[RESEND][PATCH] sata_fsl: hard and soft reset split

[RESEND][PATCH] sata_fsl: hard and soft reset split

[ashish kalra]

Split sata_fsl_softreset() into hard and soft resets to make
error-handling more efficient & device and PMP detection more reliable.

Also includes fix for PMP support, driver tested with Sil3726, Sil4726 &
Exar PMP controllers.

Signed-off-by: Ashish Kalra <Ashish.Kalra@freescale.com>
---
  drivers/ata/sata_fsl.c |   85 +++++++++++++++++++++++++-----------------------
  1 files changed, 44 insertions(+), 41 deletions(-)

diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index 5751145..c8e2fad 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -708,34 +708,17 @@ static unsigned int sata_fsl_dev_classify(struct ata_port *ap)
  	return ata_dev_classify(&tf);
  }

-static int sata_fsl_prereset(struct ata_link *link, unsigned long deadline)
-{
-	/* FIXME: Never skip softreset, sata_fsl_softreset() is
-	 * combination of soft and hard resets.  sata_fsl_softreset()
-	 * needs to be splitted into soft and hard resets.
-	 */
-	return 0;
-}
-
-static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
+static int sata_fsl_hardreset(struct ata_link *link, unsigned int *class,
  					unsigned long deadline)
  {
  	struct ata_port *ap = link->ap;
-	struct sata_fsl_port_priv *pp = ap->private_data;
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
-	int pmp = sata_srst_pmp(link);
  	u32 temp;
-	struct ata_taskfile tf;
-	u8 *cfis;
-	u32 Serror;
  	int i = 0;
  	unsigned long start_jiffies;

-	DPRINTK("in xx_softreset\n");
-
-	if (pmp != SATA_PMP_CTRL_PORT)
-		goto issue_srst;
+	DPRINTK("in xx_hardreset\n");

  try_offline_again:
  	/*
@@ -750,7 +733,7 @@ try_offline_again:

  	if (temp & ONLINE) {
  		ata_port_printk(ap, KERN_ERR,
-				"Softreset failed, not off-lined %d\n", i);
+				"Hardreset failed, not off-lined %d\n", i);

  		/*
  		 * Try to offline controller atleast twice
@@ -762,7 +745,7 @@ try_offline_again:
  			goto try_offline_again;
  	}

-	DPRINTK("softreset, controller off-lined\n");
+	DPRINTK("hardreset, controller off-lined\n");
  	VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
  	VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));

@@ -787,11 +770,11 @@ try_offline_again:

  	if (!(temp & ONLINE)) {
  		ata_port_printk(ap, KERN_ERR,
-				"Softreset failed, not on-lined\n");
+				"Hardreset failed, not on-lined\n");
  		goto err;
  	}

-	DPRINTK("softreset, controller off-lined & on-lined\n");
+	DPRINTK("hardreset, controller off-lined & on-lined\n");
  	VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
  	VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));

@@ -807,7 +790,7 @@ try_offline_again:
  				"No Device OR PHYRDY change,Hstatus = 0x%x\n",
  				ioread32(hcr_base + HSTATUS));
  		*class = ATA_DEV_NONE;
-		goto out;
+		return 0;
  	}

  	/*
@@ -820,11 +803,44 @@ try_offline_again:
  	if ((temp & 0xFF) != 0x18) {
  		ata_port_printk(ap, KERN_WARNING, "No Signature Update\n");
  		*class = ATA_DEV_NONE;
-		goto out;
+		goto do_followup_srst;
  	} else {
  		ata_port_printk(ap, KERN_INFO,
  				"Signature Update detected @ %d msecs\n",
  				jiffies_to_msecs(jiffies - start_jiffies));
+		*class = sata_fsl_dev_classify(ap);
+		return 0;
+	}
+
+do_followup_srst:
+	/*
+	 * request libATA to perform follow-up softreset
+	 */
+	return -EAGAIN;
+
+err:
+	return -EIO;
+}
+
+static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
+					unsigned long deadline)
+{
+	struct ata_port *ap = link->ap;
+	struct sata_fsl_port_priv *pp = ap->private_data;
+	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
+	void __iomem *hcr_base = host_priv->hcr_base;
+	int pmp = sata_srst_pmp(link);
+	u32 temp;
+	struct ata_taskfile tf;
+	u8 *cfis;
+	u32 Serror;
+
+	DPRINTK("in xx_softreset\n");
+
+	if (ata_link_offline(link)) {
+		DPRINTK("PHY reports no device\n");
+		*class = ATA_DEV_NONE;
+		return 0;
  	}

  	/*
@@ -835,7 +851,6 @@ try_offline_again:
  	 * reached here, we can send a command to the target device
  	 */

-issue_srst:
  	DPRINTK("Sending SRST/device reset\n");

  	ata_tf_init(link->device, &tf);
@@ -861,6 +876,8 @@ issue_srst:
  		ioread32(CA + hcr_base), ioread32(CC + hcr_base));

  	iowrite32(0xFFFF, CC + hcr_base);
+	if (pmp != SATA_PMP_CTRL_PORT)
+		iowrite32(pmp, CQPMP + hcr_base);
  	iowrite32(1, CQ + hcr_base);

  	temp = ata_wait_register(CQ + hcr_base, 0x1, 0x1, 1, 5000);
@@ -927,7 +944,6 @@ issue_srst:
  		VPRINTK("cereg = 0x%x\n", ioread32(hcr_base + CE));
  	}

-out:
  	return 0;

  err:
@@ -988,19 +1004,6 @@ static void sata_fsl_error_intr(struct ata_port *ap)
  	if (hstatus & FATAL_ERROR_DECODE) {
  		ehi->err_mask |= AC_ERR_ATA_BUS;
  		ehi->action |= ATA_EH_SOFTRESET;
-
-		/*
-		 * Ignore serror in case of fatal errors as we always want
-		 * to do a soft-reset of the FSL SATA controller. Analyzing
-		 * serror may cause libata to schedule a hard-reset action,
-		 * and hard-reset currently does not do controller
-		 * offline/online, causing command timeouts and leads to an
-		 * un-recoverable state, hence make libATA ignore
-		 * autopsy in case of fatal errors.
-		 */
-
-		ehi->flags |= ATA_EHI_NO_AUTOPSY;
-
  		freeze = 1;
  	}

@@ -1272,8 +1275,8 @@ static struct ata_port_operations sata_fsl_ops = {

  	.freeze = sata_fsl_freeze,
  	.thaw = sata_fsl_thaw,
-	.prereset = sata_fsl_prereset,
  	.softreset = sata_fsl_softreset,
+	.hardreset = sata_fsl_hardreset,
  	.pmp_softreset = sata_fsl_softreset,
  	.error_handler = sata_fsl_error_handler,
  	.post_internal_cmd = sata_fsl_post_internal_cmd,
-- 
1.6.0

Re: [RESEND][PATCH] sata_fsl: hard and soft reset split

[Sergei Shtylyov]

Hello.

ashish kalra wrote:

> Split sata_fsl_softreset() into hard and soft resets to make
> error-handling more efficient & device and PMP detection more reliable.

> Also includes fix for PMP support, driver tested with Sil3726, Sil4726 &
> Exar PMP controllers.

> Signed-off-by: Ashish Kalra <Ashish.Kalra@freescale.com>

[...]

> diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
> index 5751145..c8e2fad 100644
> --- a/drivers/ata/sata_fsl.c
> +++ b/drivers/ata/sata_fsl.c
> @@ -708,34 +708,17 @@ static unsigned int sata_fsl_dev_classify(struct 
> ata_port *ap)
>      return ata_dev_classify(&tf);
>  }
> 
> -static int sata_fsl_prereset(struct ata_link *link, unsigned long 
> deadline)
> -{
> -    /* FIXME: Never skip softreset, sata_fsl_softreset() is
> -     * combination of soft and hard resets.  sata_fsl_softreset()
> -     * needs to be splitted into soft and hard resets.
> -     */
> -    return 0;
> -}
> -
> -static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
> +static int sata_fsl_hardreset(struct ata_link *link, unsigned int *class,
>                      unsigned long deadline)
>  {
>      struct ata_port *ap = link->ap;
> -    struct sata_fsl_port_priv *pp = ap->private_data;
>      struct sata_fsl_host_priv *host_priv = ap->host->private_data;
>      void __iomem *hcr_base = host_priv->hcr_base;
> -    int pmp = sata_srst_pmp(link);
>      u32 temp;
> -    struct ata_taskfile tf;
> -    u8 *cfis;
> -    u32 Serror;
>      int i = 0;
>      unsigned long start_jiffies;
> 
> -    DPRINTK("in xx_softreset\n");
> -
> -    if (pmp != SATA_PMP_CTRL_PORT)
> -        goto issue_srst;
> +    DPRINTK("in xx_hardreset\n");
> 
>  try_offline_again:
>      /*
> @@ -750,7 +733,7 @@ try_offline_again:
> 
>      if (temp & ONLINE) {
>          ata_port_printk(ap, KERN_ERR,
> -                "Softreset failed, not off-lined %d\n", i);
> +                "Hardreset failed, not off-lined %d\n", i);
> 
>          /*
>           * Try to offline controller atleast twice
> @@ -762,7 +745,7 @@ try_offline_again:
>              goto try_offline_again;
>      }
> 
> -    DPRINTK("softreset, controller off-lined\n");
> +    DPRINTK("hardreset, controller off-lined\n");
>      VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
>      VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
> 
> @@ -787,11 +770,11 @@ try_offline_again:
> 
>      if (!(temp & ONLINE)) {
>          ata_port_printk(ap, KERN_ERR,
> -                "Softreset failed, not on-lined\n");
> +                "Hardreset failed, not on-lined\n");
>          goto err;
>      }
> 
> -    DPRINTK("softreset, controller off-lined & on-lined\n");
> +    DPRINTK("hardreset, controller off-lined & on-lined\n");
>      VPRINTK("HStatus = 0x%x\n", ioread32(hcr_base + HSTATUS));
>      VPRINTK("HControl = 0x%x\n", ioread32(hcr_base + HCONTROL));
> 
> @@ -807,7 +790,7 @@ try_offline_again:
>                  "No Device OR PHYRDY change,Hstatus = 0x%x\n",
>                  ioread32(hcr_base + HSTATUS));
>          *class = ATA_DEV_NONE;
> -        goto out;
> +        return 0;
>      }
> 
>      /*
> @@ -820,11 +803,44 @@ try_offline_again:
>      if ((temp & 0xFF) != 0x18) {
>          ata_port_printk(ap, KERN_WARNING, "No Signature Update\n");
>          *class = ATA_DEV_NONE;
> -        goto out;
> +        goto do_followup_srst;
>      } else {
>          ata_port_printk(ap, KERN_INFO,
>                  "Signature Update detected @ %d msecs\n",
>                  jiffies_to_msecs(jiffies - start_jiffies));
> +        *class = sata_fsl_dev_classify(ap);
> +        return 0;
> +    }
> +
> +do_followup_srst:
> +    /*
> +     * request libATA to perform follow-up softreset
> +     */
> +    return -EAGAIN;
> +
> +err:
> +    return -EIO;

    Why produce unneeded labels and goto's where you can just use return? :-O

MBR, Sergei

Re: [RESEND][PATCH] sata_fsl: hard and soft reset split

[Jeff Garzik]

On 06/29/2009 09:26 AM, ashish kalra wrote:
> Split sata_fsl_softreset() into hard and soft resets to make
> error-handling more efficient & device and PMP detection more reliable.
>
> Also includes fix for PMP support, driver tested with Sil3726, Sil4726 &
> Exar PMP controllers.
>
> Signed-off-by: Ashish Kalra <Ashish.Kalra@freescale.com>

can you rediff this and 'AN' support against latest upstream?

RE: [RESEND][PATCH] sata_fsl: hard and soft reset split

[Kalra Ashish-B00888]

Hello Jeff,

I will do the rediff and resubmit the patch.

Thanks,
Ashish=20

-----Original Message-----
From: Jeff Garzik [mailto:jeff@garzik.org]=20
Sent: Friday, September 11, 2009 12:08 PM
To: Kalra Ashish-B00888
Cc: linux-ide@vger.kernel.org; linuxppc-dev@ozlabs.org
Subject: Re: [RESEND][PATCH] sata_fsl: hard and soft reset split

On 06/29/2009 09:26 AM, ashish kalra wrote:
> Split sata_fsl_softreset() into hard and soft resets to make=20
> error-handling more efficient & device and PMP detection more
reliable.
>
> Also includes fix for PMP support, driver tested with Sil3726, Sil4726

> & Exar PMP controllers.
>
> Signed-off-by: Ashish Kalra <Ashish.Kalra@freescale.com>

can you rediff this and 'AN' support against latest upstream?