On Sun, Jan 26, 2014 at 08:32:10AM +0100, Thomas Petazzoni wrote:
> Dear Simon Guinot,
Hi Thomas,
>
> On Tue, 14 Jan 2014 15:50:06 +0100, Simon Guinot wrote:
>
> > + if (hpriv->hp_flags & MV_HP_FIX_LP_PHY_CTL) {
> > + void __iomem *lp_phy_addr =
> > + mv_ap_base(link->ap) + LP_PHY_CTL;
> > + /*
> > + * Set PHY speed according to SControl speed.
> > + */
> > + if ((val & 0xf0) == 0x10)
> > + writelfl(0x7, lp_phy_addr);
> > + else
> > + writelfl(0x227, lp_phy_addr);
> > + }
>
> I think we could do a little bit better than these magical values.
>
> The datasheet says:
>
> * bits 12:9, PIN_PHY_GEN_RX. Value 0x0 => 1.5 Gbps, value 0x1 => 3 Gbps
> * bits 8:5, PIN_PHY_GEN_TX. Value 0x0 => 1.5 Gbps, value 0x1 => 3 Gbps
> * bit 2, PIN_PU_TX. Value 0x0 => Power down, value 0x1 => Power up.
> * bit 1, PIN_PU_RX. Value 0x0 => Power down, value 0x1 => Power up.
> * bit 0, PIN_PU_PLL. Value 0x0 => Power down, value 0x1 => Power up.
I missed this section in the datasheet...
>
> So maybe something like:
>
> #define PIN_PHY_GEN_1_5 0
> #define PIN_PHY_GEN_3 1
>
> #define PIN_PHY_GEN_RX(gen) ((gen) << 9)
> #define PIN_PHY_GEN_TX(gen) ((gen) << 5)
> #define PIN_PU_TX BIT(2)
> #define PIN_PU_RX BIT(1)
> #define PIN_PU_PLL BIT(0)
>
>
> u32 sata_gen;
>
> if ((val & 0xf0) == 0x10)
> sata_gen = PIN_PHY_GEN_1_5;
> else
> sata_gen = PIN_PHY_GEN_3;
>
> writelfl(PIN_PHY_GEN_RX(sata_gen) |
> PIN_PHY_GEN_TX(sata_gen) |
> PIN_PU_TX | PIN_PU_RX | PIN_PU_PLL,
> lp_phy_addr);
Yes, it is much more understandable.
>
>
> > + /*
> > + * To allow disk hotplug on Armada 370/XP SoCs, the PHY speed must be
> > + * updated in the LP_PHY_CTL register.
> > + */
> > + if (pdev->dev.of_node &&
> > + of_device_is_compatible(pdev->dev.of_node,
> > + "marvell,armada-370-xp-sata"))
>
> Testing whether pdev->dev.of_node is not NULL does not seems to be
> useful. A quick read of of_device_is_compatible() and the function it's
> calling seem to indicate that of_device_is_compatible will return false
> if the passed struct device_node * is NULL.
I see.
It seems to me, you already have a patch ready to send. Isn't it ?
Or do you want me to do the update ?
Simon
Attachment:
signature.asc
Description: Digital signature
