diff mbox series

[1/5] drm/msm/dp: Remove global g_dp_display variable

Message ID 20210725042436.3967173-2-bjorn.andersson@linaro.org (mailing list archive)
State New, archived
Headers show
Series drm/msm/dp: Support multiple DP instances and add sc8180x | expand

Commit Message

Bjorn Andersson July 25, 2021, 4:24 a.m. UTC
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(-)

Comments

Stephen Boyd July 26, 2021, 11:11 p.m. UTC | #1
Quoting Bjorn Andersson (2021-07-24 21:24:31)
> 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>
> ---

Thanks for removing the global.

>  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) {

How can it be NULL? dev_to_dp_display_private() returns container_of()
pointer so it doesn't look possible.

> +               DRM_ERROR("DP driver bind failed. Invalid driver data\n");
> +               return -EINVAL;
> +       }
>
>         dp->dp_display.drm_dev = drm;
>         priv = drm->dev_private;
Dmitry Baryshkov July 27, 2021, 6:15 p.m. UTC | #2
On 25/07/2021 07:24, Bjorn Andersson wrote:
> 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)

dev_get_dp_display_private() ?

> +{
> +	struct msm_dp *dp = dev_get_drvdata(dev);
> +
> +	return container_of(dp, struct dp_display_private, dp_display);
> +}
> +

As a matter of preference, it might be cleaner to inline dev_get_drvdata 
and then define msm_dp_get_private to convert from msm_dp to 
dp_display_private, see below.

>   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) {

This is not correct, if I'm not mistaken. you wanted to check if dev's 
private data is NULL (correct check), but ended up checking whether the 
result of container_of is NULL (incorrect).

> +		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;

`!dev` check should remain in place. And dp should be fetched 
afterwards. This applies to all the checks in the patch.

> +	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);

dev_to_dp_display_private() rather than just get_drvdata?

>   
>   	dp_display_deinit_sub_modules(dp);
>   
>
Abhinav Kumar July 30, 2021, 11:37 p.m. UTC | #3
On 2021-07-24 21:24, Bjorn Andersson wrote:
> 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;
hpd is unused here. It was removed with 
https://patches.linaro.org/patch/416670/

> 
>  	/* 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);
diff mbox series

Patch

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);