[PATCH v1 0/2] reset: small cleanups for x86

[PATCH v1 0/2] reset: small cleanups for x86

[Denis Mukhin via U-Boot]

This is small cleanup series for x86 reset device driver.

Patch 1 introduces a small fixup for the x86 reset driver.
Patch 2 introduces a small fixup for the x86 EFI reset driver.

Denis Mukhin (2):
  reset: x86: Use cpu_hlt() in pch_sysreset_power_off()
  reset: x86: Use cpu_hlt() in efi_reset_system()

 drivers/sysreset/sysreset_x86.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

-- 
2.54.0

[PATCH v1 1/2] reset: x86: Use cpu_hlt() in pch_sysreset_power_off()

[Denis Mukhin via U-Boot]

From: Denis Mukhin <dmukhin@ford.com> 

Use cpu_hlt() instead of open-coded "hlt" in pch_sysreset_power_off().

Signed-off-by: Denis Mukhin <dmukhin@ford.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
Original patch: https://lore.kernel.org/u-boot/20260603070743.1268544-5-dmukhin@ford.com/
---
 drivers/sysreset/sysreset_x86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/sysreset/sysreset_x86.c b/drivers/sysreset/sysreset_x86.c
index c2f28c65280f..05a3ff9c8363 100644
--- a/drivers/sysreset/sysreset_x86.c
+++ b/drivers/sysreset/sysreset_x86.c
@@ -65,7 +65,7 @@ int pch_sysreset_power_off(struct udevice *dev)
 	outl(reg32, pm.base + pm.pm1_cnt_ofs);
 
 	for (;;)
-		asm("hlt");
+		cpu_hlt();
 }
 
 static int x86_sysreset_request(struct udevice *dev, enum sysreset_t type)
-- 
2.54.0

[PATCH v1 2/2] reset: x86: Use cpu_hlt() in efi_reset_system()

[Denis Mukhin via U-Boot]

From: Denis Mukhin <dmukhin@ford.com> 

Use cpu_hlt() in busy loop in efi_reset_system() similarly to
pch_sysreset_power_off().

Note, this is safe for __efi_runtime-annotated efi_reset_system(),
because cpu_hlt() expands to a bare "hlt".

Signed-off-by: Denis Mukhin <dmukhin@ford.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
Original patch: https://lore.kernel.org/u-boot/20260603070743.1268544-6-dmukhin@ford.com/ 
---
 drivers/sysreset/sysreset_x86.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/sysreset/sysreset_x86.c b/drivers/sysreset/sysreset_x86.c
index 05a3ff9c8363..afb77d9c5c21 100644
--- a/drivers/sysreset/sysreset_x86.c
+++ b/drivers/sysreset/sysreset_x86.c
@@ -120,7 +120,8 @@ void __efi_runtime EFIAPI efi_reset_system(
 
 	/* TODO EFI_RESET_SHUTDOWN */
 
-	while (1) { }
+	for (;;)
+		cpu_hlt();
 }
 #endif
 
-- 
2.54.0

Re: [PATCH v1 0/2] reset: small cleanups for x86

[dmukhin]

On Wed, Jul 29, 2026 at 01:38:24AM -0700, Denis Mukhin via U-Boot wrote:
> This is small cleanup series for x86 reset device driver.
> 
> Patch 1 introduces a small fixup for the x86 reset driver.
> Patch 2 introduces a small fixup for the x86 EFI reset driver.
> 
> Denis Mukhin (2):
>   reset: x86: Use cpu_hlt() in pch_sysreset_power_off()
>   reset: x86: Use cpu_hlt() in efi_reset_system()
> 
>  drivers/sysreset/sysreset_x86.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

Just following up on that mini-cleanup series.

This is re-submission of the reviewed patches originally posted here:

  https://lore.kernel.org/u-boot/20260603070743.1268544-5-dmukhin@ford.com/
  https://lore.kernel.org/u-boot/20260603070743.1268544-6-dmukhin@ford.com/

Thanks,
Denis