Re: [PATCH v9 5/5] drm/mediatek: set dpi pin mode to gpio low to avoid leakage current
From: CK Hu <hidden>
Date: 2020-02-26 08:13:04
Also in:
dri-devel, linux-arm-kernel, linux-mediatek, lkml
Hi, Jitao: On Wed, 2020-02-26 at 13:32 +0800, Jitao Shi wrote:
Config dpi pins mode to output and pull low when dpi is disabled. Aovid leakage current from some dpi pins (Hsync Vsync DE ... ).
Reviewed-by: CK Hu <redacted>
quoted hunk ↗ jump to hunk
Signed-off-by: Jitao Shi <redacted> --- drivers/gpu/drm/mediatek/mtk_dpi.c | 31 ++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c index db3272f7a4c4..ae4c6308bb68 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 +730,26 @@ 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"); + } + if (dpi->pinctrl) { + 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->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)) {