From a4873accca0529b6a32e1ceb458be843cdea9ec6 Mon Sep 17 00:00:00 2001 From: Sowjanya Komatineni Date: Fri, 16 Aug 2019 12:41:47 -0700 Subject: pinctrl: tegra: Flush pinctrl writes during resume This patch adds pinctrl register read to flush all the prior pinctrl writes and then adds barrier for pinctrl register read to complete during resume to make sure all pinctrl changes are effective. Acked-by: Thierry Reding Reviewed-by: Dmitry Osipenko Signed-off-by: Sowjanya Komatineni Link: https://lore.kernel.org/r/1565984527-5272-3-git-send-email-skomatineni@nvidia.com Signed-off-by: Linus Walleij --- drivers/pinctrl/tegra/pinctrl-tegra.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/pinctrl/tegra') diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c index 5e3c00137d71..e9a7cbb9aa33 100644 --- a/drivers/pinctrl/tegra/pinctrl-tegra.c +++ b/drivers/pinctrl/tegra/pinctrl-tegra.c @@ -677,6 +677,10 @@ static int tegra_pinctrl_resume(struct device *dev) writel_relaxed(*backup_regs++, regs++); } + /* flush all the prior writes */ + readl_relaxed(pmx->regs[0]); + /* wait for pinctrl register read to complete */ + rmb(); return 0; } -- cgit v1.2.3