diff mbox series

[v9,02/22] pinctrl: tegra: Flush pinctrl writes during resume

Message ID 1565984527-5272-3-git-send-email-skomatineni@nvidia.com (mailing list archive)
State Not Applicable, archived
Headers show
Series SC7 entry and exit support for Tegra210 | expand

Commit Message

Sowjanya Komatineni Aug. 16, 2019, 7:41 p.m. UTC 
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>
---
 drivers/pinctrl/tegra/pinctrl-tegra.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Linus Walleij Aug. 18, 2019, 10:20 p.m. UTC | #1 
On Fri, Aug 16, 2019 at 9:42 PM Sowjanya Komatineni
<skomatineni@nvidia.com> wrote:

> 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>

Patch applied.

Yours,
Linus Walleij
diff mbox series

Patch

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;
 }