Re: [PATCH 05/21] drm/atmel-hlcdc: Use GEM CMA object functions

From: Sam Ravnborg <sam@ravnborg.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
Cc: alexandre.belloni@bootlin.com, linux-aspeed@lists.ozlabs.org,
	narmstrong@baylibre.com, airlied@linux.ie, liviu.dudau@arm.com,
	philippe.cornu@st.com, paul@crapouillou.net,
	laurent.pinchart@ideasonboard.com, mihail.atanassov@arm.com,
	alexandre.torgue@st.com, marex@denx.de, khilman@baylibre.com,
	abrodkin@synopsys.com, ludovic.desroches@microchip.com,
	xinliang.liu@linaro.org, kong.kongxinwei@hisilicon.com,
	tomi.valkeinen@ti.com, james.qian.wang@arm.com, joel@jms.id.au,
	linux-imx@nxp.com, puck.chen@hisilicon.com,
	s.hauer@pengutronix.de, alison.wang@nxp.com, jsarha@ti.com,
	wens@csie.org, vincent.abriou@st.com, kernel@pengutronix.de,
	linux-arm-kernel@lists.infradead.org, mcoquelin.stm32@gmail.com,
	bbrezillon@kernel.org, andrew@aj.id.au,
	dri-devel@lists.freedesktop.org, nicolas.ferre@microchip.com,
	yannick.fertre@st.com, kieran.bingham+renesas@ideasonboard.com,
	zourongrong@gmail.com, shawnguo@kernel.org
Subject: Re: [PATCH 05/21] drm/atmel-hlcdc: Use GEM CMA object functions
Date: Fri, 22 May 2020 21:25:46 +0200	[thread overview]
Message-ID: <20200522192546.GA1516695@ravnborg.org> (raw)
In-Reply-To: <20200522135246.10134-6-tzimmermann@suse.de>

Hi Thomas.

On Fri, May 22, 2020 at 03:52:30PM +0200, Thomas Zimmermann wrote:
> The atmel-hlcdc driver uses the default implementation for CMA functions. The
> DRM_GEM_CMA_DRIVER_OPS macro now sets these defaults in struct drm_driver.
> All remaining operations are provided by CMA GEM object functions.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 11 +----------
>  1 file changed, 1 insertion(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index 112aa5066ceed..871293d1aeeba 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -821,16 +821,7 @@ static struct drm_driver atmel_hlcdc_dc_driver = {
>  	.irq_preinstall = atmel_hlcdc_dc_irq_uninstall,
>  	.irq_postinstall = atmel_hlcdc_dc_irq_postinstall,
>  	.irq_uninstall = atmel_hlcdc_dc_irq_uninstall,
> -	.gem_free_object_unlocked = drm_gem_cma_free_object,
> -	.gem_vm_ops = &drm_gem_cma_vm_ops,
> -	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> -	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> -	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
> -	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> -	.gem_prime_vmap = drm_gem_cma_prime_vmap,
> -	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,

> -	.gem_prime_mmap = drm_gem_cma_prime_mmap,
When using DRM_GEM_CMA_DRIVER_OPS gem_prime_mmap is set to
drm_gem_prime_mmap.
Why is this the same as drm_gem_cma_prime_mmap?

Maybe this is all obvious when you know all the CMA stuff,
but this puzzeled me.

	Sam

> -	.dumb_create = drm_gem_cma_dumb_create,
> +	DRM_GEM_CMA_DRIVER_OPS,
>  	.fops = &fops,
>  	.name = "atmel-hlcdc",
>  	.desc = "Atmel HLCD Controller DRM",
> -- 
> 2.26.2
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel