This is a note to let you know that I've just added the patch titled
media: cx88-mpeg: clear interrupt status register before streaming video
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-cx88-mpeg-clear-interrupt-status-register-befo.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 90692a8693a9c476ae30c06ced577211eff3c3c0
Author: Daniel González Cabanelas <dgcbueu@xxxxxxxxx>
Date: Sun Feb 20 19:19:50 2022 +0100
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@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/pci/cx88/cx88-mpeg.c b/drivers/media/pci/cx88/cx88-mpeg.c
index 680e1e3fe89b..2c1d5137ac47 100644
--- a/drivers/media/pci/cx88/cx88-mpeg.c
+++ b/drivers/media/pci/cx88/cx88-mpeg.c
@@ -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);
