Re: [Nouveau] [PATCH 6.2 regression fix] drm/nouveau/kms: Fix backlight registration
Hi,
On 3/29/23 00:23, Lyude Paul wrote:
> Reviewed-by: Lyude Paul
>
> (Also note to Mark: this is my way of letting you know someone fixed the
> regression with backlight controls upstream, looking into the weird bright
> screen after resume issue)
Thanks.
I have pushed this to drm-misc-fixes now.
I'll also submit a downstream Fedora kernel pull-req with this
to get this resolved in the Fedora kernels .
Regards,
Hans
>
> On Sun, 2023-03-26 at 22:54 +0200, Hans de Goede wrote:
>> The nouveau code used to call drm_fb_helper_initial_config() from
>> nouveau_fbcon_init() before calling drm_dev_register(). This would
>> probe all connectors so that drm_connector->status could be used during
>> backlight registration which runs from nouveau_connector_late_register().
>>
>> After commit 4a16dd9d18a0 ("drm/nouveau/kms: switch to drm fbdev helpers")
>> the fbdev emulation code, which now is a drm-client, can only run after
>> drm_dev_register(). So during backlight registration the connectors are
>> not probed yet and the drm_connector->status == connected check in
>> nv50_backlight_init() would now always fail.
>>
>> Replace the drm_connector->status == connected check with
>> a drm_helper_probe_detect() == connected check to fix nv_backlight
>> no longer getting registered because of this.
>>
>> Fixes: 4a16dd9d18a0 ("drm/nouveau/kms: switch to drm fbdev helpers")
>> Link: https://gitlab.freedesktop.org/drm/nouveau/-/issues/202
>> Signed-off-by: Hans de Goede
>> ---
>> drivers/gpu/drm/nouveau/nouveau_backlight.c | 7 ++-
>> 1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c
>> b/drivers/gpu/drm/nouveau/nouveau_backlight.c
>> index 40409a29f5b6..91b5ecc57538 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
>> @@ -33,6 +33,7 @@
>> #include
>> #include
>> #include
>> +#include
>>
>> #include "nouveau_drv.h"
>> #include "nouveau_reg.h"
>> @@ -299,8 +300,12 @@ nv50_backlight_init(struct nouveau_backlight *bl,
>> struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
>> struct nvif_object *device = >client.device.object;
>>
>> +/*
>> + * Note when this runs the connectors have not been probed yet,
>> + * so nv_conn->base.status is not set yet.
>> + */
>> if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or)
>> - 1)) ||
>> -nv_conn->base.status != connector_status_connected)
>> +drm_helper_probe_detect(_conn->base, NULL, false) !=
>> connector_status_connected)
>> return -ENODEV;
>>
>> if (nv_conn->type == DCB_CONNECTOR_eDP) {
>
Re: [Nouveau] [PATCH 6.2 regression fix] drm/nouveau/kms: Fix backlight registration
Reviewed-by: Lyude Paul
(Also note to Mark: this is my way of letting you know someone fixed the
regression with backlight controls upstream, looking into the weird bright
screen after resume issue)
On Sun, 2023-03-26 at 22:54 +0200, Hans de Goede wrote:
> The nouveau code used to call drm_fb_helper_initial_config() from
> nouveau_fbcon_init() before calling drm_dev_register(). This would
> probe all connectors so that drm_connector->status could be used during
> backlight registration which runs from nouveau_connector_late_register().
>
> After commit 4a16dd9d18a0 ("drm/nouveau/kms: switch to drm fbdev helpers")
> the fbdev emulation code, which now is a drm-client, can only run after
> drm_dev_register(). So during backlight registration the connectors are
> not probed yet and the drm_connector->status == connected check in
> nv50_backlight_init() would now always fail.
>
> Replace the drm_connector->status == connected check with
> a drm_helper_probe_detect() == connected check to fix nv_backlight
> no longer getting registered because of this.
>
> Fixes: 4a16dd9d18a0 ("drm/nouveau/kms: switch to drm fbdev helpers")
> Link: https://gitlab.freedesktop.org/drm/nouveau/-/issues/202
> Signed-off-by: Hans de Goede
> ---
> drivers/gpu/drm/nouveau/nouveau_backlight.c | 7 ++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c
> b/drivers/gpu/drm/nouveau/nouveau_backlight.c
> index 40409a29f5b6..91b5ecc57538 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
> @@ -33,6 +33,7 @@
> #include
> #include
> #include
> +#include
>
> #include "nouveau_drv.h"
> #include "nouveau_reg.h"
> @@ -299,8 +300,12 @@ nv50_backlight_init(struct nouveau_backlight *bl,
> struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
> struct nvif_object *device = >client.device.object;
>
> + /*
> + * Note when this runs the connectors have not been probed yet,
> + * so nv_conn->base.status is not set yet.
> + */
> if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or)
> - 1)) ||
> - nv_conn->base.status != connector_status_connected)
> + drm_helper_probe_detect(_conn->base, NULL, false) !=
> connector_status_connected)
> return -ENODEV;
>
> if (nv_conn->type == DCB_CONNECTOR_eDP) {
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
[Nouveau] [PATCH 6.2 regression fix] drm/nouveau/kms: Fix backlight registration
The nouveau code used to call drm_fb_helper_initial_config() from
nouveau_fbcon_init() before calling drm_dev_register(). This would
probe all connectors so that drm_connector->status could be used during
backlight registration which runs from nouveau_connector_late_register().
After commit 4a16dd9d18a0 ("drm/nouveau/kms: switch to drm fbdev helpers")
the fbdev emulation code, which now is a drm-client, can only run after
drm_dev_register(). So during backlight registration the connectors are
not probed yet and the drm_connector->status == connected check in
nv50_backlight_init() would now always fail.
Replace the drm_connector->status == connected check with
a drm_helper_probe_detect() == connected check to fix nv_backlight
no longer getting registered because of this.
Fixes: 4a16dd9d18a0 ("drm/nouveau/kms: switch to drm fbdev helpers")
Link: https://gitlab.freedesktop.org/drm/nouveau/-/issues/202
Signed-off-by: Hans de Goede
---
drivers/gpu/drm/nouveau/nouveau_backlight.c | 7 ++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c
b/drivers/gpu/drm/nouveau/nouveau_backlight.c
index 40409a29f5b6..91b5ecc57538 100644
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -33,6 +33,7 @@
#include
#include
#include
+#include
#include "nouveau_drv.h"
#include "nouveau_reg.h"
@@ -299,8 +300,12 @@ nv50_backlight_init(struct nouveau_backlight *bl,
struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nvif_object *device = >client.device.object;
+ /*
+* Note when this runs the connectors have not been probed yet,
+* so nv_conn->base.status is not set yet.
+*/
if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or)
- 1)) ||
- nv_conn->base.status != connector_status_connected)
+ drm_helper_probe_detect(_conn->base, NULL, false) !=
connector_status_connected)
return -ENODEV;
if (nv_conn->type == DCB_CONNECTOR_eDP) {
--
2.39.1
