linux-kernel - [PATCH v2 3/3] power: reset: nvmem-reboot-mode: fix write for small cells

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Message-ID: <20241024154050.3245228-4-jberring@redhat.com>
Date: Thu, 24 Oct 2024 11:40:50 -0400
From: Jennifer Berringer <jberring@...hat.com>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Sebastian Reichel <sre@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Maxime Ripard <mripard@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	Jennifer Berringer <jberring@...hat.com>
Subject: [PATCH v2 3/3] power: reset: nvmem-reboot-mode: fix write for small cells

Some devices, such as Qualcomm sa8775p, have an nvmem reboot mode cell
that is smaller than 32 bits, which resulted in
nvmem_reboot_mode_write() failing. Using nvmem_cell_write_variable_u32()
fixes this by writing only the least-significant byte of the magic value
when the size specified in device tree is only one byte.

Signed-off-by: Jennifer Berringer <jberring@...hat.com>
---
 drivers/power/reset/nvmem-reboot-mode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/reset/nvmem-reboot-mode.c b/drivers/power/reset/nvmem-reboot-mode.c
index 41530b70cfc4..b52eb879d1c1 100644
--- a/drivers/power/reset/nvmem-reboot-mode.c
+++ b/drivers/power/reset/nvmem-reboot-mode.c
@@ -24,7 +24,7 @@ static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot,
 
 	nvmem_rbm = container_of(reboot, struct nvmem_reboot_mode, reboot);
 
-	ret = nvmem_cell_write(nvmem_rbm->cell, &magic, sizeof(magic));
+	ret = nvmem_cell_write_variable_u32(nvmem_rbm->cell, magic);
 	if (ret < 0)
 		dev_err(reboot->dev, "update reboot mode bits failed\n");
 
-- 
2.46.2