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Commit db1d5bbc authored by Jordan Crouse's avatar Jordan Crouse Committed by Jeremy Gebben
Browse files

msm: kgsl: Return something when the KGSL device is read 



'cat /dev/kgsl-3d0' is the first smoke test that everybody runs when
bringing up a new GPU since it can be run without any other tools
and verifies the full power / initialization path.  Instead of just
returning -EINVAL for a read print a little message to let the user
know that indeed, the GPU is up and happy.

Change-Id: Ic0dedbadf9c8a2a926142a79802d8a340892bc3d
Signed-off-by: default avatarJordan Crouse <jcrouse@codeaurora.org>
parent 41a6cd64

drivers/gpu/msm/kgsl.c

+17 −0
Original line number Diff line number Diff line
@@ -3882,11 +3882,28 @@ static irqreturn_t kgsl_irq_handler(int irq, void *data) 


}



#define KGSL_READ_MESSAGE "OH HAI GPU"



static ssize_t kgsl_read(struct file *filep, char __user *buf, size_t count,

		loff_t *pos)

{

	int ret;



	if (*pos >= strlen(KGSL_READ_MESSAGE) + 1)

		return 0;



	ret = snprintf(buf, count, "%s\n", KGSL_READ_MESSAGE);

	*pos += ret;



	return ret;

}



static const struct file_operations kgsl_fops = {

	.owner = THIS_MODULE,

	.release = kgsl_release,

	.open = kgsl_open,

	.mmap = kgsl_mmap,

	.read = kgsl_read,

	.get_unmapped_area = kgsl_get_unmapped_area,

	.unlocked_ioctl = kgsl_ioctl,

	.compat_ioctl = kgsl_compat_ioctl,