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media: cx23885: add simple suspend/resume

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After suspend-to-memory or suspend-to-disk, additional chips are no longer
reachable via i2c. Trying to tune to DVB-C on a cx23885 based
Hauppauge WinTV-HVR-4400-HD:

  si2165 8-0064: could not set chip_mode
  tda18271: performing RF tracking filter calibration

This patch implements the simplest possible suspend/resume that is
enough to tune to dvb-c channel after resume.
Afterwards dmesg looks like this:

  si2165 8-0064: downloading firmware from file 'dvb-demod-si2165.fw' \
    size=5768
  si2165 8-0064: si2165_upload_firmware: extracted patch_version=0x9a, \
    block_count=0x27, crc_expected=0xcc0a
  si2165 8-0064: fw load finished
  tda18271: performing RF tracking filter calibration
  tda18271: RF tracking filter calibration complete

Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
This commit is contained in:
Matthias Schwarzott
2024-12-31 10:37:25 +01:00
committed by Hans Verkuil
parent 1a9dbb4b3d
commit 88a7400c41
1 changed files with 29 additions and 4 deletions
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33
drivers/media/pci/cx23885/cx23885-core.c
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@@ -2231,6 +2231,28 @@ static void cx23885_finidev(struct pci_dev *pci_dev)
kfree(dev);
}
static int __maybe_unused cx23885_suspend(struct device *dev_d)
{
struct pci_dev *pci_dev = to_pci_dev(dev_d);
struct v4l2_device *v4l2_dev = pci_get_drvdata(pci_dev);
struct cx23885_dev *dev = to_cx23885(v4l2_dev);
cx23885_shutdown(dev);
return 0;
}
static int __maybe_unused cx23885_resume(struct device *dev_d)
{
struct pci_dev *pci_dev = to_pci_dev(dev_d);
struct v4l2_device *v4l2_dev = pci_get_drvdata(pci_dev);
struct cx23885_dev *dev = to_cx23885(v4l2_dev);
cx23885_reset(dev);
return 0;
}
static const struct pci_device_id cx23885_pci_tbl[] = {
{
/* CX23885 */
@@ -2250,11 +2272,14 @@ static const struct pci_device_id cx23885_pci_tbl[] = {
};
MODULE_DEVICE_TABLE(pci, cx23885_pci_tbl);
static SIMPLE_DEV_PM_OPS(cx23885_pm_ops, cx23885_suspend, cx23885_resume);
static struct pci_driver cx23885_pci_driver = {
.name = "cx23885",
.id_table = cx23885_pci_tbl,
.probe = cx23885_initdev,
.remove = cx23885_finidev,
.name = "cx23885",
.id_table = cx23885_pci_tbl,
.probe = cx23885_initdev,
.remove = cx23885_finidev,
.driver.pm = &cx23885_pm_ops,
};
static int __init cx23885_init(void)