[PATCH v4 5/6] platform/raspberrypi: vchiq-mmal: Support sending data to MMAL ports
From: Jai Luthra <jai.luthra@ideasonboard.com>
Date: 2026-09-16 14:26:47
Also in:
linux-media, lkml
Subsystem:
broadcom bcm2711/bcm2835 arm architecture, the rest · Maintainers:
Florian Fainelli, Linus Torvalds
From: Dave Stevenson <dave.stevenson@raspberrypi.com> Add the ability to send data to ports. This only supports zero copy mode as the required bulk transfer setup calls are not done. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com> --- drivers/platform/raspberrypi/vchiq-mmal/mmal-vchiq.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/platform/raspberrypi/vchiq-mmal/mmal-vchiq.c b/drivers/platform/raspberrypi/vchiq-mmal/mmal-vchiq.c
index a64b5175e1a9..ccd8910c315f 100644
--- a/drivers/platform/raspberrypi/vchiq-mmal/mmal-vchiq.c
+++ b/drivers/platform/raspberrypi/vchiq-mmal/mmal-vchiq.c@@ -430,11 +430,19 @@ buffer_from_host(struct vchiq_mmal_instance *instance, (u32)(unsigned long)buf->buffer; m.u.buffer_from_host.buffer_header.alloc_size = buf->buffer_size; - m.u.buffer_from_host.buffer_header.length = 0; /* nothing used yet */ - m.u.buffer_from_host.buffer_header.offset = 0; /* no offset */ - m.u.buffer_from_host.buffer_header.flags = 0; /* no flags */ - m.u.buffer_from_host.buffer_header.pts = MMAL_TIME_UNKNOWN; - m.u.buffer_from_host.buffer_header.dts = MMAL_TIME_UNKNOWN; + if (port->type == MMAL_PORT_TYPE_OUTPUT) { + m.u.buffer_from_host.buffer_header.length = 0; + m.u.buffer_from_host.buffer_header.offset = 0; + m.u.buffer_from_host.buffer_header.flags = 0; + m.u.buffer_from_host.buffer_header.pts = MMAL_TIME_UNKNOWN; + m.u.buffer_from_host.buffer_header.dts = MMAL_TIME_UNKNOWN; + } else { + m.u.buffer_from_host.buffer_header.length = buf->length; + m.u.buffer_from_host.buffer_header.offset = 0; + m.u.buffer_from_host.buffer_header.flags = buf->mmal_flags; + m.u.buffer_from_host.buffer_header.pts = buf->pts; + m.u.buffer_from_host.buffer_header.dts = buf->dts; + } /* clear buffer type specific data */ memset(&m.u.buffer_from_host.buffer_header_type_specific, 0,
--
2.55.0