On Thu, Jan 02, 2014 at 01:28:22PM -0500, Jason Cooper wrote:
> Wolfram,
>
> On Thu, Jan 02, 2014 at 05:01:16PM +0100, Gregory CLEMENT wrote:
> > The first variants of Armada XP SoCs (A0 stepping) have issues related
> > to the i2c controller which prevent to use the offload mechanism and
> > lead to a kernel hang during boot.
> >
> > The driver now check the revision of the SoC. If the revision is not
> > more recent than the A0 or if the driver can't get the SoC revision
> > then it disables the offload mechanism.
> >
> > Cc: stable@xxxxxxxxxxxxxxx
> > Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
> > ---
> > drivers/i2c/busses/i2c-mv64xxx.c | 11 ++++++++++-
> > 1 file changed, 10 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
> > index 8be7e42aa4de..089a3663ad86 100644
> > --- a/drivers/i2c/busses/i2c-mv64xxx.c
> > +++ b/drivers/i2c/busses/i2c-mv64xxx.c
> > @@ -24,6 +24,7 @@
> > #include <linux/clk.h>
> > #include <linux/err.h>
> > #include <linux/delay.h>
> > +#include <linux/mvebu-soc-id.h>
> >
> > #define MV64XXX_I2C_ADDR_ADDR(val) ((val & 0x7f) << 1)
> > #define MV64XXX_I2C_BAUD_DIV_N(val) (val & 0x7)
> > @@ -779,8 +780,16 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
> > * Transaction Generator support and the errata fix.
> > */
> > if (of_device_is_compatible(np, "marvell,mv78230-i2c")) {
> > - drv_data->offload_enabled = true;
> > + u32 dev, rev;
> > +
> > drv_data->errata_delay = true;
> > + /*
> > + * Only revison more recent than A0 support offload
> > + * mechanism. In case we can't get the SoC revision
> > + * weplay safe and we don't enable it
> > + */
> > + if (!mvebu_get_soc_id(&rev, &dev) && (dev > MV78XX0_A0_REV))
Very minor nits:
I'd prefer (mvebu_get_soc_id == 0) here, since !mvebu_get_soc_id can
easily be read as "if not get soc id" which leads to the assumption the
function failed. And the parantheses around the second comparison are
superfluous.
> > + drv_data->offload_enabled = true;
>
> Since this depends on arch-specific code in the previous patch, I'd like
> to keep the two of them together in a topic branch. Would you prefer to
> take both with my Ack, or vice-versa? I'm fine either way.
I'd think you better take it:
Acked-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
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