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media: vsp1: Update LIF buffer thresholds 

The LIF module has a data buffer to accommodate clock rate differences
between the DU and the VSP. Several programmable threshold values
control DU start of frame notification by the VSP and VSP clock
stop/resume. The R-Car Gen2 and Gen3 datasheets recommend values for the
different SoCs. Update the driver to use the recommended values for
optimal operation.

Based on a BSP patch from Koji Matsuoka <koji.matsuoka.xm@renesas.com>,
with Gen2 and V3H/V3M updates.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Laurent Pinchart 2017-10-26 02:27:51 -04:00 committed by Mauro Carvalho Chehab
parent 5eea860a6f
commit de2bc45c84
1 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/media/platform/vsp1/vsp1_lif.c
View File

@ -88,14 +88,35 @@ static void lif_configure_stream(struct vsp1_entity *entity,
{
const struct v4l2_mbus_framefmt *format;
struct vsp1_lif *lif = to_lif(&entity->subdev);
unsigned int hbth = 1300;
unsigned int obth = 400;
unsigned int lbth = 200;
unsigned int hbth;
unsigned int obth;
unsigned int lbth;
format = vsp1_entity_get_pad_format(&lif->entity, lif->entity.config,
LIF_PAD_SOURCE);
obth = min(obth, (format->width + 1) / 2 * format->height - 4);
switch (entity->vsp1->version & VI6_IP_VERSION_SOC_MASK) {
case VI6_IP_VERSION_MODEL_VSPD_GEN2:
case VI6_IP_VERSION_MODEL_VSPD_V2H:
hbth = 1536;
obth = min(128U, (format->width + 1) / 2 * format->height - 4);
lbth = 1520;
break;
case VI6_IP_VERSION_MODEL_VSPDL_GEN3:
case VI6_IP_VERSION_MODEL_VSPD_V3:
hbth = 0;
obth = 1500;
lbth = 0;
break;
case VI6_IP_VERSION_MODEL_VSPD_GEN3:
default:
hbth = 0;
obth = 3000;
lbth = 0;
break;
}
vsp1_lif_write(lif, dlb, VI6_LIF_CSBTH,
(hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |