Re: [PATCH v2 03/12] drm/exynos: Use regular fbdev I/O helpers

[Thomas Zimmermann <tzimmermann@suse.de>]

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Hi Sam

Am 15.05.23 um 19:43 schrieb Sam Ravnborg:
> Hi Thomas,
> 
> On Mon, May 15, 2023 at 11:40:24AM +0200, Thomas Zimmermann wrote:
>> Use the regular fbdev helpers for framebuffer I/O instead of DRM's
>> helpers. Exynos does not use damage handling, so DRM's fbdev helpers
>> are mere wrappers around the fbdev code.
>>
>> By using fbdev helpers directly within each DRM fbdev emulation,
>> we can eventually remove DRM's wrapper functions entirely.
>>
>> v2:
>> 	* use FB_IO_HELPERS option
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> Cc: Inki Dae <inki.dae@samsung.com>
>> Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
>> Cc: Kyungmin Park <kyungmin.park@samsung.com>
>> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Cc: Alim Akhtar <alim.akhtar@samsung.com>
>> ---
>>   drivers/gpu/drm/exynos/Kconfig            |  1 +
>>   drivers/gpu/drm/exynos/Makefile           |  2 +-
>>   drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 10 +++++-----
>>   3 files changed, 7 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
>> index 0cb92d651ff1..7ca7e1dab52c 100644
>> --- a/drivers/gpu/drm/exynos/Kconfig
>> +++ b/drivers/gpu/drm/exynos/Kconfig
>> @@ -7,6 +7,7 @@ config DRM_EXYNOS
>>   	select DRM_DISPLAY_HELPER if DRM_EXYNOS_DP
>>   	select DRM_KMS_HELPER
>>   	select VIDEOMODE_HELPERS
>> +	select FB_IO_HELPERS if DRM_FBDEV_EMULATION
>>   	select SND_SOC_HDMI_CODEC if SND_SOC
>>   	help
>>   	  Choose this option if you have a Samsung SoC Exynos chipset.
>> diff --git a/drivers/gpu/drm/exynos/Makefile b/drivers/gpu/drm/exynos/Makefile
>> index 2fd2f3ee4fcf..233a66036584 100644
>> --- a/drivers/gpu/drm/exynos/Makefile
>> +++ b/drivers/gpu/drm/exynos/Makefile
>> @@ -6,7 +6,6 @@
>>   exynosdrm-y := exynos_drm_drv.o exynos_drm_crtc.o exynos_drm_fb.o \
>>   		exynos_drm_gem.o exynos_drm_plane.o exynos_drm_dma.o
>>   
>> -exynosdrm-$(CONFIG_DRM_FBDEV_EMULATION) += exynos_drm_fbdev.o
>>   exynosdrm-$(CONFIG_DRM_EXYNOS_FIMD)	+= exynos_drm_fimd.o
>>   exynosdrm-$(CONFIG_DRM_EXYNOS5433_DECON)	+= exynos5433_drm_decon.o
>>   exynosdrm-$(CONFIG_DRM_EXYNOS7_DECON)	+= exynos7_drm_decon.o
>> @@ -23,5 +22,6 @@ exynosdrm-$(CONFIG_DRM_EXYNOS_ROTATOR)	+= exynos_drm_rotator.o
>>   exynosdrm-$(CONFIG_DRM_EXYNOS_SCALER)	+= exynos_drm_scaler.o
>>   exynosdrm-$(CONFIG_DRM_EXYNOS_GSC)	+= exynos_drm_gsc.o
>>   exynosdrm-$(CONFIG_DRM_EXYNOS_MIC)     += exynos_drm_mic.o
>> +exynosdrm-$(CONFIG_DRM_FBDEV_EMULATION)	+= exynos_drm_fbdev.o
> What does this change do?
> Maybe something that was left by accident?

It reorders the statements alphabetically. I can remove this, if unwanted.

Best regards
Thomas

> 
> 	Sam
> 
>>   
>>   obj-$(CONFIG_DRM_EXYNOS)		+= exynosdrm.o
>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
>> index ea4b3d248aac..b3333dd1d087 100644
>> --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
>> +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
>> @@ -8,6 +8,8 @@
>>    *	Seung-Woo Kim <sw0312.kim@samsung.com>
>>    */
>>   
>> +#include <linux/fb.h>
>> +
>>   #include <drm/drm_crtc_helper.h>
>>   #include <drm/drm_drv.h>
>>   #include <drm/drm_fb_helper.h>
>> @@ -49,11 +51,9 @@ static const struct fb_ops exynos_drm_fb_ops = {
>>   	.owner		= THIS_MODULE,
>>   	DRM_FB_HELPER_DEFAULT_OPS,
>>   	.fb_mmap        = exynos_drm_fb_mmap,
>> -	.fb_read	= drm_fb_helper_cfb_read,
>> -	.fb_write	= drm_fb_helper_cfb_write,
>> -	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
>> -	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
>> -	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
>> +	.fb_fillrect	= cfb_fillrect,
>> +	.fb_copyarea	= cfb_copyarea,
>> +	.fb_imageblit	= cfb_imageblit,
>>   	.fb_destroy	= exynos_drm_fb_destroy,
>>   };
>>   
>> -- 
>> 2.40.1

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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