linux-kernel - [PATCH nouveau 06/11] platform: complete the power up/down sequence

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Date:	Tue, 23 Dec 2014 18:39:59 +0800
From:	Vince Hsu <vinceh@...dia.com>
To:	thierry.reding@...il.com, swarren@...dotorg.org, gnurou@...il.com,
	bskeggs@...hat.com, martin.peres@...e.fr, seven@...rod-online.com,
	samuel.pitoiset@...il.com
CC:	nouveau@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, Vince Hsu <vinceh@...dia.com>
Subject: [PATCH nouveau 06/11] platform: complete the power up/down sequence

This patch adds some missing pieces of the rail gaing/ungating sequence that
can improve the stability in theory.

Signed-off-by: Vince Hsu <vinceh@...dia.com>
---
 drm/nouveau_platform.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 drm/nouveau_platform.h |  3 +++
 2 files changed, 45 insertions(+)

diff --git a/drm/nouveau_platform.c b/drm/nouveau_platform.c
index 68788b17a45c..527fe2358fc9 100644
--- a/drm/nouveau_platform.c
+++ b/drm/nouveau_platform.c
@@ -25,9 +25,11 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/reset.h>
 #include <linux/regulator/consumer.h>
 #include <soc/tegra/fuse.h>
+#include <soc/tegra/mc.h>
 #include <soc/tegra/pmc.h>
 
 #include "nouveau_drm.h"
@@ -61,6 +63,9 @@ static int nouveau_platform_power_up(struct nouveau_platform_gpu *gpu)
 	reset_control_deassert(gpu->rst);
 	udelay(10);
 
+	tegra_mc_flush(gpu->mc, gpu->swgroup, false);
+	udelay(10);
+
 	return 0;
 
 err_clamp:
@@ -77,6 +82,14 @@ static int nouveau_platform_power_down(struct nouveau_platform_gpu *gpu)
 {
 	int err;
 
+	tegra_mc_flush(gpu->mc, gpu->swgroup, true);
+	udelay(10);
+
+	err = tegra_powergate_gpu_set_clamping(true);
+	if (err)
+		return err;
+	udelay(10);
+
 	reset_control_assert(gpu->rst);
 	udelay(10);
 
@@ -91,6 +104,31 @@ static int nouveau_platform_power_down(struct nouveau_platform_gpu *gpu)
 	return 0;
 }
 
+static int nouveau_platform_get_mc(struct device *dev,
+		struct tegra_mc **mc, unsigned int *swgroup)
+{
+	struct of_phandle_args args;
+	struct platform_device *pdev;
+	int ret;
+
+	ret = of_parse_phandle_with_fixed_args(dev->of_node, "mc",
+				1, 0, &args);
+	if (ret)
+		return ret;
+
+	pdev = of_find_device_by_node(args.np);
+	if (!pdev)
+		return -EINVAL;
+
+	*mc = platform_get_drvdata(pdev);
+	if (!*mc)
+		return -EINVAL;
+
+	*swgroup = args.args[0];
+
+	return 0;
+}
+
 static int nouveau_platform_probe(struct platform_device *pdev)
 {
 	struct nouveau_platform_gpu *gpu;
@@ -118,6 +156,10 @@ static int nouveau_platform_probe(struct platform_device *pdev)
 	if (IS_ERR(gpu->clk_pwr))
 		return PTR_ERR(gpu->clk_pwr);
 
+	err = nouveau_platform_get_mc(&pdev->dev, &gpu->mc, &gpu->swgroup);
+	if (err)
+		return err;
+
 	err = nouveau_platform_power_up(gpu);
 	if (err)
 		return err;
diff --git a/drm/nouveau_platform.h b/drm/nouveau_platform.h
index 58c28b5653d5..969dbddd786d 100644
--- a/drm/nouveau_platform.h
+++ b/drm/nouveau_platform.h
@@ -35,6 +35,9 @@ struct nouveau_platform_gpu {
 	struct clk *clk_pwr;
 
 	struct regulator *vdd;
+
+	struct tegra_mc *mc;
+	unsigned int swgroup;
 };
 
 struct nouveau_platform_device {
-- 
1.9.1

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