linux-kernel - [PATCH 5.15 034/779] riscv: set default pm_power

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Date:   Mon, 15 Aug 2022 19:54:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dimitri John Ledkov <dimitri.ledkov@...onical.com>,
        Anup Patel <anup@...infault.org>,
        Ron Economos <w6rz@...cast.net>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 5.15 034/779] riscv: set default pm_power_off to NULL

From: Dimitri John Ledkov <dimitri.ledkov@...onical.com>

commit f2928e224d85e7cc139009ab17cefdfec2df5d11 upstream.

Set pm_power_off to NULL like on all other architectures, check if it
is set in machine_halt() and machine_power_off() and fallback to
default_power_off if no other power driver got registered.

This brings riscv architecture inline with all other architectures,
and allows to reuse exiting power drivers unmodified.

Kernels without legacy SBI v0.1 extensions (CONFIG_RISCV_SBI_V01 is
not set), do not set pm_power_off to sbi_shutdown(). There is no
support for SBI v0.3 system reset extension either. This prevents
using gpio_poweroff on SiFive HiFive Unmatched.

Tested on SiFive HiFive unmatched, with a dtb specifying gpio-poweroff
node and kernel complied without CONFIG_RISCV_SBI_V01.

BugLink: https://bugs.launchpad.net/bugs/1942806
Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@...onical.com>
Reviewed-by: Anup Patel <anup@...infault.org>
Tested-by: Ron Economos <w6rz@...cast.net>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
Cc: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/riscv/kernel/reset.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/arch/riscv/kernel/reset.c
+++ b/arch/riscv/kernel/reset.c
@@ -12,7 +12,7 @@ static void default_power_off(void)
 		wait_for_interrupt();
 }
 
-void (*pm_power_off)(void) = default_power_off;
+void (*pm_power_off)(void) = NULL;
 EXPORT_SYMBOL(pm_power_off);
 
 void machine_restart(char *cmd)
@@ -23,10 +23,16 @@ void machine_restart(char *cmd)
 
 void machine_halt(void)
 {
-	pm_power_off();
+	if (pm_power_off != NULL)
+		pm_power_off();
+	else
+		default_power_off();
 }
 
 void machine_power_off(void)
 {
-	pm_power_off();
+	if (pm_power_off != NULL)
+		pm_power_off();
+	else
+		default_power_off();
 }