On Sat, Oct 21, 2017 at 10:29:08AM +0100, Mark Brown wrote:
> On Thu, Oct 19, 2017 at 08:33:22AM +0530, Vinod Koul wrote:
>
> > +static bool sdw_get_page(struct sdw_slave *slave, struct sdw_msg *msg)
> > +{
> > + bool page = false, paging_support = false;
> > +
> > + if (slave && slave->prop.paging_support)
> > + paging_support = true;
> > +
> > + /*
> > + * Programme SCP page addr for:
> > + * 1. addr_page1 and addr_page2 contains non-zero values.
> > + * 2. Paging supported by Slave.
> > + */
> > + switch (msg->dev_num) {
> > + case SDW_ENUM_DEV_NUM:
> > + case SDW_BROADCAST_DEV_NUM:
> > + break;
> > +
> > + default:
> > + if (paging_support && ((msg->addr_page1) || (msg->addr_page2)))
> > + page = true;
> > + }
> > +
> > + return page;
>
> So if a page was specified but we don't have paging support we silently
> just write to the base pagee?
yeah we should log this, will add
> > +int sdw_transfer(struct sdw_bus *bus, struct sdw_slave *slave,
> > + struct sdw_msg *msg)
> > +{
> > + bool page;
> > + int ret;
> > +
> > + mutex_lock(&bus->msg_lock);
> > +
> > + page = sdw_get_page(slave, msg);
>
> get_page() doesn't interact with the hardware at all so it could be
> outside the lock.
right
>
> > + ret = do_transfer(bus, msg, page);
> > + if (ret != 0 && ret != -ENODATA) {
> > + dev_err(bus->dev, "trf on Slave %d failed:%d\n",
> > + msg->dev_num, ret);
> > + goto error;
> > + }
> > +
> > + if (page)
> > + ret = sdw_reset_page(bus, msg->dev_num);
>
> Wouldn't it be safer to reset the page even on error so future messages
> go to the right place if the paging bit of the failed operation worked?
You have a valid point, let me check that part.
> > +int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
> > +{
> > + struct sdw_msg msg;
> > + int ret;
> > +
> > + pm_runtime_get_sync(slave->bus->dev);
>
> No error check.
will add
> > + pm_runtime_get_sync(slave->bus->dev);
> > +
> > + sdw_fill_msg(&msg, addr, count, slave->dev_num, SDW_MSG_FLAG_WRITE,
> > val);
>
> The device doesn't need to be powered up for us to fill in the data
> structures we're going to use.
Yes I can move it down a bit before do_transfer()
--
~Vinod
