[alsa-devel] [PATCH v4 05/13] soundwire: Add helpers for ports operations

[Vinod Koul]

On Sat, Apr 21, 2018 at 06:47:24AM -0700, Pierre-Louis Bossart wrote:
> 
> >+static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
> >+				struct sdw_slave_runtime *s_rt,
> >+				struct sdw_port_runtime *p_rt, bool en)
> >+{
> >+	struct sdw_transport_params *t_params = &p_rt->transport_params;
> >+	u32 addr;
> >+	int ret;
> >+
> >+	if (bus->params.next_bank)
> >+		addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
> >+	else
> >+		addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
> >+
> >+	/*
> >+	 * Since bus doesn't support sharing a port across two streams,
> >+	 * it is safe to reset this register
> >+	 */
> >+	if (en)
> >+		ret = sdw_update(s_rt->slave, addr, 0xFF, p_rt->ch_mask);
> >+	else
> >+		ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0);
> >+
> >+	if (ret < 0)
> >+		dev_err(&s_rt->slave->dev,
> >+			"Slave chn_en reg write failed:%d port:%d",
> >+			ret, t_params->port_num);
> >+
> >+	return ret;
> >+}
> 
> Add a clarification that this routine only sets the enable/disable bits in
> the relevant bank, the actual enable/disable is done with a bank switch.

Isn't that something spec tells the reader? this is a SDW concept that we
program bank and then switch to have the effect, so why would i add comment
for that?

-- 
~Vinod