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Merge branch 'canoscan_n650u_plustek_usb_workaround' into 'master' 

[plustek] Add 1ms delay before writing to register 0x59 during reseting registers

Closes #137

See merge request sane-project/backends!535
merge-requests/540/head
Gerhard Jäger 2020-10-12 09:14:04 +00:00
rodzic 7e6231fe57 6af85ec669
commit 7f38f0f71c
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backend/plustek-usbhw.c
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@ -1451,6 +1451,14 @@ usb_ResetRegisters( Plustek_Device *dev )
* CanoScan devices to work properly after power-up
*/
sanei_lm983x_write_byte( dev->fd, 0x5b, regs[0x5b] );
/* At least CanoScan N650U can have a problem with writing
* to register 0x59 due XHCI USB controller is too
* fast for him. Simulate EHCI USB controller's
* behavior here - wait 1ms.
*/
usleep(1000);
sanei_lm983x_write_byte( dev->fd, 0x59, regs[0x59] );
sanei_lm983x_write_byte( dev->fd, 0x5a, regs[0x5a] );
} else {