From f0dd8712eb8cc5687b4582fbc41cfbcd55bba0d2 Mon Sep 17 00:00:00 2001 From: Albert Lee Date: Sat, 17 Feb 2007 02:40:21 +0100 Subject: [PATCH] ide: clear bmdma status in ide_intr() for ICHx controllers (revised #4) patch 1/2 (revised): - Fix drive->waiting_for_dma to work with CDB-intr devices. - Do the dma status clearing in ide_intr() and add a new hwif->ide_dma_clear_irq for Intel ICHx controllers. Revised per Alan, Sergei and Bart's advice. Patch against 2.6.20-rc6. Tested ok on my ICH4 and pdc20275 adapters. Please review/apply, thanks. Signed-off-by: Albert Lee Cc: Sergei Shtylyov Cc: Alan Cox Cc: "Adam W. Hawks" Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/ide-cd.c | 8 +++++++ drivers/ide/ide-io.c | 11 +++++++++ drivers/ide/ide.c | 1 + drivers/ide/pci/piix.c | 63 ++++++++++++++++++++++++++++++++++++++------------ include/linux/ide.h | 1 + 5 files changed, 69 insertions(+), 15 deletions(-) diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index 5969cec..21f4ae2 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -930,6 +930,10 @@ static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive, HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG); if (CDROM_CONFIG_FLAGS (drive)->drq_interrupt) { + /* waiting for CDB interrupt, not DMA yet. */ + if (info->dma) + drive->waiting_for_dma = 0; + /* packet command */ ide_execute_command(drive, WIN_PACKETCMD, handler, ATAPI_WAIT_PC, cdrom_timer_expiry); return ide_started; @@ -972,6 +976,10 @@ static ide_startstop_t cdrom_transfer_packet_command (ide_drive_t *drive, /* Check for errors. */ if (cdrom_decode_status(drive, DRQ_STAT, NULL)) return ide_stopped; + + /* Ok, next interrupt will be DMA interrupt. */ + if (info->dma) + drive->waiting_for_dma = 1; } else { /* Otherwise, we must wait for DRQ to get set. */ if (ide_wait_stat(&startstop, drive, DRQ_STAT, diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c index 2614f41..99d1c43 100644 --- a/drivers/ide/ide-io.c +++ b/drivers/ide/ide-io.c @@ -1646,6 +1646,17 @@ irqreturn_t ide_intr (int irq, void *dev_id) del_timer(&hwgroup->timer); spin_unlock(&ide_lock); + /* Some controllers might set DMA INTR no matter DMA or PIO; + * bmdma status might need to be cleared even for + * PIO interrupts to prevent spurious/lost irq. + */ + if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma)) + /* ide_dma_end() needs bmdma status for error checking. + * So, skip clearing bmdma status here and leave it + * to ide_dma_end() if this is dma interrupt. + */ + hwif->ide_dma_clear_irq(drive); + if (drive->unmask) local_irq_enable_in_hardirq(); /* service this interrupt, may set handler for next interrupt */ diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c index c750f6c..65eb0954 100644 --- a/drivers/ide/ide.c +++ b/drivers/ide/ide.c @@ -509,6 +509,7 @@ static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif) hwif->ide_dma_on = tmp_hwif->ide_dma_on; hwif->ide_dma_off_quietly = tmp_hwif->ide_dma_off_quietly; hwif->ide_dma_test_irq = tmp_hwif->ide_dma_test_irq; + hwif->ide_dma_clear_irq = tmp_hwif->ide_dma_clear_irq; hwif->ide_dma_host_on = tmp_hwif->ide_dma_host_on; hwif->ide_dma_host_off = tmp_hwif->ide_dma_host_off; hwif->ide_dma_lostirq = tmp_hwif->ide_dma_lostirq; diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c index 52cfc2a..af65b08 100644 --- a/drivers/ide/pci/piix.c +++ b/drivers/ide/pci/piix.c @@ -410,17 +410,14 @@ fast_ata_pio: } /** - * init_chipset_piix - set up the PIIX chipset - * @dev: PCI device to set up - * @name: Name of the device + * piix_is_ichx - check if ICHx + * @dev: PCI device to check * - * Initialize the PCI device as required. For the PIIX this turns - * out to be nice and simple + * returns 1 if ICHx, 0 otherwise. */ - -static unsigned int __devinit init_chipset_piix (struct pci_dev *dev, const char *name) +static int piix_is_ichx(struct pci_dev *dev) { - switch(dev->device) { + switch (dev->device) { case PCI_DEVICE_ID_INTEL_82801EB_1: case PCI_DEVICE_ID_INTEL_82801AA_1: case PCI_DEVICE_ID_INTEL_82801AB_1: @@ -438,19 +435,51 @@ static unsigned int __devinit init_chipset_piix (struct pci_dev *dev, const char case PCI_DEVICE_ID_INTEL_ICH7_21: case PCI_DEVICE_ID_INTEL_ESB2_18: case PCI_DEVICE_ID_INTEL_ICH8_6: - { - unsigned int extra = 0; - pci_read_config_dword(dev, 0x54, &extra); - pci_write_config_dword(dev, 0x54, extra|0x400); - } - default: - break; + return 1; } return 0; } /** + * init_chipset_piix - set up the PIIX chipset + * @dev: PCI device to set up + * @name: Name of the device + * + * Initialize the PCI device as required. For the PIIX this turns + * out to be nice and simple + */ + +static unsigned int __devinit init_chipset_piix (struct pci_dev *dev, const char *name) +{ + if (piix_is_ichx(dev)) { + unsigned int extra = 0; + pci_read_config_dword(dev, 0x54, &extra); + pci_write_config_dword(dev, 0x54, extra|0x400); + } + + return 0; +} + +/** + * piix_dma_clear_irq - clear BMDMA status + * @drive: IDE drive to clear + * + * Called from ide_intr() for PIO interrupts + * to clear BMDMA status as needed by ICHx + */ +static void piix_dma_clear_irq(ide_drive_t *drive) +{ + ide_hwif_t *hwif = HWIF(drive); + u8 dma_stat; + + /* clear the INTR & ERROR bits */ + dma_stat = hwif->INB(hwif->dma_status); + /* Should we force the bit as well ? */ + hwif->OUTB(dma_stat, hwif->dma_status); +} + +/** * init_hwif_piix - fill in the hwif for the PIIX * @hwif: IDE interface * @@ -486,6 +515,10 @@ static void __devinit init_hwif_piix(ide_hwif_t *hwif) if (!hwif->dma_base) return; + /* ICHx need to clear the bmdma status for all interrupts */ + if (piix_is_ichx(hwif->pci_dev)) + hwif->ide_dma_clear_irq = &piix_dma_clear_irq; + hwif->atapi_dma = 1; hwif->ultra_mask = 0x3f; hwif->mwdma_mask = 0x06; diff --git a/include/linux/ide.h b/include/linux/ide.h index 04e0fa9..1c17dee 100644 --- a/include/linux/ide.h +++ b/include/linux/ide.h @@ -738,6 +738,7 @@ typedef struct hwif_s { int (*ide_dma_on)(ide_drive_t *drive); int (*ide_dma_off_quietly)(ide_drive_t *drive); int (*ide_dma_test_irq)(ide_drive_t *drive); + void (*ide_dma_clear_irq)(ide_drive_t *drive); int (*ide_dma_host_on)(ide_drive_t *drive); int (*ide_dma_host_off)(ide_drive_t *drive); int (*ide_dma_lostirq)(ide_drive_t *drive); -- 2.7.4