diff options
| author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2015-04-03 09:25:54 (GMT) |
|---|---|---|
| committer | Kukjin Kim <kgene@kernel.org> | 2015-06-05 17:17:56 (GMT) |
| commit | 29e5eea06bc19114b1df668f85b605914766a899 (patch) | |
| tree | 1ed2b1c02c06e9061584794e141e6796c836211d /arch/arm/mach-exynos | |
| parent | 0c5f989f1fde27df3ddb7ffd84525b4b64eb179c (diff) | |
| download | linux-29e5eea06bc19114b1df668f85b605914766a899.tar.xz | |
ARM: EXYNOS: Get current parent clock for power domain on/off
Using a fixed (by DTS) parent for clocks when turning on the power
domain may introduce issues in other drivers. For example when such
driver changes the parent during runtime and expects that he is the
only place of such change.
Do not rely on DTS providing the fixed parent for such clocks. Instead
before switching domain off, grab a current parent of a clock with
clk_get_parent().
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
Diffstat (limited to 'arch/arm/mach-exynos')
| -rw-r--r-- | arch/arm/mach-exynos/pm_domains.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c index 440324c..1639645 100644 --- a/arch/arm/mach-exynos/pm_domains.c +++ b/arch/arm/mach-exynos/pm_domains.c @@ -62,6 +62,7 @@ static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on) for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) { if (IS_ERR(pd->clk[i])) break; + pd->pclk[i] = clk_get_parent(pd->clk[i]); if (clk_set_parent(pd->clk[i], pd->oscclk)) pr_err("%s: error setting oscclk as parent to clock %d\n", pd->name, i); @@ -90,6 +91,9 @@ static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on) for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) { if (IS_ERR(pd->clk[i])) break; + + if (IS_ERR(pd->clk[i])) + continue; /* Skip on first power up */ if (clk_set_parent(pd->clk[i], pd->pclk[i])) pr_err("%s: error setting parent to clock%d\n", pd->name, i); @@ -182,13 +186,11 @@ static __init int exynos4_pm_init_power_domain(void) pd->clk[i] = clk_get(dev, clk_name); if (IS_ERR(pd->clk[i])) break; - snprintf(clk_name, sizeof(clk_name), "pclk%d", i); - pd->pclk[i] = clk_get(dev, clk_name); - if (IS_ERR(pd->pclk[i])) { - clk_put(pd->clk[i]); - pd->clk[i] = ERR_PTR(-EINVAL); - break; - } + /* + * Skip setting parent on first power up. + * The parent at this time may not be useful at all. + */ + pd->pclk[i] = ERR_PTR(-EINVAL); } if (IS_ERR(pd->clk[0])) |