Commit d02a4b55 authored Feb 20, 2022 by Daniel González Cabanelas Committed by Greg Kroah-Hartman Apr 20, 2022

media: cx88-mpeg: clear interrupt status register before streaming video



[ Upstream commit 56cb61f70e547e1b0cdfe6ff5a1f1ce6242e6d96 ]

Some cx88 video cards may have transport stream status interrupts set
to 1 from cold start, causing errors like this:

  cx88xx: cx88_print_irqbits: core:irq mpeg  [0x100000] ts_err?*
  cx8802: cx8802_mpeg_irq: mpeg:general errors: 0x00100000

According to CX2388x datasheet, the interrupt status register should be
cleared before enabling IRQs to stream video.

Fix it by clearing the Transport Stream Interrupt Status register.

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent dbde6c30

drivers/media/pci/cx88/cx88-mpeg.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -175,6 +175,9 @@ int cx8802_start_dma(struct cx8802_dev *dev,
		cx_write(MO_TS_GPCNTRL, GP_COUNT_CONTROL_RESET);
		q->count = 0;

		/* clear interrupt status register */
		cx_write(MO_TS_INTSTAT, 0x1f1111);

		/* enable irqs */
		dprintk( 1, "setting the interrupt mask\n" );
		cx_set(MO_PCI_INTMSK, core->pci_irqmask \| PCI_INT_TSINT);