Re: [PATCH] drm/msm/mdp5: enable clocks in hw_init and set_irqmask

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On 08/26/2015 08:42 PM, hali@xxxxxxxxxxxxxx wrote:
2015-08-26 9:55 GMT-04:00  <hali@xxxxxxxxxxxxxx>:
Hi Archit,

mdp5_hw_init and mdp5_set_irqmask configure registers but may not have
clocks enabled.

Add mdp5_enable/disable calls in these funcs to ensure clocks are
enabled. We need this until we get proper runtime pm support.

Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
---
  drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c | 10 ++++++++--
  drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c |  2 ++
  2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
index b1f73be..9fabfca 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
@@ -24,9 +24,15 @@
  void mdp5_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
               uint32_t old_irqmask)
  {
-     mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_MDP_INTR_CLEAR(0),
+     struct mdp5_kms *mdp5_kms = to_mdp5_kms(mdp_kms);
+
+     mdp5_enable(mdp5_kms);
+
+     mdp5_write(mdp5_kms, REG_MDP5_MDP_INTR_CLEAR(0),
               irqmask ^ (irqmask & old_irqmask));
-     mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_MDP_INTR_EN(0),
irqmask);
+     mdp5_write(mdp5_kms, REG_MDP5_MDP_INTR_EN(0), irqmask);
+
+     mdp5_disable(mdp5_kms);
  }

mdp5_set_irqmask() can be invoked in atomic context, clk_prepare() is
not
allowed in this function because it may cause process to sleep. We can
enable the clocks in the caller at initialization.

Oh, oops. I missed that.


iirc, it will be called with at least one spinlock held..

We do already move the enable/disable_vblank() paths off to a worker
so that we can ensure things are enabled before we get into
update_irq()..  the only other path to update_irq() should be when
driver code does mdp_irq_register/unregister().. so maybe we should
just require that the mdp4/mdp5 kms code only calls those when clk's
are already enabled (which should be mostly true already, I think)

BR,
-R

Yes, the only case that not been covered is mdp5_irq_postinstall(). We can
enable clocks in this function. Actually, this is what we are doing in
downstream test.

It works fine if I put it in postinstall. I'll update the patch and resend.

Thanks,
Archit



  static void mdp5_irq_error_handler(struct mdp_irq *irq, uint32_t
irqstatus)
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index 047cb04..2b760f5 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -32,6 +32,7 @@ static int mdp5_hw_init(struct msm_kms *kms)
       unsigned long flags;

       pm_runtime_get_sync(dev->dev);
+     mdp5_enable(mdp5_kms);

       /* Magic unknown register writes:
        *
@@ -63,6 +64,7 @@ static int mdp5_hw_init(struct msm_kms *kms)

       mdp5_ctlm_hw_reset(mdp5_kms->ctlm);

+     mdp5_disable(mdp5_kms);
       pm_runtime_put_sync(dev->dev);

       return 0;
--
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