[PATCH] drm/msm/dpu: make error messages at dpu_core_irq_register_callback() more sensible

[Marijn Suijten]

On 2024-03-30 11:31:37, Marijn Suijten wrote:
> On 2024-03-30 05:53:22, Dmitry Baryshkov wrote:
> > There is little point in using %ps to print a value known to be NULL. On
> > the other hand it makes sense to print the callback symbol in the
> > 'invalid IRQ' message. Correct those two error messages to make more
> > sense.
> > 
> > Fixes: 6893199183f8 ("drm/msm/dpu: stop using raw IRQ indices in the kernel output")
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> 
> Agreed, this is a lot more clear:
> 
> Reviewed-by: Marijn Suijten <marijn.suijten at somainline.org>

Note that, as seen in [1], there are still a few codepaths that only print
"invalid IRQ" without any additional context (if we could even add it - __func__
might be a good start) and inconsistently use DPU_ERROR vs pr_err too :/

Any possibility to address that?

- Marijn

[1]: https://lore.kernel.org/linux-arm-msm/mxwrvnqth5f2vd4m55ryzqgyj7brykiqynzldelanxkuj2zny3@4pqi6p57c2q2/

> > ---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> > index 946dd0135dff..6a0a74832fb6 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> > @@ -525,14 +525,14 @@ int dpu_core_irq_register_callback(struct dpu_kms *dpu_kms,
> >  	int ret;
> >  
> >  	if (!irq_cb) {
> > -		DPU_ERROR("invalid IRQ=[%d, %d] irq_cb:%ps\n",
> > -			  DPU_IRQ_REG(irq_idx), DPU_IRQ_BIT(irq_idx), irq_cb);
> > +		DPU_ERROR("IRQ=[%d, %d] NULL callback\n",
> > +			  DPU_IRQ_REG(irq_idx), DPU_IRQ_BIT(irq_idx));
> >  		return -EINVAL;
> >  	}
> >  
> >  	if (!dpu_core_irq_is_valid(irq_idx)) {
> > -		DPU_ERROR("invalid IRQ=[%d, %d]\n",
> > -			  DPU_IRQ_REG(irq_idx), DPU_IRQ_BIT(irq_idx));
> > +		DPU_ERROR("invalid IRQ=[%d, %d] irq_cb:%ps\n",
> > +			  DPU_IRQ_REG(irq_idx), DPU_IRQ_BIT(irq_idx), irq_cb);
> >  		return -EINVAL;
> >  	}
> >  
> > 
> > ---
> > base-commit: 13ee4a7161b6fd938aef6688ff43b163f6d83e37
> > change-id: 20240330-dpu-irq-messages-5cf13fd7568c
> > 
> > Best regards,
> > -- 
> > Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> >