diff options
Diffstat (limited to 'target/linux/at91/patches-5.10/235-clk-at91-pmc-execute-suspend-resume-only-for-backup-.patch')
| -rw-r--r-- | target/linux/at91/patches-5.10/235-clk-at91-pmc-execute-suspend-resume-only-for-backup-.patch | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/target/linux/at91/patches-5.10/235-clk-at91-pmc-execute-suspend-resume-only-for-backup-.patch b/target/linux/at91/patches-5.10/235-clk-at91-pmc-execute-suspend-resume-only-for-backup-.patch new file mode 100644 index 0000000000..2f8dcf6217 --- /dev/null +++ b/target/linux/at91/patches-5.10/235-clk-at91-pmc-execute-suspend-resume-only-for-backup-.patch @@ -0,0 +1,94 @@ +From 63a0c32028148e91ea91cfbf95841c4ecd69d21b Mon Sep 17 00:00:00 2001 +From: Claudiu Beznea <claudiu.beznea@microchip.com> +Date: Mon, 11 Oct 2021 14:27:06 +0300 +Subject: [PATCH 235/247] 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> +--- + drivers/clk/at91/pmc.c | 39 +++++++++++++++++++++++++++++++++++++++ + 1 file changed, 39 insertions(+) + +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; +-- +2.32.0 + |