6.6-stable review patch. If anyone has any objections, please let me know.
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From: Hugo Villeneuve hvilleneuve@dimonoff.com
[ Upstream commit 1c05bf6c0262f946571a37678250193e46b1ff0f ]
Commit 43c51bb573aa ("sc16is7xx: make sure device is in suspend once probed") permanently enabled access to the enhanced features in sc16is7xx_probe(), and it is never disabled after that.
Therefore, remove re-enable of enhanced features in sc16is7xx_set_baud(). This eliminates a potential useless read + write cycle each time the baud rate is reconfigured.
Fixes: 43c51bb573aa ("sc16is7xx: make sure device is in suspend once probed") Cc: stable stable@kernel.org Signed-off-by: Hugo Villeneuve hvilleneuve@dimonoff.com Link: https://patch.msgid.link/20251006142002.177475-1-hugo@hugovil.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/sc16is7xx.c | 7 ------- 1 file changed, 7 deletions(-)
--- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -582,13 +582,6 @@ static int sc16is7xx_set_baud(struct uar div /= prescaler; }
- /* Enable enhanced features */ - sc16is7xx_efr_lock(port); - sc16is7xx_port_update(port, SC16IS7XX_EFR_REG, - SC16IS7XX_EFR_ENABLE_BIT, - SC16IS7XX_EFR_ENABLE_BIT); - sc16is7xx_efr_unlock(port); - /* If bit MCR_CLKSEL is set, the divide by 4 prescaler is activated. */ sc16is7xx_port_update(port, SC16IS7XX_MCR_REG, SC16IS7XX_MCR_CLKSEL_BIT,