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power: reset: at91-reset: Optimize at91_reset()

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[ Upstream commit 62d48983f2 ]

This patch adds a small optimization to the low-level at91_reset()
function, which includes:
- Removes the extra branch, since the following store operations
  already have proper condition checks.
- Removes the definition of the clobber register r4, since it is
  no longer used in the code.

Fixes: fcd0532fac ("power: reset: at91-reset: make at91sam9g45_restart() generic")
Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20250307053809.20245-1-eagle.alexander923@gmail.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Shiyan
2025-03-07 08:38:09 +03:00
committed by Greg Kroah-Hartman
parent c6c1422679
commit d46af758f6
1 changed files with 2 additions and 3 deletions
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drivers/power/reset/at91-reset.c
+2 -3
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@@ -129,12 +129,11 @@ static int at91_reset(struct notifier_block *this, unsigned long mode,
" str %4, [%0, %6]\n\t" " str %4, [%0, %6]\n\t"
/* Disable SDRAM1 accesses */ /* Disable SDRAM1 accesses */
"1: tst %1, #0\n\t" "1: tst %1, #0\n\t"
" beq 2f\n\t"
" strne %3, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" " strne %3, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t"
/* Power down SDRAM1 */ /* Power down SDRAM1 */
" strne %4, [%1, %6]\n\t" " strne %4, [%1, %6]\n\t"
/* Reset CPU */ /* Reset CPU */
"2: str %5, [%2, #" __stringify(AT91_RSTC_CR) "]\n\t" " str %5, [%2, #" __stringify(AT91_RSTC_CR) "]\n\t"
" b .\n\t" " b .\n\t"
: :
@@ -145,7 +144,7 @@ static int at91_reset(struct notifier_block *this, unsigned long mode,
"r" cpu_to_le32(AT91_DDRSDRC_LPCB_POWER_DOWN), "r" cpu_to_le32(AT91_DDRSDRC_LPCB_POWER_DOWN),
"r" (reset->data->reset_args), "r" (reset->data->reset_args),
"r" (reset->ramc_lpr) "r" (reset->ramc_lpr)
: "r4"); );
return NOTIFY_DONE; return NOTIFY_DONE;
} }