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[4/4] cx23885: Override 888 ImpactVCBe crystal frequency

Message ID 1520363737-25724-5-git-send-email-brad@nextdimension.cc (mailing list archive)
State New, archived
Headers show

Commit Message

Brad Love March 6, 2018, 7:15 p.m. UTC 
Hauppauge produced a revision of ImpactVCBe using an 888,
with a 25MHz crystal, instead of using the default third
overtone 50Mhz crystal. This overrides that frequency so
that the cx25840 is properly configured. Without the proper
crystal setup the cx25840 cannot load the firmware or
decode video.

Signed-off-by: Brad Love <brad@nextdimension.cc>
---
 drivers/media/pci/cx23885/cx23885-core.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox

Patch

diff --git a/drivers/media/pci/cx23885/cx23885-core.c b/drivers/media/pci/cx23885/cx23885-core.c
index 2c76a02..ff369e9 100644
--- a/drivers/media/pci/cx23885/cx23885-core.c
+++ b/drivers/media/pci/cx23885/cx23885-core.c
@@ -881,6 +881,16 @@  static int cx23885_dev_setup(struct cx23885_dev *dev)
 	if (cx23885_boards[dev->board].clk_freq > 0)
 		dev->clk_freq = cx23885_boards[dev->board].clk_freq;
 
+	if (dev->board == CX23885_BOARD_HAUPPAUGE_IMPACTVCBE &&
+		dev->pci->subsystem_device == 0x7137) {
+		/* Hauppauge ImpactVCBe device ID 0x7137 is populated
+		 * with an 888, and a 25Mhz crystal, instead of the
+		 * usual third overtone 50Mhz. The default clock rate must
+		 * be overridden so the cx25840 is properly configured
+		 */
+		dev->clk_freq = 25000000;
+	}
+
 	dev->pci_bus  = dev->pci->bus->number;
 	dev->pci_slot = PCI_SLOT(dev->pci->devfn);
 	cx23885_irq_add(dev, 0x001f00);