From: Jitao Shi <jitao.shi@mediatek.com>
To: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
<dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>
Cc: devicetree@vger.kernel.org, Jitao Shi <jitao.shi@mediatek.com>,
srv_heupstream@mediatek.com, huijuan.xie@mediatek.com,
stonea168@163.com, cawa.cheng@mediatek.com,
linux-mediatek@lists.infradead.org, yingjoe.chen@mediatek.com,
eddie.huang@mediatek.com, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v9 5/5] drm/mediatek: set dpi pin mode to gpio low to avoid leakage current
Date: Wed, 26 Feb 2020 13:32:38 +0800 [thread overview]
Message-ID: <20200226053238.31646-6-jitao.shi@mediatek.com> (raw)
In-Reply-To: <20200226053238.31646-1-jitao.shi@mediatek.com>
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.shi@mediatek.com>
---
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)) {
--
2.21.0
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next prev parent reply other threads:[~2020-02-26 5:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 5:32 [PATCH v9 0/5] mt8183 dpi supports dual edge and pin mode swap Jitao Shi
2020-02-26 5:32 ` [PATCH v9 1/5] dt-bindings: media: add pclk-sample dual edge property Jitao Shi
2020-02-27 17:15 ` Rob Herring
2020-02-26 5:32 ` [PATCH v9 2/5] dt-bindings: display: mediatek: control dpi pins mode to avoid leakage Jitao Shi
2020-02-27 17:18 ` Rob Herring
2020-02-26 5:32 ` [PATCH v9 3/5] dt-bindings: display: mediatek: dpi sample data in dual edge support Jitao Shi
2020-02-26 8:11 ` CK Hu
2020-02-27 17:19 ` Rob Herring
2020-02-26 5:32 ` [PATCH v9 4/5] drm/mediatek: dpi sample mode support Jitao Shi
2020-02-26 5:32 ` Jitao Shi [this message]
2020-02-26 8:12 ` [PATCH v9 5/5] drm/mediatek: set dpi pin mode to gpio low to avoid leakage current CK Hu
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