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Subject[PATCH 2.6.38.1] pata it821x: Add module param to force UDMA on Vortex86SX
 This patch adds parameter 'it8212_rdc11_force_udma' to 'pata_it821x' 
module,
which allows users to force UDMA mode on RDC11/Vortex86SX embedded
devices.

---
UDMA is disabled by default due to some CRC errors, which i cannot
observe when
using CompactFlash card with patched driver.

May be there are errors with pure IDE devices or with older revisions
of Vortex86SX
boards, i do no know. But for my device i have 2x improvement in I/O
speed when
enabling UDMA/33 instead of MWDMA, so i think this parameter would be
useful.

Also fix to initialize default value for parameter 'noraid'.

--- b/drivers/ata/pata_it821x.c 2011-03-23 23:04:47.000000000 +0300
+++ a/drivers/ata/pata_it821x.c 2011-03-26 15:10:49.608952573 +0300
@@ -111,7 +111,8 @@ struct it821x_dev
* device.
*/

-static int it8212_noraid;
+static int it8212_noraid = 0;
+static int it8212_rdc11_force_udma = 0;
/**
* it821x_program - program the PIO/MWDMA registers
@@ -913,7 +914,7 @@ static int it821x_init_one(struct pci_de

if (pdev->vendor == PCI_VENDOR_ID_RDC) {
/* Deal with Vortex86SX */
- if (pdev->revision == 0x11)
+ if (pdev->revision == 0x11 && !it8212_rdc11_force_udma)
ppi[0] = &info_rdc_11;
else
ppi[0] = &info_rdc;
@@ -988,9 +989,12 @@ MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, it821x);
MODULE_VERSION(DRV_VERSION);

-
module_param_named(noraid, it8212_noraid, int, S_IRUGO);
MODULE_PARM_DESC(noraid, "Force card into bypass mode");

+module_param_named(rdc11_force_udma, it8212_rdc11_force_udma, int,
S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(rdc11_force_udma, "Force enable UDMA mode
RDC11/Vortex86SX boards."
+ " Use with caution");
+
module_init(it821x_init);
module_exit(it821x_exit);


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