Messages in this thread Patches in this message | | | Date | Sat, 26 Mar 2011 15:30:02 +0300 | From | igor@novg ... | Subject | [PATCH 2.6.38.1] pata it821x: Add module param to force UDMA on Vortex86SX |
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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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