lkml.org 
[lkml]   [2019]   [May]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v5 1/6] drm: panfrost: add optional bus_clock
Date
Allwinner H6 has an ARM Mali-T720 MP2 which required a bus_clock.

Add an optional bus_clock at the init of the panfrost driver.

Signed-off-by: Clément Péron <peron.clem@gmail.com>
---
drivers/gpu/drm/panfrost/panfrost_device.c | 25 +++++++++++++++++++++-
drivers/gpu/drm/panfrost/panfrost_device.h | 1 +
2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index 3b2bced1b015..8da6e612d384 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -44,7 +44,8 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)

pfdev->clock = devm_clk_get(pfdev->dev, NULL);
if (IS_ERR(pfdev->clock)) {
- dev_err(pfdev->dev, "get clock failed %ld\n", PTR_ERR(pfdev->clock));
+ dev_err(pfdev->dev, "get clock failed %ld\n",
+ PTR_ERR(pfdev->clock));
return PTR_ERR(pfdev->clock);
}

@@ -55,11 +56,33 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)
if (err)
return err;

+ pfdev->bus_clock = devm_clk_get_optional(pfdev->dev, "bus");
+ if (IS_ERR(pfdev->bus_clock)) {
+ dev_err(pfdev->dev, "get bus_clock failed %ld\n",
+ PTR_ERR(pfdev->bus_clock));
+ return PTR_ERR(pfdev->bus_clock);
+ }
+
+ if (pfdev->bus_clock) {
+ rate = clk_get_rate(pfdev->bus_clock);
+ dev_info(pfdev->dev, "bus_clock rate = %lu\n", rate);
+
+ err = clk_prepare_enable(pfdev->bus_clock);
+ if (err)
+ goto disable_clock;
+ }
+
return 0;
+
+disable_clock:
+ clk_disable_unprepare(pfdev->clock);
+
+ return err;
}

static void panfrost_clk_fini(struct panfrost_device *pfdev)
{
+ clk_disable_unprepare(pfdev->bus_clock);
clk_disable_unprepare(pfdev->clock);
}

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 56f452dfb490..8074f221034b 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -66,6 +66,7 @@ struct panfrost_device {

void __iomem *iomem;
struct clk *clock;
+ struct clk *bus_clock;
struct regulator *regulator;
struct reset_control *rstc;

--
2.17.1
\
 
 \ /
  Last update: 2019-05-17 20:48    [W:0.043 / U:3.224 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site