[PATCH v8 7/7] drm/mediatek: set dpi pin mode to gpio low to avoid leakage current

[Jitao Shi]

Config dpi pins mode to output and pull low when dpi is disabled.
Aovid leakage current from some dpi pins (Hsync Vsync DE ... ).

Signed-off-by: Jitao Shi <jitao....@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c 
b/drivers/gpu/drm/mediatek/mtk_dpi.c
index db3272f7a4c4..d6a570c03ee9 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -10,7 +10,9 @@
 #include <linux/kernel.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/of_graph.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/types.h>
 
@@ -74,6 +76,9 @@ struct mtk_dpi {
        enum mtk_dpi_out_yc_map yc_map;
        enum mtk_dpi_out_bit_num bit_num;
        enum mtk_dpi_out_channel_swap channel_swap;
+       struct pinctrl *pinctrl;
+       struct pinctrl_state *pins_gpio;
+       struct pinctrl_state *pins_dpi;
        int refcount;
        u32 pclk_sample;
 };
@@ -387,6 +392,9 @@ static void mtk_dpi_power_off(struct mtk_dpi *dpi)
        if (--dpi->refcount != 0)
                return;
 
+       if (dpi->pinctrl && dpi->pins_gpio)
+               pinctrl_select_state(dpi->pinctrl, dpi->pins_gpio);
+
        mtk_dpi_disable(dpi);
        clk_disable_unprepare(dpi->pixel_clk);
        clk_disable_unprepare(dpi->engine_clk);
@@ -411,6 +419,9 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
                goto err_pixel;
        }
 
+       if (dpi->pinctrl && dpi->pins_dpi)
+               pinctrl_select_state(dpi->pinctrl, dpi->pins_dpi);
+
        mtk_dpi_enable(dpi);
        return 0;
 
@@ -719,6 +730,25 @@ static int mtk_dpi_probe(struct platform_device *pdev)
        of_property_read_u32_index(dev->of_node, "pclk-sample", 1,
                                   &dpi->pclk_sample);
 
+       dpi->pinctrl = devm_pinctrl_get(&pdev->dev);
+       if (IS_ERR(dpi->pinctrl)) {
+               dpi->pinctrl = NULL;
+               dev_dbg(&pdev->dev, "Cannot find pinctrl!\n");
+       }
+       dpi->pins_gpio = pinctrl_lookup_state(dpi->pinctrl, "gpiomode");
+       if (IS_ERR(dpi->pins_gpio)) {
+               dpi->pins_gpio = NULL;
+               dev_dbg(&pdev->dev, "Cannot find pinctrl gpiomode!\n");
+       }
+       if (dpi->pinctrl && dpi->pins_gpio)
+               pinctrl_select_state(dpi->pinctrl, dpi->pins_gpio);
+
+       dpi->pins_dpi = pinctrl_lookup_state(dpi->pinctrl, "dpimode");
+       if (IS_ERR(dpi->pins_dpi)) {
+               dpi->pins_dpi = NULL;
+               dev_dbg(&pdev->dev, "Cannot find pinctrl dpimode!\n");
+       }
+
        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        dpi->regs = devm_ioremap_resource(dev, mem);
        if (IS_ERR(dpi->regs)) {
-- 
2.21.0
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