Hi,
On 1 March 2016 at 02:48, Archit Taneja <architt@xxxxxxxxxxxxxx> wrote:
>
>
> On 2/26/2016 2:10 PM, Xinliang Liu wrote:
>>
>> Add vblank irq handle.
>>
>> v6: None.
>> v5: None.
>> v4: None.
>> v3:
>> - Remove hisi_get_crtc_from_index func.
>> - A few cleanup.
>> v2:
>> - Remove abtraction layer.
>>
>> Signed-off-by: Xinliang Liu <xinliang.liu@xxxxxxxxxx>
>> ---
>> drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c | 62
>> +++++++++++++++++++++++++
>> drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 14 +++++-
>> 2 files changed, 75 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
>> b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
>> index aa2cf75cab39..749382952ab7 100644
>> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
>> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
>> @@ -292,6 +292,59 @@ static void ade_set_medianoc_qos(struct ade_crtc
>> *acrtc)
>> SOCKET_QOS_EN, SOCKET_QOS_EN);
>> }
>>
>> +static int ade_enable_vblank(struct drm_device *dev, unsigned int pipe)
>> +{
>> + struct kirin_drm_private *priv = dev->dev_private;
>> + struct ade_crtc *acrtc = to_ade_crtc(priv->crtc[pipe]);
>> + struct ade_hw_ctx *ctx = acrtc->ctx;
>> + void __iomem *base = ctx->base;
>> +
>> + if (!ctx->power_on)
>> + (void)ade_power_up(ctx);
>> +
>> + ade_update_bits(base + LDI_INT_EN, FRAME_END_INT_EN_OFST,
>> + MASK(1), 1);
>> +
>> + return 0;
>> +}
>> +
>> +static void ade_disable_vblank(struct drm_device *dev, unsigned int pipe)
>> +{
>> + struct kirin_drm_private *priv = dev->dev_private;
>> + struct ade_crtc *acrtc = to_ade_crtc(priv->crtc[pipe]);
>> + struct ade_hw_ctx *ctx = acrtc->ctx;
>> + void __iomem *base = ctx->base;
>> +
>> + if (!ctx->power_on) {
>> + DRM_ERROR("power is down! vblank disable fail\n");
>> + return;
>> + }
>> +
>> + ade_update_bits(base + LDI_INT_EN, FRAME_END_INT_EN_OFST,
>> + MASK(1), 0);
>> +}
>> +
>> +static irqreturn_t ade_irq_handler(int irq, void *data)
>> +{
>> + struct ade_crtc *acrtc = data;
>> + struct ade_hw_ctx *ctx = acrtc->ctx;
>> + struct drm_crtc *crtc = &acrtc->base;
>> + void __iomem *base = ctx->base;
>> + u32 status;
>> +
>> + status = readl(base + LDI_MSK_INT);
>> + DRM_DEBUG_VBL("LDI IRQ: status=0x%X\n", status);
>> +
>> + /* vblank irq */
>> + if (status & BIT(FRAME_END_INT_EN_OFST)) {
>> + ade_update_bits(base + LDI_INT_CLR, FRAME_END_INT_EN_OFST,
>> + MASK(1), 1);
>> + drm_crtc_handle_vblank(crtc);
>> + }
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> static void ade_display_enable(struct ade_crtc *acrtc)
>> {
>> struct ade_hw_ctx *ctx = acrtc->ctx;
>> @@ -967,6 +1020,15 @@ int ade_drm_init(struct drm_device *dev)
>> if (ret)
>> return ret;
>>
>> + /* vblank irq init */
>> + ret = devm_request_irq(dev->dev, ctx->irq, ade_irq_handler,
>> + DRIVER_IRQ_SHARED, dev->driver->name,
>> acrtc);
>
>
> This isn't the way we set up interrupts for kms drivers. We need to
> provide the handler in drm_driver and call drm_irq_install.
I prefer to set up interrupts here for two reasons.
One is that it is easy to pass any interrupt private "void * data" to
the interrupt handler here.
As I discussed with Daniel Vetter before: https://lkml.org/lkml/2015/9/10/204.
Second is setting up interrupt here in the specific SoC display
controller driver, make other SoC reuse the kirin_drm_drv.c code
easily.
Different Hisilicon SoC may has different display controller interrupts.
>
>
>> + if (ret)
>> + return ret;
>> + dev->driver->get_vblank_counter = drm_vblank_no_hw_counter;
>> + dev->driver->enable_vblank = ade_enable_vblank;
>> + dev->driver->disable_vblank = ade_disable_vblank;
>> +
>> return 0;
>> }
>>
>> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
>> b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
>> index 055729c1889c..723888feb760 100644
>> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
>> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
>> @@ -32,6 +32,7 @@ static int kirin_drm_kms_cleanup(struct drm_device *dev)
>> {
>> struct kirin_drm_private *priv = dev->dev_private;
>>
>> + drm_vblank_cleanup(dev);
>> dc_ops->cleanup(dev);
>> drm_mode_config_cleanup(dev);
>> devm_kfree(dev->dev, priv);
>> @@ -85,11 +86,22 @@ static int kirin_drm_kms_init(struct drm_device *dev)
>> goto err_dc_cleanup;
>> }
>>
>> + /* vblank init */
>> + ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
>> + if (ret) {
>> + DRM_ERROR("failed to initialize vblank.\n");
>> + goto err_unbind_all;
>> + }
>> + /* with irq_enabled = true, we can use the vblank feature. */
>> + dev->irq_enabled = true;
>> +
>> /* reset all the states of crtc/plane/encoder/connector */
>> drm_mode_config_reset(dev);
>>
>> return 0;
>>
>> +err_unbind_all:
>> + component_unbind_all(dev->dev, dev);
>> err_dc_cleanup:
>> dc_ops->cleanup(dev);
>> err_mode_config_cleanup:
>> @@ -123,7 +135,7 @@ static int kirin_gem_cma_dumb_create(struct drm_file
>> *file,
>>
>> static struct drm_driver kirin_drm_driver = {
>> .driver_features = DRIVER_GEM | DRIVER_MODESET |
>> DRIVER_PRIME |
>> - DRIVER_ATOMIC,
>> + DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
>
>
> DRIVER_IRQ_SHARED should be added here if you want IRQF_SHARED flag set
> when requesting the handler.
If not using the drm_irq_install to set up interrupts,
DRIVER_IRQ_SHARED may not be required to set.
Thanks,
-xinliang
>
> Archit
>
>> .fops = &kirin_drm_fops,
>> .set_busid = drm_platform_set_busid,
>>
>>
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
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