diff options
| author |   Claudiu Beznea <claudiu.beznea@microchip.com> | 2021-10-11 14:27:06 +0300 |
|---|---|---|
| committer |   Stephen Boyd <sboyd@kernel.org> | 2021-10-26 18:27:42 -0700 |
| commit | 4d21be86409296bd28614db22884ac122c5247d2 (patch) | |
| tree | acc69808b2b2c24648d98533721abd27c6a87c7c /drivers/clk/at91 | |
| parent | clk: at91: re-factor clocks suspend/resume (diff) | |
| download | wireguard-linux-4d21be86409296bd28614db22884ac122c5247d2.tar.xz wireguard-linux-4d21be86409296bd28614db22884ac122c5247d2.zip | |
clk: at91: pmc: execute suspend/resume only for backup mode
Before going to backup mode architecture specific PM code sets the first
word in securam (file arch/arm/mach-at91/pm.c, function at91_pm_begin()).
Thus take this into account when suspending/resuming clocks. This will
avoid executing unnecessary instructions when suspending to non backup
modes.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20211011112719.3951784-3-claudiu.beznea@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/at91')
| -rw-r--r-- | drivers/clk/at91/pmc.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index b2806946a77a..517973062719 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -8,6 +8,7 @@ #include <linux/clkdev.h> #include <linux/clk/at91_pmc.h> #include <linux/of.h> +#include <linux/of_address.h> #include <linux/mfd/syscon.h> #include <linux/platform_device.h> #include <linux/regmap.h> @@ -110,13 +111,35 @@ struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem, } #ifdef CONFIG_PM + +/* Address in SECURAM that say if we suspend to backup mode. */ +static void __iomem *at91_pmc_backup_suspend; + static int at91_pmc_suspend(void) { + unsigned int backup; + + if (!at91_pmc_backup_suspend) + return 0; + + backup = readl_relaxed(at91_pmc_backup_suspend); + if (!backup) + return 0; + return clk_save_context(); } static void at91_pmc_resume(void) { + unsigned int backup; + + if (!at91_pmc_backup_suspend) + return; + + backup = readl_relaxed(at91_pmc_backup_suspend); + if (!backup) + return; + clk_restore_context(); } @@ -144,6 +167,22 @@ static int __init pmc_register_ops(void) } of_node_put(np); + np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam"); + if (!np) + return -ENODEV; + + if (!of_device_is_available(np)) { + of_node_put(np); + return -ENODEV; + } + of_node_put(np); + + at91_pmc_backup_suspend = of_iomap(np, 0); + if (!at91_pmc_backup_suspend) { + pr_warn("%s(): unable to map securam\n", __func__); + return -ENOMEM; + } + register_syscore_ops(&pmc_syscore_ops); return 0; |