linux-kernel - [PATCH 1/3] drm/nouveau/clk: make therm and volt devices optional

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Date:	Thu, 10 Jul 2014 16:34:35 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Ben Skeggs <bskeggs@...hat.com>
CC:	<nouveau@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<gnurou@...il.com>, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH 1/3] drm/nouveau/clk: make therm and volt devices optional

Allow the clock subsystem to operate even if voltage and thermal devices
are not set for the device (for people with watercooling! ;))

Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 36 +++++++++++++++---------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c
index 22351f594d2a..63b314a033cb 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c
@@ -90,16 +90,20 @@ nouveau_cstate_prog(struct nouveau_clock *clk,
 		cstate = &pstate->base;
 	}
 
-	ret = nouveau_therm_cstate(ptherm, pstate->fanspeed, +1);
-	if (ret && ret != -ENODEV) {
-		nv_error(clk, "failed to raise fan speed: %d\n", ret);
-		return ret;
+	if (ptherm) {
+		ret = nouveau_therm_cstate(ptherm, pstate->fanspeed, +1);
+		if (ret && ret != -ENODEV) {
+			nv_error(clk, "failed to raise fan speed: %d\n", ret);
+			return ret;
+		}
 	}
 
-	ret = volt->set_id(volt, cstate->voltage, +1);
-	if (ret && ret != -ENODEV) {
-		nv_error(clk, "failed to raise voltage: %d\n", ret);
-		return ret;
+	if (volt) {
+		ret = volt->set_id(volt, cstate->voltage, +1);
+		if (ret && ret != -ENODEV) {
+			nv_error(clk, "failed to raise voltage: %d\n", ret);
+			return ret;
+		}
 	}
 
 	ret = clk->calc(clk, cstate);
@@ -108,13 +112,17 @@ nouveau_cstate_prog(struct nouveau_clock *clk,
 		clk->tidy(clk);
 	}
 
-	ret = volt->set_id(volt, cstate->voltage, -1);
-	if (ret && ret != -ENODEV)
-		nv_error(clk, "failed to lower voltage: %d\n", ret);
+	if (volt) {
+		ret = volt->set_id(volt, cstate->voltage, -1);
+		if (ret && ret != -ENODEV)
+			nv_error(clk, "failed to lower voltage: %d\n", ret);
+	}
 
-	ret = nouveau_therm_cstate(ptherm, pstate->fanspeed, -1);
-	if (ret && ret != -ENODEV)
-		nv_error(clk, "failed to lower fan speed: %d\n", ret);
+	if (ptherm) {
+		ret = nouveau_therm_cstate(ptherm, pstate->fanspeed, -1);
+		if (ret && ret != -ENODEV)
+			nv_error(clk, "failed to lower fan speed: %d\n", ret);
+	}
 
 	return 0;
 }
-- 
2.0.0

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