[PATCH v6 06/10] drm/mediatek: add dsi interrupt control

YT Shen
2016-08-04T11:16:37Z

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 a9cf5a1..eea6192 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;
+ int 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_wakeup(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_wakeup(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);
@@ -804,6 +860,7 @@ 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;

@@ -880,8 +937,27 @@ 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);
}

--
1.7.9.5