diff options
| author | Igor Plyatov <plyatov@gmail.com> | 2011-03-28 16:56:15 +0400 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2011-04-24 11:34:06 -0400 |
| commit | 9719b8f5bc35664a23de1ddfbc85217398af0df8 (patch) | |
| tree | 5986b2a7bf9b990f92c3c11e10d37c3eb8d45d1a /drivers/ata | |
| parent | 181e3ceaba761d35d96d791d5031b1e51abec46c (diff) | |
ata: pata_at91.c bugfix for high master clock
The AT91SAM9 microcontrollers with master clock higher then 105 MHz
and PIO0, have overflow of the NCS_RD_PULSE value in the MSB. This
lead to "NCS_RD_PULSE" pulse longer then "NRD_CYCLE" pulse and driver
does not detect ATA device.
Signed-off-by: Igor Plyatov <plyatov@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/pata_at91.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/ata/pata_at91.c b/drivers/ata/pata_at91.c index 0da0dcc7dd08..a9a066a18ccf 100644 --- a/drivers/ata/pata_at91.c +++ b/drivers/ata/pata_at91.c @@ -33,11 +33,12 @@ #define DRV_NAME "pata_at91" -#define DRV_VERSION "0.1" +#define DRV_VERSION "0.2" #define CF_IDE_OFFSET 0x00c00000 #define CF_ALT_IDE_OFFSET 0x00e00000 #define CF_IDE_RES_SIZE 0x08 +#define NCS_RD_PULSE_LIMIT 0x3f /* maximal value for pulse bitfields */ struct at91_ide_info { unsigned long mode; @@ -109,6 +110,11 @@ static void set_smc_timing(struct device *dev, /* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */ ncs_read_setup = 1; ncs_read_pulse = read_cycle - 2; + if (ncs_read_pulse > NCS_RD_PULSE_LIMIT) { + ncs_read_pulse = NCS_RD_PULSE_LIMIT; + dev_warn(dev, "ncs_read_pulse limited to maximal value %lu\n", + ncs_read_pulse); + } /* Write timings same as read timings */ write_cycle = read_cycle; |