From: Dave Gerlach d-gerlach@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@ti.com Signed-off-by: Darren Etheridge detheridge@ti.com Signed-off-by: Jyri Sarha jsarha@ti.com --- drivers/gpu/drm/tilcdc/tilcdc_drv.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c index 2b2780e..146399a 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c @@ -18,6 +18,7 @@ /* LCDC DRM driver, based on da8xx-fb */
#include <linux/component.h> +#include <linux/pinctrl/consumer.h> #include <linux/suspend.h>
#include "tilcdc_drv.h" @@ -601,6 +602,9 @@ 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; }
@@ -610,6 +614,9 @@ 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))