From 1ea61b68d0f8685775c897c2de040c73b8d1c56a Mon Sep 17 00:00:00 2001 From: Feng Tang Date: Wed, 13 Feb 2019 15:47:36 +0800 Subject: 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 Cc: Randy Dunlap Signed-off-by: Feng Tang Signed-off-by: Greg Kroah-Hartman --- Documentation/admin-guide/kernel-parameters.txt | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/admin-guide') 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: ,... + drm.edid_firmware=[:][,[:]] Broken monitors, graphic adapters, KVMs and EDIDless panels may send no or incorrect EDID data sets. -- cgit v1.2.3