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PM / devfreq: tegra30: Handle possible round-rate error

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The EMC clock rate rounding technically could fail, hence let's handle
the error cases properly.

Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Dmitry Osipenko 2019-11-05 00:56:01 +03:00 committed by Chanwoo Choi
parent d49eeb1e83
commit 7296443b90
1 changed files with 15 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

17
drivers/devfreq/tegra30-devfreq.c
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@ -592,8 +592,8 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
struct tegra_devfreq_device *dev;
struct tegra_devfreq *tegra;
struct devfreq *devfreq;
unsigned long rate;
unsigned int i;
long rate;
int err;
tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
@ -650,8 +650,14 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
reset_control_deassert(tegra->reset);
tegra->max_freq = clk_round_rate(tegra->emc_clock, ULONG_MAX) / KHZ;
rate = clk_round_rate(tegra->emc_clock, ULONG_MAX);
if (rate < 0) {
dev_err(&pdev->dev, "Failed to round clock rate: %ld\n", rate);
return rate;
}
tegra->cur_freq = clk_get_rate(tegra->emc_clock) / KHZ;
tegra->max_freq = rate / KHZ;
for (i = 0; i < ARRAY_SIZE(actmon_device_configs); i++) {
dev = tegra->devices + i;
@ -662,6 +668,13 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
for (rate = 0; rate <= tegra->max_freq * KHZ; rate++) {
rate = clk_round_rate(tegra->emc_clock, rate);
if (rate < 0) {
dev_err(&pdev->dev,
"Failed to round clock rate: %ld\n", rate);
err = rate;
goto remove_opps;
}
err = dev_pm_opp_add(&pdev->dev, rate, 0);
if (err) {
dev_err(&pdev->dev, "Failed to add OPP: %d\n", err);