Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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=====================
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Firmware lookup order
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=====================
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Different functionality is available to enable firmware to be found.
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Below is chronological order of how firmware will be looked for once
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a driver issues a firmware API call.
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* The ''Built-in firmware'' is checked first, if the firmware is present we
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return it immediately
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* The ''Firmware cache'' is looked at next. If the firmware is found we
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return it immediately
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* The ''Direct filesystem lookup'' is performed next, if found we
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return it immediately
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* The ''Platform firmware fallback'' is performed next, but only when
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firmware_request_platform() is used, if found we return it immediately
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* If no firmware has been found and the fallback mechanism was enabled
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the sysfs interface is created. After this either a kobject uevent
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is issued or the custom firmware loading is relied upon for firmware
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loading up to the timeout value.
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