From de2bc45c84f7f0c5b0be441c998035b70cbe4614 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Thu, 26 Oct 2017 02:27:51 -0400
Subject: [PATCH] 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>
---
drivers/media/platform/vsp1/vsp1_lif.c | 29 ++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/drivers/media/platform/vsp1/vsp1_lif.c b/drivers/media/platform/vsp1/vsp1_lif.c
index 0cb63244b21af..0b18f0bd74199 100644
--- a/drivers/media/platform/vsp1/vsp1_lif.c
+++ b/drivers/media/platform/vsp1/vsp1_lif.c
@@ -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) |
--
2.30.2