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[PATCH v7 6/9] drm/mediatek: add dsi interrupt control

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  [PATCH v7 6/9] drm/mediatek: add dsi interrupt control YT Shen <yt.shen@mediatek.com> - 2016-09-02 13:30 +0200
    Re: [PATCH v7 6/9] drm/mediatek: add dsi interrupt control CK Hu <ck.hu@mediatek.com> - 2016-09-07 03:40 +0200

#1475061 — [PATCH v7 6/9] drm/mediatek: add dsi interrupt control

From: shaoming chen <shaoming.chen@mediatek.com>

add dsi interrupt control

Signed-off-by: shaoming chen <shaoming.chen@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 76 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 4efeb38..d20f6f9 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -18,6 +18,7 @@
 #include <drm/drm_panel.h>
 #include <linux/clk.h>
 #include <linux/component.h>
+#include <linux/irq.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/of_graph.h>
@@ -29,6 +30,17 @@
 
 #define DSI_START		0x00
 
+#define DSI_INTEN		0x08
+
+#define DSI_INTSTA		0x0c
+#define LPRX_RD_RDY_INT_FLAG		BIT(0)
+#define CMD_DONE_INT_FLAG		BIT(1)
+#define TE_RDY_INT_FLAG			BIT(2)
+#define VM_DONE_INT_FLAG		BIT(3)
+#define EXT_TE_RDY_INT_FLAG		BIT(4)
+#define DSI_INT_ALL_BITS		0x1f
+#define DSI_BUSY			BIT(31)
+
 #define DSI_CON_CTRL		0x10
 #define DSI_RESET			BIT(0)
 #define DSI_EN				BIT(1)
@@ -71,6 +83,9 @@
 
 #define DSI_HSTX_CKL_WC		0x64
 
+#define DSI_RACK		0x84
+#define RACK				BIT(0)
+
 #define DSI_PHY_LCCON		0x104
 #define LC_HS_TX_EN			BIT(0)
 #define LC_ULPM_EN			BIT(1)
@@ -131,8 +146,11 @@ struct mtk_dsi {
 	struct videomode vm;
 	int refcount;
 	bool enabled;
+	u32 irq_data;
 };
 
+static wait_queue_head_t _dsi_irq_wait_queue;
+
 static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
 {
 	return container_of(e, struct mtk_dsi, encoder);
@@ -437,6 +455,43 @@ static void mtk_dsi_start(struct mtk_dsi *dsi)
 	writel(1, dsi->regs + DSI_START);
 }
 
+static void mtk_dsi_set_interrupt_enable(struct mtk_dsi *dsi)
+{
+	u32 inten = DSI_INT_ALL_BITS;
+
+	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO)
+		inten &= ~(TE_RDY_INT_FLAG | EXT_TE_RDY_INT_FLAG);
+
+	writel(inten, dsi->regs + DSI_INTEN);
+}
+
+static void mtk_dsi_irq_data_set(struct mtk_dsi *dsi, u32 irq_bit)
+{
+	dsi->irq_data |= irq_bit;
+}
+
+static irqreturn_t mtk_dsi_irq(int irq, void *dev_id)
+{
+	struct mtk_dsi *dsi = dev_id;
+	u32 status, tmp;
+	u32 flag = LPRX_RD_RDY_INT_FLAG | CMD_DONE_INT_FLAG | VM_DONE_INT_FLAG;
+
+	status = readl(dsi->regs + DSI_INTSTA);
+
+	if (status & flag) {
+		do {
+			mtk_dsi_mask(dsi, DSI_RACK, RACK, RACK);
+			tmp = readl(dsi->regs + DSI_INTSTA);
+		} while (tmp & DSI_BUSY);
+
+		mtk_dsi_mask(dsi, DSI_INTSTA, status & flag, 0);
+		mtk_dsi_irq_data_set(dsi, status & flag);
+		wake_up_interruptible(&_dsi_irq_wait_queue);
+	}
+
+	return IRQ_HANDLED;
+}
+
 static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
 {
 	if (WARN_ON(dsi->refcount == 0))
@@ -485,6 +540,7 @@ static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
 
 	mtk_dsi_ps_control_vact(dsi);
 	mtk_dsi_config_vdo_timing(dsi);
+	mtk_dsi_set_interrupt_enable(dsi);
 
 	mtk_dsi_set_mode(dsi);
 	mtk_dsi_clk_hs_mode(dsi, 1);
@@ -793,6 +849,7 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *remote_node, *endpoint;
 	struct resource *regs;
+	int irq_num;
 	int comp_id;
 	int ret;
 
@@ -869,8 +926,27 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	irq_num = platform_get_irq(pdev, 0);
+	if (irq_num < 0) {
+		dev_err(&pdev->dev, "failed to request dsi irq resource\n");
+		return -EPROBE_DEFER;
+	}
+
+	irq_set_status_flags(irq_num, IRQ_TYPE_LEVEL_LOW);
+	ret = devm_request_irq(&pdev->dev, irq_num, mtk_dsi_irq,
+			       IRQF_TRIGGER_LOW, dev_name(&pdev->dev), dsi);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to request mediatek dsi irq\n");
+		return -EPROBE_DEFER;
+	}
+
+	dsi->irq_data = 0;
+	dev_info(dev, "dsi irq num is 0x%x\n", irq_num);
+
 	platform_set_drvdata(pdev, dsi);
 
+	init_waitqueue_head(&_dsi_irq_wait_queue);
+
 	return component_add(&pdev->dev, &mtk_dsi_component_ops);
 }
 
-- 
1.9.1

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#1477918

Hi, YT:

On Fri, 2016-09-02 at 19:24 +0800, YT Shen wrote:
> From: shaoming chen <shaoming.chen@mediatek.com>
> 
> add dsi interrupt control
> 
> Signed-off-by: shaoming chen <shaoming.chen@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 76 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 76 insertions(+)
> 

[snip...]

>  
> +static wait_queue_head_t _dsi_irq_wait_queue;

I think it's better to move this global variable into platform driver
data. Maybe one day you have two dsi device and one global variable is
not enough.

> +

[snip...]

> +
> +static irqreturn_t mtk_dsi_irq(int irq, void *dev_id)
> +{
> +	struct mtk_dsi *dsi = dev_id;
> +	u32 status, tmp;
> +	u32 flag = LPRX_RD_RDY_INT_FLAG | CMD_DONE_INT_FLAG | VM_DONE_INT_FLAG;
> +
> +	status = readl(dsi->regs + DSI_INTSTA);

If you define as

status = readl(dsi->regs + DSI_INTSTA) & flag;

You can remove 'flag' in below statements and reduce code size.

> +
> +	if (status & flag) {
> +		do {
> +			mtk_dsi_mask(dsi, DSI_RACK, RACK, RACK);
> +			tmp = readl(dsi->regs + DSI_INTSTA);
> +		} while (tmp & DSI_BUSY);
> +
> +		mtk_dsi_mask(dsi, DSI_INTSTA, status & flag, 0);
> +		mtk_dsi_irq_data_set(dsi, status & flag);
> +		wake_up_interruptible(&_dsi_irq_wait_queue);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +

[snip...]

>  
> @@ -869,8 +926,27 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	irq_num = platform_get_irq(pdev, 0);
> +	if (irq_num < 0) {
> +		dev_err(&pdev->dev, "failed to request dsi irq resource\n");
> +		return -EPROBE_DEFER;
> +	}
> +
> +	irq_set_status_flags(irq_num, IRQ_TYPE_LEVEL_LOW);
> +	ret = devm_request_irq(&pdev->dev, irq_num, mtk_dsi_irq,
> +			       IRQF_TRIGGER_LOW, dev_name(&pdev->dev), dsi);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to request mediatek dsi irq\n");
> +		return -EPROBE_DEFER;
> +	}
> +
> +	dsi->irq_data = 0;

You use devm_kzalloc() to allocate 'dsi', so this statement is
redundant.

> +	dev_info(dev, "dsi irq num is 0x%x\n", irq_num);
> +
>  	platform_set_drvdata(pdev, dsi);
>  
> +	init_waitqueue_head(&_dsi_irq_wait_queue);
> +
>  	return component_add(&pdev->dev, &mtk_dsi_component_ops);
>  }


Regards,
CK 

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