From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeykumar Sankaran Subject: Re: drm/msm/dpu: Correct dpu encoder spinlock initialization Date: Mon, 24 Jun 2019 15:26:07 -0700 Message-ID: References: <1561357632-15361-1-git-send-email-dhar@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1561357632-15361-1-git-send-email-dhar@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: Shubhashree Dhar Cc: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, robdclark@gmail.com, seanpaul@chromium.org, hoegsberg@chromium.org, abhinavk@codeaurora.org, chandanu@codeaurora.org, nganji@codeaurora.org, jshekhar@codeaurora.org List-Id: devicetree@vger.kernel.org On 2019-06-23 23:27, Shubhashree Dhar wrote: > dpu encoder spinlock should be initialized during dpu encoder > init instead of dpu encoder setup which is part of commit. > There are chances that vblank control uses the uninitialized > spinlock if not initialized during encoder init. Not much can be done if someone is performing a vblank operation before encoder_setup is done. Can you point to the path where this lock is acquired before the encoder_setup? Thanks Jeykumar S. > > Change-Id: I5a18b95fa47397c834a266b22abf33a517b03a4e > Signed-off-by: Shubhashree Dhar > --- > drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c > b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c > index 5f085b5..22938c7 100644 > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c > @@ -2195,8 +2195,6 @@ int dpu_encoder_setup(struct drm_device *dev, > struct > drm_encoder *enc, > if (ret) > goto fail; > > - spin_lock_init(&dpu_enc->enc_spinlock); > - > atomic_set(&dpu_enc->frame_done_timeout, 0); > timer_setup(&dpu_enc->frame_done_timer, > dpu_encoder_frame_done_timeout, 0); > @@ -2250,6 +2248,7 @@ struct drm_encoder *dpu_encoder_init(struct > drm_device *dev, > > drm_encoder_helper_add(&dpu_enc->base, &dpu_encoder_helper_funcs); > > + spin_lock_init(&dpu_enc->enc_spinlock); > dpu_enc->enabled = false; > > return &dpu_enc->base; -- Jeykumar S