From 870d5d963972ddefa83a09a7dbe4bef01f0b35b8 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 28 Jan 2021 15:30:00 +0530 Subject: 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: Dmitry Osipenko Reported-by: Akhil P Oommen Signed-off-by: Viresh Kumar Tested-by: Dmitry Osipenko --- drivers/opp/core.c | 40 +++++++++++++++++++++++++++------------- 1 file changed, 27 insertions(+), 13 deletions(-) (limited to 'drivers/opp') diff --git a/drivers/opp/core.c b/drivers/opp/core.c index e03600547b98..a518173fd64a 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1015,8 +1015,16 @@ 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) { @@ -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); + 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; - } - } + /* Make sure current_opp doesn't get freed */ + dev_pm_opp_get(opp); + opp_table->current_opp = opp; return ret; } -- cgit v1.2.3-59-g8ed1b