Hello.
On 08-02-2011 15:24, Bartlomiej Zolnierkiewicz wrote:
From 57632718f2e761e69b96e14f6900a487bad5d586 Mon Sep 17 00:00:00 2001
From: Bartlomiej Zolnierkiewicz<bzolnier@xxxxxxxxx>
Date: Tue, 8 Feb 2011 12:39:26 +0100
Subject: [PATCH 07/20] pata_it8213: unify code for programming PIO and MWDMA timings
Besides making things noticably simpler it results in ~9% decrease in
the driver LOC count and also ~6% decrease in the driver binary size
(as measured on x86-32).
Signed-off-by: Bartlomiej Zolnierkiewicz<bzolnier@xxxxxxxxx>
[...]
diff --git a/drivers/ata/pata_it8213.c b/drivers/ata/pata_it8213.c
index 911f50b..ccfd1ae 100644
--- a/drivers/ata/pata_it8213.c
+++ b/drivers/ata/pata_it8213.c
[...]
@@ -92,13 +81,18 @@ static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
{ 2, 1 },
{ 2, 3 }, };
- if (pio > 1)
+ if (pio > 1 || use_mwdma)
control |= 1; /* TIME */
- if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */
+ if (ata_pio_need_iordy(adev) || use_mwdma)
control |= 2; /* IE */
/* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
if (adev->class != ATA_DEV_ATA)
control |= 4; /* PPE */
+ /* If the drive MWDMA is faster than it can do PIO then
+ we must force PIO into PIO0 */
Fix the comment style, please.
+ if (use_mwdma && adev->pio_mode < (XFER_PIO_0 + pio))
Parens not needed around +.
+ /* Enable DMA timing only */
+ control |= 8; /* PIO cycles in PIO0 */
pci_read_config_word(dev, master_port,&master_data);
@@ -126,6 +120,22 @@ static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
}
/**
+ * it8213_set_piomode - Initialize host controller PATA PIO timings
+ * @ap: Port whose timings we are configuring
+ * @adev: Device whose timings we are configuring
+ *
+ * Set PIO mode for device, in host controller PCI config space.
+ *
+ * LOCKING:
+ * None (inherited from caller).
+ */
+
+static void it8213_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+ it8213_set_timings(ap, adev, adev->pio_mode - XFER_PIO_0, 0);
s/0/false/?
@@ -140,23 +150,14 @@ static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *dev = to_pci_dev(ap->host->dev);
- u16 master_data;
u8 speed = adev->dma_mode;
int devid = adev->devno;
u8 udma_enable;
- static const /* ISP RTC */
- u8 timings[][2] = { { 0, 0 },
- { 0, 0 },
- { 1, 0 },
- { 2, 1 },
- { 2, 3 }, };
-
- pci_read_config_word(dev, 0x40,&master_data);
pci_read_config_byte(dev, 0x48,&udma_enable);
Strange, here you're not moving that read and nnot removing disabling of
UDMA -- is that because of the missing lock?
@@ -184,46 +185,16 @@ static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
[...]
+ it8213_set_timings(ap, adev, pio, 1);
s/1/true/?
+
udma_enable&= ~(1 << devid);
- pci_write_config_word(dev, 0x40, master_data);
}
pci_write_config_byte(dev, 0x48, udma_enable);
}
WBR, Sergei
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