linux-kernel - Re: [PATCH] drm/rockchip: use generic fbdev setup

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Message-ID: <YX01C6l93I2YPgku@donbot>
Date:   Sat, 30 Oct 2021 13:05:31 +0100
From:   John Keeping <john@...anate.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     dri-devel@...ts.freedesktop.org, Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] drm/rockchip: use generic fbdev setup

Hi Thomas,

On Fri, Oct 29, 2021 at 09:00:08PM +0200, Thomas Zimmermann wrote:
> Am 29.10.21 um 13:50 schrieb John Keeping:
> > The Rockchip fbdev code does not add anything compared to
> > drm_fbdev_generic_setup(); the one custom function for .fb_mmap does the
> > same thing as gem_prime_mmap which is called by the helper.
> > 
> > Signed-off-by: John Keeping <john@...anate.com>
> > ---
> >   drivers/gpu/drm/rockchip/Makefile             |   1 -
> >   drivers/gpu/drm/rockchip/rockchip_drm_drv.c   |  10 +-
> >   drivers/gpu/drm/rockchip/rockchip_drm_drv.h   |   2 -
> >   drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c | 164 ------------------
> >   drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h |  24 ---
> >   5 files changed, 2 insertions(+), 199 deletions(-)
> >   delete mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
> >   delete mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_fbdev.h
> > 
> > diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
> > index 17a9e7eb2130..1a56f696558c 100644
> > --- a/drivers/gpu/drm/rockchip/Makefile
> > +++ b/drivers/gpu/drm/rockchip/Makefile
> > @@ -5,7 +5,6 @@
> >   rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_fb.o \
> >   		rockchip_drm_gem.o rockchip_drm_vop.o rockchip_vop_reg.o
> > -rockchipdrm-$(CONFIG_DRM_FBDEV_EMULATION) += rockchip_drm_fbdev.o
> >   rockchipdrm-$(CONFIG_ROCKCHIP_ANALOGIX_DP) += analogix_dp-rockchip.o
> >   rockchipdrm-$(CONFIG_ROCKCHIP_CDN_DP) += cdn-dp-core.o cdn-dp-reg.o
> > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> > index 69c699459dce..20d81ae69828 100644
> > --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> > @@ -26,7 +26,6 @@
> >   #include "rockchip_drm_drv.h"
> >   #include "rockchip_drm_fb.h"
> > -#include "rockchip_drm_fbdev.h"
> >   #include "rockchip_drm_gem.h"
> >   #define DRIVER_NAME	"rockchip"
> > @@ -159,10 +158,6 @@ static int rockchip_drm_bind(struct device *dev)
> >   	drm_mode_config_reset(drm_dev);
> > -	ret = rockchip_drm_fbdev_init(drm_dev);
> > -	if (ret)
> > -		goto err_unbind_all;
> > -
> >   	/* init kms poll for handling hpd */
> >   	drm_kms_helper_poll_init(drm_dev);
> > @@ -170,10 +165,11 @@ static int rockchip_drm_bind(struct device *dev)
> >   	if (ret)
> >   		goto err_kms_helper_poll_fini;
> > +	drm_fbdev_generic_setup(drm_dev, 32);
> 
> Please pass 0 for the final argument. The fbdev helpers pick 32 by default.
> Maybe leave a comment if you require 32 here.

I wanted to minimise the changes introduced here - passing 32 matches
the value passed to drm_fb_helper_initial_config() in the deleted code
from rockchip_drm_fbdev.c.

What do you think about changing this to 0 in a follow-up patch?