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Commit de2bc45c authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Mauro Carvalho Chehab
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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: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent 5eea860a

drivers/media/platform/vsp1/vsp1_lif.c

+25 −4
Original line number Diff line number Diff line
@@ -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) |