On 05/15/2010 10:09 AM, Alan Cox wrote:
On Fri, 14 May 2010 22:24:37 -0400
Jeff Garzik<jeff@xxxxxxxxxx> wrote:
On 05/05/2010 05:25 AM, Alan Cox wrote:
/**
+ * ata_sff_exec_command_nopost - issue ATA command to host controller
+ * @ap: port to which command is being issued
+ * @tf: ATA taskfile register set
+ *
+ * Issues ATA command, with proper synchronization with interrupt
+ * handler / other threads. This version of the helper does not protect
+ * against any delayed writes done by the underlying fabric, it must
+ * therefore not be used for MMIO devices unless the device handles
+ * the 400nS command delay stall internally.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+void ata_sff_exec_command_nopost(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
+ iowrite8(tf->command, ap->ioaddr.command_addr);
+}
+EXPORT_SYMBOL_GPL(ata_sff_exec_command_nopost);
where did the 400ns delay go, for the 'nopost' version?
Good question. It should indeed have an ndelay(400) after the iowrite8
I'll go fix that.
Ping...
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