[PATCH v6 05/11] drm/hisilicon: Add vblank driver for ADE
Xinliang Liu
xinliang.liu at linaro.org
Wed Mar 2 23:52:34 PST 2016
On 1 March 2016 at 20:40, Archit Taneja <architt at codeaurora.org> wrote:
>
>
> On 3/1/2016 3:44 PM, Xinliang Liu wrote:
>>
>> Hi,
>>
>> On 1 March 2016 at 02:48, Archit Taneja <architt at codeaurora.org> 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 at linaro.org>
>>>> ---
>>>> 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.
>
>
> Sure, as long as this has been discussed before.
>
>
>>
>>>
>>>
>>>> + 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.
>>
>
> Yes. In any case, you should use IRQF_SHARED and not DRIVER_IRQ_SHARED
> in the call to devm_request_irq(). The latter is a drm flag meant to be
> used only for driver_features.
agree, will fix in next version.
>
> Thanks,
> Archit
>
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
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