[PATCH] libata-hp-prep: implement sata_phy_debounce()
With hotplug, PHY always needs to be debounced before a reset as any reset might find new devices. Extract PHY waiting code from sata_phy_resume() and extend it to include SStatus debouncing. Note that sata_phy_debounce() is superset of what used to be done inside sata_phy_resume(). Three default debounce timing parameters are defined to be used by hot/boot plug. As resume failure during probing will be properly handled as errors, timeout doesn't have to be long as before. probeinit() uses the same timeout to retain the original behavior. Signed-off-by: Tejun Heo <htejun@gmail.com>
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@ -61,6 +61,11 @@
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#include "libata.h"
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#include "libata.h"
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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_boot[] = { 5, 100, 2000 };
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const unsigned long sata_deb_timing_eh[] = { 25, 500, 2000 };
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const unsigned long sata_deb_timing_before_fsrst[] = { 100, 2000, 5000 };
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static unsigned int ata_dev_init_params(struct ata_device *dev,
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static unsigned int ata_dev_init_params(struct ata_device *dev,
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u16 heads, u16 sectors);
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u16 heads, u16 sectors);
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static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
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static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
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@ -2427,10 +2432,81 @@ err_out:
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DPRINTK("EXIT\n");
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DPRINTK("EXIT\n");
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}
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}
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static int sata_phy_resume(struct ata_port *ap)
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/**
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* sata_phy_debounce - debounce SATA phy status
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* @ap: ATA port to debounce SATA phy status for
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* @params: timing parameters { interval, duratinon, timeout } in msec
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*
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* Make sure SStatus of @ap reaches stable state, determined by
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* holding the same value where DET is not 1 for @duration polled
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* every @interval, before @timeout. Timeout constraints the
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* beginning of the stable state. Because, after hot unplugging,
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* DET gets stuck at 1 on some controllers, this functions waits
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* until timeout then returns 0 if DET is stable at 1.
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*
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* LOCKING:
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* Kernel thread context (may sleep)
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
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{
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{
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unsigned long timeout = jiffies + (HZ * 5);
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unsigned long interval_msec = params[0];
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u32 scontrol, sstatus;
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unsigned long duration = params[1] * HZ / 1000;
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unsigned long timeout = jiffies + params[2] * HZ / 1000;
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unsigned long last_jiffies;
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u32 last, cur;
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int rc;
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if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
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return rc;
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cur &= 0xf;
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last = cur;
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last_jiffies = jiffies;
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while (1) {
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msleep(interval_msec);
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if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
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return rc;
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cur &= 0xf;
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/* DET stable? */
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if (cur == last) {
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if (cur == 1 && time_before(jiffies, timeout))
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continue;
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if (time_after(jiffies, last_jiffies + duration))
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return 0;
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continue;
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}
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/* unstable, start over */
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last = cur;
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last_jiffies = jiffies;
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/* check timeout */
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if (time_after(jiffies, timeout))
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return -EBUSY;
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}
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}
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/**
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* sata_phy_resume - resume SATA phy
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* @ap: ATA port to resume SATA phy for
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* @params: timing parameters { interval, duratinon, timeout } in msec
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*
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* Resume SATA phy of @ap and debounce it.
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*
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* LOCKING:
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* Kernel thread context (may sleep)
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
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{
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u32 scontrol;
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int rc;
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int rc;
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if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
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if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
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@ -2441,16 +2517,12 @@ static int sata_phy_resume(struct ata_port *ap)
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if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
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if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
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return rc;
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return rc;
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/* Wait for phy to become ready, if necessary. */
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/* Some PHYs react badly if SStatus is pounded immediately
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do {
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* after resuming. Delay 200ms before debouncing.
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*/
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msleep(200);
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msleep(200);
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if ((rc = sata_scr_read(ap, SCR_STATUS, &sstatus)))
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return rc;
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if ((sstatus & 0xf) != 1)
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return 0;
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} while (time_before(jiffies, timeout));
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return -EBUSY;
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return sata_phy_debounce(ap, params);
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}
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}
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/**
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/**
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@ -2468,8 +2540,10 @@ static int sata_phy_resume(struct ata_port *ap)
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*/
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*/
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void ata_std_probeinit(struct ata_port *ap)
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void ata_std_probeinit(struct ata_port *ap)
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{
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{
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static const unsigned long deb_timing[] = { 5, 100, 5000 };
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/* resume link */
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/* resume link */
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sata_phy_resume(ap);
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sata_phy_resume(ap, deb_timing);
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/* wait for device */
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/* wait for device */
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if (ata_port_online(ap))
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if (ata_port_online(ap))
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@ -2585,7 +2659,7 @@ int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
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msleep(1);
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msleep(1);
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/* bring phy back */
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/* bring phy back */
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sata_phy_resume(ap);
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sata_phy_resume(ap, sata_deb_timing_eh);
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/* TODO: phy layer with polling, timeouts, etc. */
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/* TODO: phy layer with polling, timeouts, etc. */
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if (ata_port_offline(ap)) {
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if (ata_port_offline(ap)) {
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@ -5718,6 +5792,9 @@ u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
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* Do not depend on ABI/API stability.
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* Do not depend on ABI/API stability.
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*/
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*/
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EXPORT_SYMBOL_GPL(sata_deb_timing_boot);
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EXPORT_SYMBOL_GPL(sata_deb_timing_eh);
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EXPORT_SYMBOL_GPL(sata_deb_timing_before_fsrst);
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EXPORT_SYMBOL_GPL(ata_std_bios_param);
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EXPORT_SYMBOL_GPL(ata_std_bios_param);
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EXPORT_SYMBOL_GPL(ata_std_ports);
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EXPORT_SYMBOL_GPL(ata_std_ports);
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EXPORT_SYMBOL_GPL(ata_device_add);
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EXPORT_SYMBOL_GPL(ata_device_add);
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@ -5757,6 +5834,8 @@ EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
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EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
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EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
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EXPORT_SYMBOL_GPL(ata_port_probe);
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EXPORT_SYMBOL_GPL(ata_port_probe);
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EXPORT_SYMBOL_GPL(sata_set_spd);
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EXPORT_SYMBOL_GPL(sata_set_spd);
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EXPORT_SYMBOL_GPL(sata_phy_debounce);
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EXPORT_SYMBOL_GPL(sata_phy_resume);
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EXPORT_SYMBOL_GPL(sata_phy_reset);
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EXPORT_SYMBOL_GPL(sata_phy_reset);
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EXPORT_SYMBOL_GPL(__sata_phy_reset);
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EXPORT_SYMBOL_GPL(__sata_phy_reset);
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EXPORT_SYMBOL_GPL(ata_bus_reset);
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EXPORT_SYMBOL_GPL(ata_bus_reset);
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@ -607,11 +607,17 @@ struct ata_timing {
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#define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
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#define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
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extern const unsigned long sata_deb_timing_boot[];
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extern const unsigned long sata_deb_timing_eh[];
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extern const unsigned long sata_deb_timing_before_fsrst[];
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extern void ata_port_probe(struct ata_port *);
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extern void ata_port_probe(struct ata_port *);
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extern void __sata_phy_reset(struct ata_port *ap);
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extern void __sata_phy_reset(struct ata_port *ap);
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extern void sata_phy_reset(struct ata_port *ap);
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extern void sata_phy_reset(struct ata_port *ap);
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extern void ata_bus_reset(struct ata_port *ap);
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extern void ata_bus_reset(struct ata_port *ap);
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extern int sata_set_spd(struct ata_port *ap);
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extern int sata_set_spd(struct ata_port *ap);
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extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
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extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
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extern int ata_drive_probe_reset(struct ata_port *ap,
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extern int ata_drive_probe_reset(struct ata_port *ap,
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ata_probeinit_fn_t probeinit,
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ata_probeinit_fn_t probeinit,
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ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
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ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
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