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

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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>
This commit is contained in:
Daniel González Cabanelas 2022-02-20 19:19:50 +01:00 • committed by Hans Verkuil
parent ee8b887329
commit 56cb61f70e
1 changed files with 3 additions and 0 deletions
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3
drivers/media/pci/cx88/cx88-mpeg.c
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@ -162,6 +162,9 @@ 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);