From: Dave Gerlach <d-gerlach@xxxxxx> 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@xxxxxx> Signed-off-by: Darren Etheridge <detheridge@xxxxxx> Signed-off-by: Jyri Sarha <jsarha@xxxxxx> --- 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 b3dbbe9..420a237 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" @@ -585,6 +587,9 @@ 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; } @@ -594,6 +599,9 @@ 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 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
