From c9ef59ff01b6bd1c7360a64fcc8556a1193c2ed0 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Mon, 15 Jun 2009 18:52:53 +0200 Subject: ide: IORDY handling fixes Add ide_pio_need_iordy() helper and convert host drivers to use it. This fixes it8172, it8213, pdc202xx_old, piix, slc90e66 and siimage host drivers to handle IORDY correctly. Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/ide-xfer-mode.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/ide/ide-xfer-mode.c') diff --git a/drivers/ide/ide-xfer-mode.c b/drivers/ide/ide-xfer-mode.c index af44be9d546c..0b47ca139079 100644 --- a/drivers/ide/ide-xfer-mode.c +++ b/drivers/ide/ide-xfer-mode.c @@ -107,6 +107,12 @@ u8 ide_get_best_pio_mode(ide_drive_t *drive, u8 mode_wanted, u8 max_mode) } EXPORT_SYMBOL_GPL(ide_get_best_pio_mode); +int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio) +{ + return ata_id_pio_need_iordy(drive->id, pio); +} +EXPORT_SYMBOL_GPL(ide_pio_need_iordy); + int ide_set_pio_mode(ide_drive_t *drive, const u8 mode) { ide_hwif_t *hwif = drive->hwif; -- cgit v1.2.3 From 5880b5de7101cc123778c5d17d4f3986351f3122 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Mon, 15 Jun 2009 18:52:54 +0200 Subject: ide: don't enable IORDY at a probe time * Add 'unsigned long port_flags' field to ide_hwif_t. * Add IDE_PFLAG_PROBING port flag and keep it set during probing. * Fix ide_pio_need_iordy() to not enable IORDY at a probe time (IORDY may lead to controller lock up on certain controllers if the port is not occupied). Loosely based on the recent libata's fix by Tejun, thanks to Alan for the hint that IDE may also need it. Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/ide-probe.c | 16 +++++++++++++++- drivers/ide/ide-xfer-mode.c | 6 ++++++ include/linux/ide.h | 6 ++++++ 3 files changed, 27 insertions(+), 1 deletion(-) (limited to 'drivers/ide/ide-xfer-mode.c') diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c index f371b0de314f..fdd04bcd5568 100644 --- a/drivers/ide/ide-probe.c +++ b/drivers/ide/ide-probe.c @@ -1378,6 +1378,9 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d, ide_init_port(hwif, i & 1, d); ide_port_cable_detect(hwif); + + hwif->port_flags |= IDE_PFLAG_PROBING; + ide_port_init_devices(hwif); } @@ -1388,6 +1391,8 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d, if (ide_probe_port(hwif) == 0) hwif->present = 1; + hwif->port_flags &= ~IDE_PFLAG_PROBING; + if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 || hwif->mate == NULL || hwif->mate->present == 0) { if (ide_register_port(hwif)) { @@ -1569,11 +1574,20 @@ EXPORT_SYMBOL_GPL(ide_host_remove); void ide_port_scan(ide_hwif_t *hwif) { + int rc; + ide_port_apply_params(hwif); ide_port_cable_detect(hwif); + + hwif->port_flags |= IDE_PFLAG_PROBING; + ide_port_init_devices(hwif); - if (ide_probe_port(hwif) < 0) + rc = ide_probe_port(hwif); + + hwif->port_flags &= ~IDE_PFLAG_PROBING; + + if (rc < 0) return; hwif->present = 1; diff --git a/drivers/ide/ide-xfer-mode.c b/drivers/ide/ide-xfer-mode.c index 0b47ca139079..46d203ce60cc 100644 --- a/drivers/ide/ide-xfer-mode.c +++ b/drivers/ide/ide-xfer-mode.c @@ -109,6 +109,12 @@ EXPORT_SYMBOL_GPL(ide_get_best_pio_mode); int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio) { + /* + * IORDY may lead to controller lock up on certain controllers + * if the port is not occupied. + */ + if (pio == 0 && (drive->hwif->port_flags & IDE_PFLAG_PROBING)) + return 0; return ata_id_pio_need_iordy(drive->id, pio); } EXPORT_SYMBOL_GPL(ide_pio_need_iordy); diff --git a/include/linux/ide.h b/include/linux/ide.h index 8c7f5e50e912..8771d49aa874 100644 --- a/include/linux/ide.h +++ b/include/linux/ide.h @@ -661,6 +661,10 @@ struct ide_dma_ops { u8 (*dma_sff_read_status)(struct hwif_s *); }; +enum { + IDE_PFLAG_PROBING = (1 << 0), +}; + struct ide_host; typedef struct hwif_s { @@ -677,6 +681,8 @@ typedef struct hwif_s { ide_drive_t *devices[MAX_DRIVES + 1]; + unsigned long port_flags; + u8 major; /* our major number */ u8 index; /* 0 for ide0; 1 for ide1; ... */ u8 channel; /* for dual-port chips: 0=primary, 1=secondary */ -- cgit v1.2.3