90 lines
2.3 KiB
Diff
90 lines
2.3 KiB
Diff
From 63a0c32028148e91ea91cfbf95841c4ecd69d21b Mon Sep 17 00:00:00 2001
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From: Claudiu Beznea <claudiu.beznea@microchip.com>
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Date: Mon, 11 Oct 2021 14:27:06 +0300
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Subject: [PATCH 235/247] clk: at91: pmc: execute suspend/resume only for
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backup mode
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Before going to backup mode architecture specific PM code sets the first
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word in securam (file arch/arm/mach-at91/pm.c, function at91_pm_begin()).
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Thus take this into account when suspending/resuming clocks. This will
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avoid executing unnecessary instructions when suspending to non backup
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modes.
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Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
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Link: https://lore.kernel.org/r/20211011112719.3951784-3-claudiu.beznea@microchip.com
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Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
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Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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---
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drivers/clk/at91/pmc.c | 39 +++++++++++++++++++++++++++++++++++++++
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1 file changed, 39 insertions(+)
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--- a/drivers/clk/at91/pmc.c
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+++ b/drivers/clk/at91/pmc.c
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@@ -8,6 +8,7 @@
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#include <linux/clkdev.h>
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#include <linux/clk/at91_pmc.h>
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#include <linux/of.h>
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+#include <linux/of_address.h>
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#include <linux/mfd/syscon.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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@@ -110,13 +111,35 @@ struct pmc_data *pmc_data_allocate(unsig
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}
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#ifdef CONFIG_PM
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+
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+/* Address in SECURAM that say if we suspend to backup mode. */
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+static void __iomem *at91_pmc_backup_suspend;
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+
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static int at91_pmc_suspend(void)
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{
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+ unsigned int backup;
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+
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+ if (!at91_pmc_backup_suspend)
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+ return 0;
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+
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+ backup = readl_relaxed(at91_pmc_backup_suspend);
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+ if (!backup)
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+ return 0;
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+
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return clk_save_context();
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}
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static void at91_pmc_resume(void)
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{
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+ unsigned int backup;
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+
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+ if (!at91_pmc_backup_suspend)
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+ return;
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+
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+ backup = readl_relaxed(at91_pmc_backup_suspend);
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+ if (!backup)
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+ return;
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+
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clk_restore_context();
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}
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@@ -144,6 +167,22 @@ static int __init pmc_register_ops(void)
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}
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of_node_put(np);
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+ np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
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+ if (!np)
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+ return -ENODEV;
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+
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+ if (!of_device_is_available(np)) {
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+ of_node_put(np);
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+ return -ENODEV;
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+ }
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+ of_node_put(np);
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+
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+ at91_pmc_backup_suspend = of_iomap(np, 0);
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+ if (!at91_pmc_backup_suspend) {
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+ pr_warn("%s(): unable to map securam\n", __func__);
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+ return -ENOMEM;
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+ }
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+
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register_syscore_ops(&pmc_syscore_ops);
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return 0;
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