diff options
| author | Jon Medhurst <tixy@linaro.org> | 2015-09-08 19:08:43 +0100 |
|---|---|---|
| committer | Ryan Harkin <ryan.harkin@linaro.org> | 2017-07-13 21:00:28 +0100 |
| commit | e27543e885fbd1cea22604653e9942f587697ef4 (patch) | |
| tree | 5cf886afbd236b5e781f6e5149e29f84c23720b4 | |
| parent | 1714e2a9840dbad9e824c58c28a6ddda3b48af25 (diff) | |
drm: hdlcd: Make sure hardware is in a safe reset state at startup
If hardware is already initialised (e.g. by UEFI) then that seems to
cause us problems.
Signed-off-by: Jon Medhurst <tixy@linaro.org>
| -rw-r--r-- | drivers/gpu/drm/arm/hdlcd_drv.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c index 6a61902e5795..51cbd540e5b7 100644 --- a/drivers/gpu/drm/arm/hdlcd_drv.c +++ b/drivers/gpu/drm/arm/hdlcd_drv.c @@ -67,6 +67,12 @@ static int hdlcd_load(struct drm_device *drm, unsigned long flags) (version & HDLCD_VERSION_MAJOR_MASK) >> 8, version & HDLCD_VERSION_MINOR_MASK); + /* Make sure hardware is in a safe reset state */ + hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 0); + hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, 0); + hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR,~0); + hdlcd_write(hdlcd, HDLCD_REG_INT_RAWSTAT, 0); + /* Get the optional framebuffer memory resource */ ret = of_reserved_mem_device_init(drm->dev); if (ret && ret != -ENODEV) |