Nouveau - May 2016 - [PATCH v2 2/2] nouveau/bl: Do not register interface if Apple GMUX detected

The Apple GMUX is the one managing the backlight, so there is no need for
Nouveau to register its own backlight interface.

Signed-off-by: Pierre Moreau <pierre.morrow at free.fr>
---
 drm/nouveau/nouveau_backlight.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drm/nouveau/nouveau_backlight.c b/drm/nouveau/nouveau_backlight.c
index 41330e4..94ac3cb 100644
--- a/drm/nouveau/nouveau_backlight.c
+++ b/drm/nouveau/nouveau_backlight.c
@@ -30,6 +30,7 @@
  * Register locations derived from NVClock by Roderick Colenbrander
  */
 
+#include <linux/apple-gmux.h>
 #include <linux/backlight.h>
 #include <linux/idr.h>
 
@@ -257,6 +258,12 @@ nouveau_backlight_init(struct drm_device *dev)
 	struct nvif_device *device = &drm->device;
 	struct drm_connector *connector;
 
+	if (apple_gmux_present()) {
+		NV_INFO(drm, "Apple GMUX detected: not registering Nouveau"
+		    " backlight interface");
+		return 0;
+	}
+
 	INIT_LIST_HEAD(&drm->bl_connectors);
 
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
{
-- 
2.8.0

Hi,

On Sun, Apr 17, 2016 at 09:57:42PM +0200, Pierre Moreau
wrote:
> The Apple GMUX is the one managing the backlight, so there is no need for
> Nouveau to register its own backlight interface.
> 
> Signed-off-by: Pierre Moreau <pierre.morrow at free.fr>
> ---
>  drm/nouveau/nouveau_backlight.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drm/nouveau/nouveau_backlight.c
b/drm/nouveau/nouveau_backlight.c
> index 41330e4..94ac3cb 100644
> --- a/drm/nouveau/nouveau_backlight.c
> +++ b/drm/nouveau/nouveau_backlight.c
> @@ -30,6 +30,7 @@
>   * Register locations derived from NVClock by Roderick Colenbrander
>   */
>  
> +#include <linux/apple-gmux.h>
>  #include <linux/backlight.h>
>  #include <linux/idr.h>
>  
> @@ -257,6 +258,12 @@ nouveau_backlight_init(struct drm_device *dev)
>  	struct nvif_device *device = &drm->device;
>  	struct drm_connector *connector;
>  
> +	if (apple_gmux_present()) {
> +		NV_INFO(drm, "Apple GMUX detected: not registering Nouveau"
> +		    " backlight interface");
Small nit -- Documentation/CodingStyle, chapter 2 says:

"However, never break user-visible strings such as
printk messages, because that breaks the ability to grep for them."

Thanks,

Lukas
> +		return 0;
> +	}
> +
>  	INIT_LIST_HEAD(&drm->bl_connectors);
>  
>  	list_for_each_entry(connector, &dev->mode_config.connector_list,
head) {
> -- 
> 2.8.0

The Apple GMUX is the one managing the backlight, so there is no need for
Nouveau to register its own backlight interface.

v2: Do not split information message on two lines as it prevents from grepping
    it, as pointed out by Hans de Goede

Signed-off-by: Pierre Moreau <pierre.morrow at free.fr>
---
 drm/nouveau/nouveau_backlight.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drm/nouveau/nouveau_backlight.c b/drm/nouveau/nouveau_backlight.c
index 41330e4..8429ceb 100644
--- a/drm/nouveau/nouveau_backlight.c
+++ b/drm/nouveau/nouveau_backlight.c
@@ -30,6 +30,7 @@
  * Register locations derived from NVClock by Roderick Colenbrander
  */
 
+#include <linux/apple-gmux.h>
 #include <linux/backlight.h>
 #include <linux/idr.h>
 
@@ -257,6 +258,11 @@ nouveau_backlight_init(struct drm_device *dev)
 	struct nvif_device *device = &drm->device;
 	struct drm_connector *connector;
 
+	if (apple_gmux_present()) {
+		NV_INFO(drm, "Apple GMUX detected: not registering Nouveau backlight
interface");
+		return 0;
+	}
+
 	INIT_LIST_HEAD(&drm->bl_connectors);
 
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
{
-- 
2.8.2

On 02:32 PM - May 01 2016, Pierre Moreau wrote:
> The Apple GMUX is the one managing the backlight, so there is no need for
> Nouveau to register its own backlight interface.
> 
> v2: Do not split information message on two lines as it prevents from
grepping
>     it, as pointed out by Hans de Goede
It should be "it, as pointed out by Lukas Wunner", sorry for the
mistake… :-/

Pierre
> 
> Signed-off-by: Pierre Moreau <pierre.morrow at free.fr>
> ---
>  drm/nouveau/nouveau_backlight.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drm/nouveau/nouveau_backlight.c
b/drm/nouveau/nouveau_backlight.c
> index 41330e4..8429ceb 100644
> --- a/drm/nouveau/nouveau_backlight.c
> +++ b/drm/nouveau/nouveau_backlight.c
> @@ -30,6 +30,7 @@
>   * Register locations derived from NVClock by Roderick Colenbrander
>   */
>  
> +#include <linux/apple-gmux.h>
>  #include <linux/backlight.h>
>  #include <linux/idr.h>
>  
> @@ -257,6 +258,11 @@ nouveau_backlight_init(struct drm_device *dev)
>  	struct nvif_device *device = &drm->device;
>  	struct drm_connector *connector;
>  
> +	if (apple_gmux_present()) {
> +		NV_INFO(drm, "Apple GMUX detected: not registering Nouveau
backlight interface");
> +		return 0;
> +	}
> +
>  	INIT_LIST_HEAD(&drm->bl_connectors);
>  
>  	list_for_each_entry(connector, &dev->mode_config.connector_list,
head) {
> -- 
> 2.8.2
> 
> _______________________________________________
> Nouveau mailing list
> Nouveau at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: not available
URL:
<https://lists.freedesktop.org/archives/nouveau/attachments/20160501/69b33442/attachment.sig>