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parport: fix ieee1284_epp_read_addr

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We bought cheap notebooks to control our custom data acquisition system, which
requires EPP mode (read/write, data/addr).  The bios does not offer EPP mode,
and indeed hardware EPP mode appears not to work, although the parport driver
tries to use it.  EPPSWE mode does work for data r/w and addr write, but addr
read requires this patch.

(stephan)rshgse3: lspci

00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS/940GML and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02)
00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7 Family) Serial ATA Storage Controller AHCI (rev 02)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02)
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8055 PCI-E Gigabit Ethernet Controller (rev 12)
05:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02)
08:03.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b3)
08:03.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C552 IEEE 1394 Controller (rev 08)
08:03.2 Generic system peripheral [0805]: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 17)

(stephan)rshgse3: grep . /proc/sys/dev/parport/parport0/*

/proc/sys/dev/parport/parport0/base-addr:888    1912
/proc/sys/dev/parport/parport0/dma:-1
/proc/sys/dev/parport/parport0/irq:7
/proc/sys/dev/parport/parport0/modes:PCSPP,TRISTATE,EPP
/proc/sys/dev/parport/parport0/spintime:500

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stephan Boettcher 2008-02-08 04:20:56 -08:00 committed by Linus Torvalds
parent a36219ac93
commit 13050d8901
1 changed files with 1 additions and 1 deletions
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2
drivers/parport/ieee1284_ops.c
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@ -888,7 +888,7 @@ size_t parport_ieee1284_epp_read_addr (struct parport *port,
/* Event 59: set nSelectIn (nAStrb) high */
parport_frob_control (port, PARPORT_CONTROL_SELECT,
PARPORT_CONTROL_SELECT);
0);
/* Event 60: wait for Busy to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,