linux-kernel - [PATCH v2 5/6] platform/raspberrypi: vchiq-mmal: Support sending data to MMAL ports

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Message-Id: <20260105-b4-vc-sm-cma-v2-5-4daea749ced9@ideasonboard.com>
Date: Mon, 05 Jan 2026 14:26:51 +0530
From: Jai Luthra <jai.luthra@...asonboard.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>, 
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>, 
 bcm-kernel-feedback-list@...adcom.com, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>
Cc: Phil Elwell <phil@...pberrypi.com>, Stefan Wahren <wahrenst@....net>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Kieran Bingham <kieran.bingham@...asonboard.com>, 
 Sumit Semwal <sumit.semwal@...aro.org>, 
 Christian König <christian.koenig@....com>, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-rpi-kernel@...ts.infradead.org, 
 Jai Luthra <jai.luthra@...asonboard.com>, 
 Dave Stevenson <dave.stevenson@...pberrypi.org>
Subject: [PATCH v2 5/6] platform/raspberrypi: vchiq-mmal: Support sending
 data to MMAL ports

From: Dave Stevenson <dave.stevenson@...pberrypi.org>

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@...pberrypi.org>
Signed-off-by: Jai Luthra <jai.luthra@...asonboard.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 fe6fb571b745e04545d2d7fe7f37a486792d398f..a228098d8cc0af5d5900b92b2847a1626a6d599c 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,

-- 
2.52.0