From: Dave Gerlach <d-gerl...@ti.com>
Update tilcdc driver to set the state of the pins to:
- "default on resume
- "sleep" on suspend
By optionally putting the pins into sleep state in the suspend callback
we can accomplish two things.
- minimize current leakage from pins and thus save power,
- prevent the IP from driving pins output in an uncontrolled manner,
which may happen if the power domain drops the domain regulator.
Signed-off-by: Dave Gerlach <d-gerlach at ti.com>
Signed-off-by: Darren Etheridge <detheridge at ti.com>
Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
drivers/gpu/drm/tilcdc/tilcdc_drv.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 4d75ee3..64f1de2 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -18,6 +18,8 @@
/* LCDC DRM driver, based on da8xx-fb */
#include <linux/component.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/suspend.h>
#include "tilcdc_drv.h"
#include "tilcdc_regs.h"
@@ -593,6 +595,9 @@ static int tilcdc_pm_suspend(struct device *dev)
if (registers[i].save && (priv->rev >= registers[i].rev))
priv->saved_register[n++] = tilcdc_read(ddev,
registers[i].reg);
+ /* Select sleep pin state */
+ pinctrl_pm_select_sleep_state(dev);
+
return 0;
}
@@ -602,6 +607,9 @@ static int tilcdc_pm_resume(struct device *dev)
struct tilcdc_drm_private *priv = ddev->dev_private;
unsigned i, n = 0;
+ /* Select default pin state */
+ pinctrl_pm_select_default_state(dev);
+
/* Restore register state: */
for (i = 0; i < ARRAY_SIZE(registers); i++)
if (registers[i].save && (priv->rev >= registers[i].rev))
--
1.9.1
