Re: [PATCH v11 08/12] drm/mediatek: add dsi interrupt control

CK Hu
2017-01-18T06:22:06Z

Hi, YT:

On Wed, 2017-01-11 at 14:51 +0800, YT Shen wrote:
> From: shaoming chen <shaoming.chen@mediatek.com>
>
> add dsi interrupt control
>
> Signed-off-by: shaoming chen <shaoming.chen@mediatek.com>

Acked-by: CK Hu <ck.hu@mediatek.com>

> ---
> drivers/gpu/drm/mediatek/mtk_dsi.c | 92 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 92 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 6f4b3bb..474861a 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 +30,16 @@
>
> #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_BUSY BIT(31)
> +
> #define DSI_CON_CTRL 0x10
> #define DSI_RESET BIT(0)
> #define DSI_EN BIT(1)
> @@ -71,6 +82,9 @@
>
> #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)
> @@ -137,6 +151,8 @@ struct mtk_dsi {
> struct videomode vm;
> int refcount;
> bool enabled;
> + u32 irq_data;
> + wait_queue_head_t irq_wait_queue;
> };
>
> static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
> @@ -469,6 +485,64 @@ 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 = LPRX_RD_RDY_INT_FLAG | CMD_DONE_INT_FLAG | VM_DONE_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 __maybe_unused void mtk_dsi_irq_data_clear(struct mtk_dsi *dsi, u32 irq_bit)
> +{
> + dsi->irq_data &= ~irq_bit;
> +}
> +
> +static __maybe_unused s32 mtk_dsi_wait_for_irq_done(struct mtk_dsi *dsi, u32 irq_flag,
> + unsigned int timeout)
> +{
> + s32 ret = 0;
> + unsigned long jiffies = msecs_to_jiffies(timeout);
> +
> + ret = wait_event_interruptible_timeout(dsi->irq_wait_queue,
> + dsi->irq_data & irq_flag,
> + jiffies);
> + if (ret == 0) {
> + DRM_WARN("Wait DSI IRQ(0x%08x) Timeout\n", irq_flag);
> +
> + mtk_dsi_enable(dsi);
> + mtk_dsi_reset_engine(dsi);
> + }
> +
> + return ret;
> +}
> +
> +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) & flag;
> +
> + if (status) {
> + 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, 0);
> + mtk_dsi_irq_data_set(dsi, status);
> + 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))
> @@ -517,6 +591,7 @@ 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);
> @@ -818,6 +893,7 @@ 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;
>
> @@ -894,6 +970,22 @@ 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;
> + }
> +
> + init_waitqueue_head(&dsi->irq_wait_queue);
> +
> platform_set_drvdata(pdev, dsi);
>
> return component_add(&pdev->dev, &mtk_dsi_component_ops);