linux-kernel - [PATCH 1/2] media: mgb4: Added support for additional GMSL modules variants

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Message-ID: <20250127155957.5254-2-tumic@gpxsee.org>
Date: Mon, 27 Jan 2025 16:59:56 +0100
From: tumic@...see.org
To: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Martin Tůma <martin.tuma@...iteqautomotive.com>
Subject: [PATCH 1/2] media: mgb4: Added support for additional GMSL modules variants

From: Martin Tůma <martin.tuma@...iteqautomotive.com>

Added support for GMSL modules variants 3 and 4. Variant 3 is the same as
variant 2 from the driver's point of view. Variant 4 has "hardwired" daisy
chain loopback outputs and thus missing the v4l2 outputs.

Signed-off-by: Martin Tůma <martin.tuma@...iteqautomotive.com>
---
 drivers/media/pci/mgb4/mgb4_core.c | 13 +++++++++----
 drivers/media/pci/mgb4/mgb4_core.h |  8 ++++++--
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/media/pci/mgb4/mgb4_core.c b/drivers/media/pci/mgb4/mgb4_core.c
index 8ceaed5c1453..23bc04129827 100644
--- a/drivers/media/pci/mgb4/mgb4_core.c
+++ b/drivers/media/pci/mgb4/mgb4_core.c
@@ -406,8 +406,9 @@ static int get_module_version(struct mgb4_dev *mgbdev)
 		dev_err(dev, "unknown module type\n");
 		return -EINVAL;
 	}
-	fw_version = mgb4_read_reg(&mgbdev->video, 0xC4);
-	if (fw_version >> 24 != mgbdev->module_version >> 4) {
+	fw_version = mgb4_read_reg(&mgbdev->video, 0xC4) >> 24;
+	if ((MGB4_IS_FPDL3(mgbdev) && fw_version != 1) ||
+	    (MGB4_IS_GMSL(mgbdev) && fw_version != 2)) {
 		dev_err(dev, "module/firmware type mismatch\n");
 		return -EINVAL;
 	}
@@ -599,14 +600,18 @@ static int mgb4_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	rv = get_module_version(mgbdev);
 	if (rv < 0)
 		goto exit;
+	/* Propagate the module type(version) to the FPGA */
+	mgb4_write_reg(&mgbdev->video, 0xD4, mgbdev->module_version);
 
 	/* Video input v4l2 devices */
 	for (i = 0; i < MGB4_VIN_DEVICES; i++)
 		mgbdev->vin[i] = mgb4_vin_create(mgbdev, i);
 
 	/* Video output v4l2 devices */
-	for (i = 0; i < MGB4_VOUT_DEVICES; i++)
-		mgbdev->vout[i] = mgb4_vout_create(mgbdev, i);
+	if (MGB4_HAS_VOUT(mgbdev)) {
+		for (i = 0; i < MGB4_VOUT_DEVICES; i++)
+			mgbdev->vout[i] = mgb4_vout_create(mgbdev, i);
+	}
 
 	/* Triggers */
 	mgbdev->indio_dev = mgb4_trigger_create(mgbdev);
diff --git a/drivers/media/pci/mgb4/mgb4_core.h b/drivers/media/pci/mgb4/mgb4_core.h
index e86742d7b6c4..cc24068400a2 100644
--- a/drivers/media/pci/mgb4/mgb4_core.h
+++ b/drivers/media/pci/mgb4/mgb4_core.h
@@ -19,9 +19,13 @@
 #define MGB4_VOUT_DEVICES 2
 
 #define MGB4_IS_GMSL(mgbdev) \
-	((mgbdev)->module_version >> 4 == 2)
+	((((mgbdev)->module_version >> 4) >= 2) && \
+	 (((mgbdev)->module_version >> 4) <= 4))
 #define MGB4_IS_FPDL3(mgbdev) \
-	((mgbdev)->module_version >> 4 == 1)
+	(((mgbdev)->module_version >> 4) == 1)
+#define MGB4_HAS_VOUT(mgbdev) \
+	((((mgbdev)->module_version >> 4) >= 1) && \
+	 (((mgbdev)->module_version >> 4) <= 3))
 
 struct mgb4_dma_channel {
 	struct dma_chan *chan;
-- 
2.48.0