Hi Philipp, On 10/10/2013 10:18 PM, Philipp Zabel wrote: > 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@xxxxxxxxxxxxxx> > --- > drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c b/drivers/staging/imx-drm/ipu-v3/ipu-dmfc.c > index 2e97c33..98070dd 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) */ The commit message mentions that the size of 2 slots is 128*128-bit, that is, 128*16-byte. This contradicts the above annotation(128*4 bytes (2 slots)). > + slots = 2; > + > if (segment >= 0) > slots *= 2; > else > Regards, Liu Ying _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
