From: Philipp Zabel Date: Thu, 10 Oct 2013 14:18:36 +0000 (+0200) Subject: staging: drm/imx: also allow to allocate only 2 DMFC slots for DP full plane X-Git-Tag: MMI-PSA29.97-13-9~13364^2~380 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a2210d578820f12190fdde4d33758a17336ab4fc;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c b/drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c index 2e97c33b81e7..98070dd8c920 100644 --- a/drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c +++ b/drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c @@ -307,13 +307,13 @@ int ipu_dmfc_alloc_bandwidth(struct dmfc_channel *dmfc, 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 */ if (dmfc->data->ipu_channel == IPUV3_CHANNEL_MEM_BG_SYNC) 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) slots *= 2; else