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| author | Feng Tang <feng.tang@intel.com> | 2019-02-13 08:47:36 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-14 10:51:39 +0100 |
| commit | 1ea61b68d0f8685775c897c2de040c73b8d1c56a (patch) | |
| tree | db5267e71273bd1ed8d011593b29ff07215876bd /Documentation/admin-guide | |
| parent | driver core: Fix possible supplier PM-usage counter imbalance (diff) | |
| download | linux-1ea61b68d0f8685775c897c2de040c73b8d1c56a.tar.xz linux-1ea61b68d0f8685775c897c2de040c73b8d1c56a.zip | |
async: Add cmdline option to specify drivers to be async probed
Asynchronous driver probing can help much on kernel fastboot, and
this option can provide a flexible way to optimize and quickly verify
async driver probe.
Also it will help in below cases:
* Some driver actually covers several families of HWs, some of which
could use async probing while others don't. So we can't simply
turn on the PROBE_PREFER_ASYNCHRONOUS flag in driver, but use this
cmdline option, like igb driver async patch discussed at
https://www.spinics.net/lists/netdev/msg545986.html
* For SOC (System on Chip) with multiple spi or i2c controllers, most
of the slave spi/i2c devices will be assigned with fixed controller
number, while async probing may make those controllers get different
index for each boot, which prevents those controller drivers to be
async probed. For platforms not using these spi/i2c slave devices,
they can use this cmdline option to benefit from the async probing.
Suggested-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 858b6c0b9a15..dba164bbcc1a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -910,6 +910,10 @@ The filter can be disabled or changed to another driver later using sysfs. + driver_async_probe= [KNL] + List of driver names to be probed asynchronously. + Format: <driver_name1>,<driver_name2>... + drm.edid_firmware=[<connector>:]<file>[,[<connector>:]<file>] Broken monitors, graphic adapters, KVMs and EDIDless panels may send no or incorrect EDID data sets. |