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From:   Bjorn Andersson <bjorn.andersson@linaro.org>
To:     Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Abhinav Kumar <abhinavk@codeaurora.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Kalyan Thota <kalyan_t@codeaurora.org>,
        Kuogee Hsieh <khsieh@codeaurora.org>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Stephen Boyd <swboyd@chromium.org>,
        linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
        freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/5] drm/msm/dp: Remove global g_dp_display variable
Date:   Sat, 24 Jul 2021 21:24:31 -0700
Message-Id: <20210725042436.3967173-2-bjorn.andersson@linaro.org>
In-Reply-To: <20210725042436.3967173-1-bjorn.andersson@linaro.org>
References: <20210725042436.3967173-1-bjorn.andersson@linaro.org>
MIME-Version: 1.0
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As the Qualcomm DisplayPort driver only supports a single instance of
the driver the commonly used struct dp_display is kept in a global
variable. As we introduce additional instances this obviously doesn't
work.

Replace this with a combination of existing references to adjacent
objects and drvdata.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 78 ++++++++++++++---------------
 1 file changed, 37 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 70b319a8fe83..8696b36d30e4 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -27,7 +27,6 @@
 #include "dp_audio.h"
 #include "dp_debug.h"
 
-static struct msm_dp *g_dp_display;
 #define HPD_STRING_SIZE 30
 
 enum {
@@ -122,6 +121,13 @@ static const struct of_device_id dp_dt_match[] = {
 	{}
 };
 
+static struct dp_display_private *dev_to_dp_display_private(struct device *dev)
+{
+	struct msm_dp *dp = dev_get_drvdata(dev);
+
+	return container_of(dp, struct dp_display_private, dp_display);
+}
+
 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
 						u32 data, u32 delay)
 {
@@ -198,14 +204,16 @@ static int dp_display_bind(struct device *dev, struct device *master,
 			   void *data)
 {
 	int rc = 0;
-	struct dp_display_private *dp;
+	struct dp_display_private *dp = dev_to_dp_display_private(dev);
 	struct drm_device *drm;
 	struct msm_drm_private *priv;
 
 	drm = dev_get_drvdata(master);
 
-	dp = container_of(g_dp_display,
-			struct dp_display_private, dp_display);
+	if (!dp) {
+		DRM_ERROR("DP driver bind failed. Invalid driver data\n");
+		return -EINVAL;
+	}
 
 	dp->dp_display.drm_dev = drm;
 	priv = drm->dev_private;
@@ -240,12 +248,14 @@ static int dp_display_bind(struct device *dev, struct device *master,
 static void dp_display_unbind(struct device *dev, struct device *master,
 			      void *data)
 {
-	struct dp_display_private *dp;
+	struct dp_display_private *dp = dev_to_dp_display_private(dev);
 	struct drm_device *drm = dev_get_drvdata(master);
 	struct msm_drm_private *priv = drm->dev_private;
 
-	dp = container_of(g_dp_display,
-			struct dp_display_private, dp_display);
+	if (!dp) {
+		DRM_ERROR("Invalid DP driver data\n");
+		return;
+	}
 
 	dp_power_client_deinit(dp->power);
 	dp_aux_unregister(dp->aux);
@@ -376,17 +386,14 @@ static void dp_display_host_deinit(struct dp_display_private *dp)
 static int dp_display_usbpd_configure_cb(struct device *dev)
 {
 	int rc = 0;
-	struct dp_display_private *dp;
+	struct dp_display_private *dp = dev_to_dp_display_private(dev);
 
-	if (!dev) {
-		DRM_ERROR("invalid dev\n");
-		rc = -EINVAL;
+	if (!dp) {
+		DRM_ERROR("no driver data found\n");
+		rc = -ENODEV;
 		goto end;
 	}
 
-	dp = container_of(g_dp_display,
-			struct dp_display_private, dp_display);
-
 	dp_display_host_init(dp, false);
 
 	rc = dp_display_process_hpd_high(dp);
@@ -397,17 +404,14 @@ static int dp_display_usbpd_configure_cb(struct device *dev)
 static int dp_display_usbpd_disconnect_cb(struct device *dev)
 {
 	int rc = 0;
-	struct dp_display_private *dp;
+	struct dp_display_private *dp = dev_to_dp_display_private(dev);
 
-	if (!dev) {
-		DRM_ERROR("invalid dev\n");
-		rc = -EINVAL;
+	if (!dp) {
+		DRM_ERROR("no driver data found\n");
+		rc = -ENODEV;
 		return rc;
 	}
 
-	dp = container_of(g_dp_display,
-			struct dp_display_private, dp_display);
-
 	dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
 
 	return rc;
@@ -466,15 +470,15 @@ static int dp_display_usbpd_attention_cb(struct device *dev)
 {
 	int rc = 0;
 	u32 sink_request;
-	struct dp_display_private *dp;
+	struct dp_display_private *dp = dev_to_dp_display_private(dev);
+	struct dp_usbpd *hpd;
 
-	if (!dev) {
-		DRM_ERROR("invalid dev\n");
-		return -EINVAL;
+	if (!dp) {
+		DRM_ERROR("no driver data found\n");
+		return -ENODEV;
 	}
 
-	dp = container_of(g_dp_display,
-			struct dp_display_private, dp_display);
+	hpd = dp->usbpd;
 
 	/* check for any test request issued by sink */
 	rc = dp_link_process_request(dp->link);
@@ -638,7 +642,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
 	dp_add_event(dp, EV_DISCONNECT_PENDING_TIMEOUT, 0, DP_TIMEOUT_5_SECOND);
 
 	/* signal the disconnect event early to ensure proper teardown */
-	dp_display_handle_plugged_change(g_dp_display, false);
+	dp_display_handle_plugged_change(&dp->dp_display, false);
 
 	/* enable HDP plug interrupt to prepare for next plugin */
 	dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, true);
@@ -832,9 +836,7 @@ static int dp_display_prepare(struct msm_dp *dp)
 static int dp_display_enable(struct dp_display_private *dp, u32 data)
 {
 	int rc = 0;
-	struct msm_dp *dp_display;
-
-	dp_display = g_dp_display;
+	struct msm_dp *dp_display = &dp->dp_display;
 
 	if (dp_display->power_on) {
 		DRM_DEBUG_DP("Link already setup, return\n");
@@ -869,9 +871,7 @@ static int dp_display_post_enable(struct msm_dp *dp_display)
 
 static int dp_display_disable(struct dp_display_private *dp, u32 data)
 {
-	struct msm_dp *dp_display;
-
-	dp_display = g_dp_display;
+	struct msm_dp *dp_display = &dp->dp_display;
 
 	if (!dp_display->power_on)
 		return 0;
@@ -1229,14 +1229,13 @@ static int dp_display_probe(struct platform_device *pdev)
 	}
 
 	mutex_init(&dp->event_mutex);
-	g_dp_display = &dp->dp_display;
 
 	/* Store DP audio handle inside DP display */
-	g_dp_display->dp_audio = dp->audio;
+	dp->dp_display.dp_audio = dp->audio;
 
 	init_completion(&dp->audio_comp);
 
-	platform_set_drvdata(pdev, g_dp_display);
+	platform_set_drvdata(pdev, &dp->dp_display);
 
 	rc = component_add(&pdev->dev, &dp_display_comp_ops);
 	if (rc) {
@@ -1249,10 +1248,7 @@ static int dp_display_probe(struct platform_device *pdev)
 
 static int dp_display_remove(struct platform_device *pdev)
 {
-	struct dp_display_private *dp;
-
-	dp = container_of(g_dp_display,
-			struct dp_display_private, dp_display);
+	struct dp_display_private *dp = platform_get_drvdata(pdev);
 
 	dp_display_deinit_sub_modules(dp);
 
-- 
2.29.2