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staging: drm/imx: also allow to allocate only 2 DMFC slots for DP full plane 

Connecting a 320x240 parallel display on i.MX6 resulted in an invalid DRDY
signal because the DC would not receive NL/EOL events on every line.
Reducing the allocated DMFC space from 4 slots (256 * 128-bit) to 2 slots
(128 * 128-bit) solved the problem.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Philipp Zabel 2013-10-10 16:18:36 +02:00 committed by Greg Kroah-Hartman
parent c35d6a37bd
commit a2210d5788
1 changed files with 4 additions and 4 deletions
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8
drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c
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@ -307,13 +307,13 @@ int ipu_dmfc_alloc_bandwidth(struct dmfc_channel *dmfc,
goto out; goto out;
} }
/* Always allocate at least 128*4 bytes (2 slots) */
if (slots < 2)
slots = 2;
/* For the MEM_BG channel, first try to allocate twice the slots */ /* For the MEM_BG channel, first try to allocate twice the slots */
if (dmfc->data->ipu_channel == IPUV3_CHANNEL_MEM_BG_SYNC) if (dmfc->data->ipu_channel == IPUV3_CHANNEL_MEM_BG_SYNC)
segment = dmfc_find_slots(priv, slots * 2); segment = dmfc_find_slots(priv, slots * 2);
else if (slots < 2)
/* Always allocate at least 128*4 bytes (2 slots) */
slots = 2;
if (segment >= 0) if (segment >= 0)
slots *= 2; slots *= 2;
else else