 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 		goto err_dsi_host;
 	}
 
-	dsi = mipi_dsi_device_register_full(host, &info);
+	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 	if (IS_ERR(dsi)) {
 		DRM_ERROR("failed to create dsi device\n");
 		ret = PTR_ERR(dsi);
@@ -714,16 +715,16 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
 
 	/* check if continuous dsi clock is required or not */
-	pm_runtime_get_sync(pdata->dev);
+	pm_runtime_get_sync(dev);
 	regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val);
-	pm_runtime_put_autosuspend(pdata->dev);
+	pm_runtime_put_autosuspend(dev);
 	if (!(val & DPPLL_CLK_SRC_DSICLK))
 		dsi->mode_flags |= MIPI_DSI_CLOCK_NON_CONTINUOUS;
 
-	ret = mipi_dsi_attach(dsi);
+	ret = devm_mipi_dsi_attach(dev, dsi);
 	if (ret < 0) {
 		DRM_ERROR("failed to attach dsi to host\n");
-		goto err_dsi_attach;
+		goto err_dsi_host;
 	}
 	pdata->dsi = dsi;
 
@@ -734,14 +735,10 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 	ret = drm_bridge_attach(bridge->encoder, pdata->next_bridge,
 				&pdata->bridge, flags);
 	if (ret < 0)
-		goto err_dsi_detach;
+		goto err_dsi_host;
 
 	return 0;
 
-err_dsi_detach:
-	mipi_dsi_detach(dsi);
-err_dsi_attach:
-	mipi_dsi_device_unregister(dsi);
 err_dsi_host:
 	drm_connector_cleanup(&pdata->connector);
 err_conn_init:
@@ -1237,11 +1234,6 @@ static void ti_sn_bridge_remove(struct auxiliary_device *adev)
 	if (!pdata)
 		return;
 
-	if (pdata->dsi) {
-		mipi_dsi_detach(pdata->dsi);
-		mipi_dsi_device_unregister(pdata->dsi);
-	}
-
 	drm_bridge_remove(&pdata->bridge);
 
 	of_node_put(pdata->host_node);
-- 
2.31.1