Nouveau - Dec 2019 - [PATCH] drm/nouveau: remove set but unused variable.

The local variable `pclks` is defined and set but not used and can
therefore be removed.
Issue found by coccinelle.

Signed-off-by: Wambui Karuga <wambui.karugax at gmail.com>
---
 drivers/gpu/drm/nouveau/dispnv04/arb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv04/arb.c
b/drivers/gpu/drm/nouveau/dispnv04/arb.c
index 362495535e69..f607a04d262d 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/arb.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/arb.c
@@ -54,7 +54,7 @@ static void
 nv04_calc_arb(struct nv_fifo_info *fifo, struct nv_sim_state *arb)
 {
 	int pagemiss, cas, width, bpp;
-	int nvclks, mclks, pclks, crtpagemiss;
+	int nvclks, mclks, crtpagemiss;
 	int found, mclk_extra, mclk_loop, cbs, m1, p1;
 	int mclk_freq, pclk_freq, nvclk_freq;
 	int us_m, us_n, us_p, crtc_drain_rate;
@@ -69,7 +69,6 @@ nv04_calc_arb(struct nv_fifo_info *fifo, struct nv_sim_state
*arb)
 	bpp = arb->bpp;
 	cbs = 128;
 
-	pclks = 2;
 	nvclks = 10;
 	mclks = 13 + cas;
 	mclk_extra = 3;
-- 
2.17.1

On Tue, Dec 31, 2019 at 11:56:07PM +0300, Wambui Karuga
wrote:
> The local variable `pclks` is defined and set but not used and can
> therefore be removed.
> Issue found by coccinelle.
> 
> Signed-off-by: Wambui Karuga <wambui.karugax at gmail.com>
> ---
>  drivers/gpu/drm/nouveau/dispnv04/arb.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/dispnv04/arb.c
b/drivers/gpu/drm/nouveau/dispnv04/arb.c
> index 362495535e69..f607a04d262d 100644
> --- a/drivers/gpu/drm/nouveau/dispnv04/arb.c
> +++ b/drivers/gpu/drm/nouveau/dispnv04/arb.c
> @@ -54,7 +54,7 @@ static void
>  nv04_calc_arb(struct nv_fifo_info *fifo, struct nv_sim_state *arb)
>  {
>  	int pagemiss, cas, width, bpp;
> -	int nvclks, mclks, pclks, crtpagemiss;
> +	int nvclks, mclks, crtpagemiss;
Hm, reading the code (just from how stuff is named) I wonder whether the
original idea was that the calculation for us_p should us pclks, not
nvclks, but given that this code is as old as the initial nouveau merge
probably not a good idea to touch it. Plus I guess not many with a vintage
nv04 in working condition around to even test stuff ...

Ben, what should we do here?
-Daniel
>  	int found, mclk_extra, mclk_loop, cbs, m1, p1;
>  	int mclk_freq, pclk_freq, nvclk_freq;
>  	int us_m, us_n, us_p, crtc_drain_rate;
> @@ -69,7 +69,6 @@ nv04_calc_arb(struct nv_fifo_info *fifo, struct
nv_sim_state *arb)
>  	bpp = arb->bpp;
>  	cbs = 128;
>  
> -	pclks = 2;
>  	nvclks = 10;
>  	mclks = 13 + cas;
>  	mclk_extra = 3;
> -- 
> 2.17.1
> 
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

On Thu, 2 Jan 2020 at 04:48, Daniel Vetter <daniel at ffwll.ch>
wrote:
>
> On Tue, Dec 31, 2019 at 11:56:07PM +0300, Wambui Karuga wrote:
> > The local variable `pclks` is defined and set but not used and can
> > therefore be removed.
> > Issue found by coccinelle.
> >
> > Signed-off-by: Wambui Karuga <wambui.karugax at gmail.com>
> > ---
> >  drivers/gpu/drm/nouveau/dispnv04/arb.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/nouveau/dispnv04/arb.c
b/drivers/gpu/drm/nouveau/dispnv04/arb.c
> > index 362495535e69..f607a04d262d 100644
> > --- a/drivers/gpu/drm/nouveau/dispnv04/arb.c
> > +++ b/drivers/gpu/drm/nouveau/dispnv04/arb.c
> > @@ -54,7 +54,7 @@ static void
> >  nv04_calc_arb(struct nv_fifo_info *fifo, struct nv_sim_state *arb)
> >  {
> >       int pagemiss, cas, width, bpp;
> > -     int nvclks, mclks, pclks, crtpagemiss;
> > +     int nvclks, mclks, crtpagemiss;
>
> Hm, reading the code (just from how stuff is named) I wonder whether the
> original idea was that the calculation for us_p should us pclks, not
> nvclks, but given that this code is as old as the initial nouveau merge
> probably not a good idea to touch it. Plus I guess not many with a vintage
> nv04 in working condition around to even test stuff ...
>
> Ben, what should we do here?
I looked at the original code from xf86-video-nv, and pclks is
similarly unused there also, so, I'd vote for just picking up this
patch.  I don't believe anyone has the knowledge+hw anymore to mess
with it in any other way.

Ben.
> -Daniel
>
> >       int found, mclk_extra, mclk_loop, cbs, m1, p1;
> >       int mclk_freq, pclk_freq, nvclk_freq;
> >       int us_m, us_n, us_p, crtc_drain_rate;
> > @@ -69,7 +69,6 @@ nv04_calc_arb(struct nv_fifo_info *fifo, struct
nv_sim_state *arb)
> >       bpp = arb->bpp;
> >       cbs = 128;
> >
> > -     pclks = 2;
> >       nvclks = 10;
> >       mclks = 13 + cas;
> >       mclk_extra = 3;
> > --
> > 2.17.1
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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