From 9e75dc61eaa9acd1bff83c3b814ac2af6dc1f64c Mon Sep 17 00:00:00 2001
From: Karol Herbst <kherbst@redhat.com>
Date: Mon, 19 Feb 2018 17:09:45 +0100
Subject: [PATCH] drm/nouveau/bl: fix backlight regression
Git-commit: 9e75dc61eaa9acd1bff83c3b814ac2af6dc1f64c
Patch-mainline: v4.16-rc6
References: bsc#1095094

Fixes: 3c66c87dc9 ("drm/nouveau/disp: remove hw-specific customisation
of output paths")

Suggested-by: Ben Skeggs <skeggsb@redhat.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/nouveau/nouveau_backlight.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -134,7 +134,7 @@ nv50_get_intensity(struct backlight_devi
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 	struct nvif_object *device = &drm->client.device.object;
-	int or = nv_encoder->or;
+	int or = ffs(nv_encoder->dcb->or) - 1;
 	u32 div = 1025;
 	u32 val;
 
@@ -149,7 +149,7 @@ nv50_set_intensity(struct backlight_devi
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 	struct nvif_object *device = &drm->client.device.object;
-	int or = nv_encoder->or;
+	int or = ffs(nv_encoder->dcb->or) - 1;
 	u32 div = 1025;
 	u32 val = (bd->props.brightness * div) / 100;
 
@@ -170,7 +170,7 @@ nva3_get_intensity(struct backlight_devi
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 	struct nvif_object *device = &drm->client.device.object;
-	int or = nv_encoder->or;
+	int or = ffs(nv_encoder->dcb->or) - 1;
 	u32 div, val;
 
 	div  = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
@@ -188,7 +188,7 @@ nva3_set_intensity(struct backlight_devi
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 	struct nvif_object *device = &drm->client.device.object;
-	int or = nv_encoder->or;
+	int or = ffs(nv_encoder->dcb->or) - 1;
 	u32 div, val;
 
 	div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
@@ -228,7 +228,7 @@ nv50_backlight_init(struct drm_connector
 			return -ENODEV;
 	}
 
-	if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
+	if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)))
 		return 0;
 
 	if (drm->client.device.info.chipset <= 0xa0 ||