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 <treding@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Link: https://lore.kernel.org/r/1565984527-5272-3-git-send-email-skomatineni@nvidia.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
index 5e3c00137d713d4f00a39eccc3e10315807e6bab..e9a7cbb9aa33692a0ad7349dcb1966eb494d66d4 100644 (file)
--- 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;
 }