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Message-Id: <20220418121203.653850945@linuxfoundation.org>
Date: Mon, 18 Apr 2022 14:13:28 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Daniel González Cabanelas <dgcbueu@...il.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 142/218] media: cx88-mpeg: clear interrupt status register before streaming video
From: Daniel González Cabanelas <dgcbueu@...il.com>
[ 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@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/media/pci/cx88/cx88-mpeg.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/media/pci/cx88/cx88-mpeg.c b/drivers/media/pci/cx88/cx88-mpeg.c
index 245357adbc25..37d4512f3eb8 100644
--- a/drivers/media/pci/cx88/cx88-mpeg.c
+++ b/drivers/media/pci/cx88/cx88-mpeg.c
@@ -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);
--
2.34.1
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