From 4189dd5119cb9c2e59315e65e6c44fcd779235bb Mon Sep 17 00:00:00 2001 From: "k.konieczny@partner.samsung.com" Date: Tue, 8 Oct 2019 15:49:23 +0200 Subject: [PATCH 13/75] ODROID-XU4: devfreq: exynos-bus: workaround dev_pm_opp_set_rate() errors on Exynos5422/5800 SoCs Commit 4294a779bd8d ("PM / devfreq: exynos-bus: Convert to use dev_pm_opp_set_rate()") introduced errors: exynos-bus: new bus device registered: soc:bus_wcore ( 84000 KHz ~ 400000 KHz) exynos-bus: new bus device registered: soc:bus_noc ( 67000 KHz ~ 100000 KHz) exynos-bus: new bus device registered: soc:bus_fsys_apb (100000 KHz ~ 200000 KHz) ... exynos-bus soc:bus_wcore: dev_pm_opp_set_rate: failed to find current OPP for freq 532000000 (-34) exynos-bus soc:bus_noc: dev_pm_opp_set_rate: failed to find current OPP for freq 111000000 (-34) exynos-bus soc:bus_fsys_apb: dev_pm_opp_set_rate: failed to find current OPP for freq 222000000 (-34) They are caused by incorrect PLL assigned to clock source, which results in clock rate outside of OPP range. Add workaround for this in exynos_bus_parse_of() by adjusting clock rate to those present in OPP. Fixes: 4294a779bd8d ("PM / devfreq: exynos-bus: Convert to use dev_pm_opp_set_rate()") Change-Id: Ic07e2d68e0da2efa07cb81cc9b4f76d8ad15bd76 Reported-by: Krzysztof Kozlowski Signed-off-by: Kamil Konieczny Signed-off-by: memeka --- drivers/devfreq/exynos-bus.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c index e689101abc93..061f36c00dd4 100644 --- a/drivers/devfreq/exynos-bus.c +++ b/drivers/devfreq/exynos-bus.c @@ -247,7 +247,7 @@ static int exynos_bus_parse_of(struct device_node *np, { struct device *dev = bus->dev; struct dev_pm_opp *opp; - unsigned long rate; + unsigned long rate, opp_rate; int ret; /* Get the clock to provide each bus with source clock */ @@ -271,13 +271,21 @@ static int exynos_bus_parse_of(struct device_node *np, } rate = clk_get_rate(bus->clk); - - opp = devfreq_recommended_opp(dev, &rate, 0); + opp_rate = rate; + opp = devfreq_recommended_opp(dev, &opp_rate, 0); if (IS_ERR(opp)) { dev_err(dev, "failed to find dev_pm_opp\n"); ret = PTR_ERR(opp); goto err_opp; } + /* + * FIXME: U-boot leaves clock source at incorrect PLL, this results + * in clock rate outside defined OPP rate. Work around this bug by + * setting clock rate to recommended one. + */ + if (rate > opp_rate) + clk_set_rate(bus->clk, opp_rate); + bus->curr_freq = dev_pm_opp_get_freq(opp); dev_pm_opp_put(opp); -- 2.25.1