linux-kernel - Re: [PATCH v2 6/7] media: hantro: Move VP8 common code

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Date:   Thu, 25 Jul 2019 13:38:19 -0300
From:   Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     linux-media@...r.kernel.org, Hans Verkuil <hans.verkuil@...co.com>,
        kernel@...labora.com,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Tomasz Figa <tfiga@...omium.org>,
        linux-rockchip@...ts.infradead.org,
        Heiko Stuebner <heiko@...ech.de>,
        Jonas Karlman <jonas@...boo.se>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        fbuergisser@...omium.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/7] media: hantro: Move VP8 common code

Em Thu, 25 Jul 2019 13:30:07 -0300
Ezequiel Garcia <ezequiel@...labora.com> escreveu:

> On Thu, 2019-07-25 at 13:22 -0300, Mauro Carvalho Chehab wrote:
> > Em Thu, 25 Jul 2019 11:17:55 -0300
> > Ezequiel Garcia <ezequiel@...labora.com> escreveu:
> >   
> > > In order to introduce support for RK3399 VP8 decoding,
> > > move some common VP8 code. This will be reused by
> > > the RK3399 implementation, reducing code duplication.
> > > 
> > > Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> > > ---
> > >  .../staging/media/hantro/hantro_g1_vp8_dec.c    | 17 -----------------
> > >  drivers/staging/media/hantro/hantro_hw.h        |  4 ++++
> > >  drivers/staging/media/hantro/hantro_vp8.c       | 15 +++++++++++++++
> > >  3 files changed, 19 insertions(+), 17 deletions(-)
> > > 
> > > diff --git a/drivers/staging/media/hantro/hantro_g1_vp8_dec.c b/drivers/staging/media/hantro/hantro_g1_vp8_dec.c
> > > index cd1fbd3a0d5f..181e2f76d8cb 100644
> > > --- a/drivers/staging/media/hantro/hantro_g1_vp8_dec.c
> > > +++ b/drivers/staging/media/hantro/hantro_g1_vp8_dec.c
> > > @@ -16,8 +16,6 @@
> > >  #include "hantro.h"
> > >  #include "hantro_g1_regs.h"
> > >  
> > > -#define DEC_8190_ALIGN_MASK	0x07U
> > > -
> > >  /* DCT partition base address regs */
> > >  static const struct hantro_reg vp8_dec_dct_base[8] = {
> > >  	{ G1_REG_ADDR_STR, 0, 0xffffffff },
> > > @@ -131,21 +129,6 @@ static const struct hantro_reg vp8_dec_pred_bc_tap[8][4] = {
> > >  	},
> > >  };
> > >  
> > > -/*
> > > - * filter taps taken to 7-bit precision,
> > > - * reference RFC6386#Page-16, filters[8][6]
> > > - */
> > > -static const u32 vp8_dec_mc_filter[8][6] = {
> > > -	{ 0, 0, 128, 0, 0, 0 },
> > > -	{ 0, -6, 123, 12, -1, 0 },
> > > -	{ 2, -11, 108, 36, -8, 1 },
> > > -	{ 0, -9, 93, 50, -6, 0 },
> > > -	{ 3, -16, 77, 77, -16, 3 },
> > > -	{ 0, -6, 50, 93, -9, 0 },
> > > -	{ 1, -8, 36, 108, -11, 2 },
> > > -	{ 0, -1, 12, 123, -6, 0 }
> > > -};
> > > -
> > >  /*
> > >   * Set loop filters
> > >   */
> > > diff --git a/drivers/staging/media/hantro/hantro_hw.h b/drivers/staging/media/hantro/hantro_hw.h
> > > index 34ef24e3a9ef..185e27d47e47 100644
> > > --- a/drivers/staging/media/hantro/hantro_hw.h
> > > +++ b/drivers/staging/media/hantro/hantro_hw.h
> > > @@ -15,6 +15,8 @@
> > >  #include <media/vp8-ctrls.h>
> > >  #include <media/videobuf2-core.h>
> > >  
> > > +#define DEC_8190_ALIGN_MASK	0x07U
> > > +
> > >  struct hantro_dev;
> > >  struct hantro_ctx;
> > >  struct hantro_buf;
> > > @@ -93,6 +95,8 @@ extern const struct hantro_variant rk3399_vpu_variant;
> > >  extern const struct hantro_variant rk3328_vpu_variant;
> > >  extern const struct hantro_variant rk3288_vpu_variant;
> > >  
> > > +extern const u32 vp8_dec_mc_filter[8][6];  
> > 
> > Please don't do that, as a symbol like that can easily cause
> > namespace clashes in the future. For all exported symbols,
> > please prepend the driver name, like:
> > 
> > 	hantro_vp8_dec_mc_filter
> >   
> 
> Right. Would you be OK, with taking Hans' PR and accept a follow-up
> patch fixing this?

No need. I went ahead and applied a fixup. Just remember about that
next time, as we don't want to mess with Kernel export symbol
namespace.

Thanks,
Mauro