Commit 870d5d96 authored by Viresh Kumar's avatar Viresh Kumar
Browse files

opp: Update bandwidth requirements based on scaling up/down 



The bandwidth must be scaled at a different point in the code flow based
on if we are scaling up or down the frequency, otherwise this may cause
undesired effects as the device will try to use more of the memory
bandwidth which may be shared across several devices. Much like how
regulators and required-opps are programmed.

Reported-by: default avatarDmitry Osipenko <digetx@gmail.com>
Reported-by: default avatarAkhil P Oommen <akhilpo@codeaurora.org>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Tested-by: default avatarDmitry Osipenko <digetx@gmail.com>
parent 7eba0c76

drivers/opp/core.c

+27 −13
Original line number Diff line number Diff line
@@ -1015,10 +1015,18 @@ static int _set_opp(struct device *dev, struct opp_table *opp_table, 
	/* Scaling up? Configure required OPPs before frequency */

	if (!scaling_down) {

		ret = _set_required_opps(dev, opp_table, opp, true);

		if (ret)

		if (ret) {

			dev_err(dev, "Failed to set required opps: %d\n", ret);

			return ret;

		}



		ret = _set_opp_bw(opp_table, opp, dev);

		if (ret) {

			dev_err(dev, "Failed to set bw: %d\n", ret);

			return ret;

		}

	}



	if (opp_table->set_opp) {

		ret = _set_opp_custom(opp_table, dev, opp, freq);

	} else if (opp_table->regulators) {
@@ -1029,24 +1037,30 @@ static int _set_opp(struct device *dev, struct opp_table *opp_table, 
		ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);

	}



	if (ret)

		return ret;



	/* Scaling down? Configure required OPPs after frequency */

	if (!ret && scaling_down) {

	if (scaling_down) {

		ret = _set_opp_bw(opp_table, opp, dev);

		if (ret) {

			dev_err(dev, "Failed to set bw: %d\n", ret);

			return ret;

		}



		ret = _set_required_opps(dev, opp_table, opp, false);

		if (ret)

		if (ret) {

			dev_err(dev, "Failed to set required opps: %d\n", ret);

			return ret;

		}

	}



	if (!ret) {

		ret = _set_opp_bw(opp_table, opp, dev);

		if (!ret) {

	opp_table->enabled = true;

	dev_pm_opp_put(old_opp);



	/* Make sure current_opp doesn't get freed */

	dev_pm_opp_get(opp);

	opp_table->current_opp = opp;

		}

	}



	return ret;

}