From: Prasanna Kumar <prasanna.ps@xxxxxxxxxxx> This patch adds support for restoring CLK_SRC_TOP3 register which gets modified while powergating corresponding power domains after a cycle of Suspend-to-Resume. Please refer below URL to know the background of this issue. http://www.mail-archive.com/linux-samsung-soc@xxxxxxxxxxxxxxx/msg14347.html. This is based on Common Clock Framework defined for exynos5250 and patch mentioned here http://www.mail-archive.com/linux-samsung-soc@xxxxxxxxxxxxxxx/msg16739.html Signed-off-by: Prasanna Kumar <prasanna.ps@xxxxxxxxxxx> --- arch/arm/mach-exynos/pm_domains.c | 43 +++++++++++++++++++++++++++++++++++++ 1 files changed, 43 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c index 9f1351d..b5ed384 100644 --- a/arch/arm/mach-exynos/pm_domains.c +++ b/arch/arm/mach-exynos/pm_domains.c @@ -21,8 +21,11 @@ #include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/sched.h> +#include <linux/clk.h> +#include <linux/clk-private.h> #include <mach/regs-pmu.h> +#include <plat/cpu.h> #include <plat/devs.h> /* @@ -35,6 +38,43 @@ struct exynos_pm_domain { struct generic_pm_domain pd; }; +static int exynos_pdclk_restore(struct exynos_pm_domain *domain) +{ + int i = 0; + struct clk *p_clk; + struct clk_hw *hw_clk; + const struct clk_ops *p_ops; + + const char *pdclks[][2] = { + { "gsc-power-domain", + "m_sub_aclk266" }, + { "gsc-power-domain", + "m_sub_aclk300" }, + { "mfc-power-domain", + "m_sub_aclk333" }, + }; + + for (i = 0; i < ARRAY_SIZE(pdclks); i++) { + if (!strcmp(domain->name, pdclks[i][0])) { + p_clk = clk_get(NULL, pdclks[i][1]); + if (IS_ERR(p_clk)) { + pr_err("failed to get base clk\n"); + return PTR_ERR(p_clk); + } + + hw_clk = __clk_get_hw(p_clk); + if (IS_ERR(hw_clk)) { + pr_err("failed to get hw_clk\n"); + return PTR_ERR(hw_clk); + } + p_ops = p_clk->ops; + if (p_ops != NULL && p_ops->set_parent != NULL) + p_clk->ops->set_parent(hw_clk, 1); + } + } + return 0; +} + static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on) { struct exynos_pm_domain *pd; @@ -61,6 +101,9 @@ static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on) cpu_relax(); usleep_range(80, 100); } + + if (!power_on && soc_is_exynos5250()) + exynos_pdclk_restore(pd); return 0; } -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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