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gpu: ipu-v3: Allow channel burst locking on i.MX6 only 

The IDMAC_LOCK_EN registers on i.MX51 have a different layout, and on
i.MX53 enabling the lock feature causes bursts to get lost. Restrict
enabling the burst lock feature to i.MX6.

Reported-by: Patrick Brünn <P.Bruenn@beckhoff.com>
Fixes: 790cb4c7c9 ("drm/imx: lock scanout transfers for consecutive bursts")
Tested-by: Patrick Brünn <P.Bruenn@beckhoff.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Philipp Zabel 2017-10-10 15:13:55 +02:00
parent 8a5776a5f4
commit cda7755644
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/ipu-v3/ipu-common.c
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@ -405,6 +405,14 @@ int ipu_idmac_lock_enable(struct ipuv3_channel *channel, int num_bursts)
return -EINVAL;
}
/*
* IPUv3EX / i.MX51 has a different register layout, and on IPUv3M /
* i.MX53 channel arbitration locking doesn't seem to work properly.
* Allow enabling the lock feature on IPUv3H / i.MX6 only.
*/
if (bursts && ipu->ipu_type != IPUV3H)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(idmac_lock_en_info); i++) {
if (channel->num == idmac_lock_en_info[i].chnum)
break;