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75 lines
2.4 KiB
Diff
75 lines
2.4 KiB
Diff
From 76dbc56ad65350d78d12bd9b36b00c36fb27addf Mon Sep 17 00:00:00 2001
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From: Claudiu Beznea <claudiu.beznea@microchip.com>
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Date: Mon, 23 Aug 2021 16:19:12 +0300
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Subject: [PATCH 223/247] ARM: at91: pm: do not panic if ram controllers are
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not enabled
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In case PM is enabled but there is no RAM controller information
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in DT the code will panic. Avoid such scenarios by not initializing
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platform specific PM code in case RAM controller is not provided
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via DT.
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Reported-by: Eugen Hristev <eugen.hristev@microchip.com>
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Fixes: 827de1f123ba0 ("ARM: at91: remove at91_dt_initialize and machine init_early()")
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Fixes: 892e1f4a3ae58 ("ARM: at91: pm: add sama7g5 ddr phy controller")
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Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
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Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
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Link: https://lore.kernel.org/r/20210823131915.23857-2-claudiu.beznea@microchip.com
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---
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arch/arm/mach-at91/pm.c | 22 ++++++++++++++++------
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1 file changed, 16 insertions(+), 6 deletions(-)
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--- a/arch/arm/mach-at91/pm.c
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+++ b/arch/arm/mach-at91/pm.c
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@@ -589,7 +589,7 @@ static const struct of_device_id ramc_ph
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{ /* Sentinel. */ },
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};
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-static __init void at91_dt_ramc(bool phy_mandatory)
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+static __init int at91_dt_ramc(bool phy_mandatory)
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{
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struct device_node *np;
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const struct of_device_id *of_id;
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@@ -625,12 +625,18 @@ static __init void at91_dt_ramc(bool phy
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/* Lookup for DDR PHY node, if any. */
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for_each_matching_node_and_match(np, ramc_phy_ids, &of_id) {
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soc_pm.data.ramc_phy = of_iomap(np, 0);
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- if (!soc_pm.data.ramc_phy)
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- panic(pr_fmt("unable to map ramc phy cpu registers\n"));
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+ if (!soc_pm.data.ramc_phy) {
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+ pr_err("unable to map ramc phy cpu registers\n");
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+ ret = -ENOMEM;
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+ goto unmap_ramc;
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+ }
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}
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- if (phy_mandatory && !soc_pm.data.ramc_phy)
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- panic(pr_fmt("DDR PHY is mandatory!\n"));
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+ if (phy_mandatory && !soc_pm.data.ramc_phy) {
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+ pr_err("DDR PHY is mandatory!\n");
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+ ret = -ENODEV;
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+ goto unmap_ramc;
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+ }
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if (!standby) {
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pr_warn("ramc no standby function available\n");
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@@ -1163,13 +1169,17 @@ void __init sama7_pm_init(void)
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[AT91_PM_BACKUP] = AT91_PM_IOMAP(SFRBU) |
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AT91_PM_IOMAP(SHDWC),
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};
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+ int ret;
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if (!IS_ENABLED(CONFIG_SOC_SAMA7))
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return;
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at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
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- at91_dt_ramc(true);
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+ ret = at91_dt_ramc(true);
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+ if (ret)
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+ return;
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+
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at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
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at91_pm_init(NULL);
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