linux-kernel - Re: [PATCH] drm/meson: add size and alignment requirements for dumb buffers

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Message-ID: <2a9f0dcc-9136-ffbd-520e-6e323ac80dc0@baylibre.com>
Date:   Wed, 17 Apr 2019 20:27:07 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Sky Zhou <Sky.Zhou@...ogic.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Cc:     "linux-amlogic@...ts.infradead.org" 
        <linux-amlogic@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/meson: add size and alignment requirements for dumb
 buffers

On 16/04/2019 12:20, Sky Zhou wrote:
> 
> On 2019/4/8 17:01, Neil Armstrong wrote:
>> The Amlogic SoCs Canvas buffers stride must be aligned on 64bytes
>> and overall size should be aligned on PAGE width.
>>
>> Adds a custom dumb_create op to adds these requirements.
>>
>> Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")
>> Suggested-by: Sky Zhou <sky.zhou@...ogic.com>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>   drivers/gpu/drm/meson/meson_drv.c | 14 +++++++++++++-
>>   1 file changed, 13 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
>> index faf1b1b0357c..72b01e6be0d9 100644
>> --- a/drivers/gpu/drm/meson/meson_drv.c
>> +++ b/drivers/gpu/drm/meson/meson_drv.c
>> @@ -90,6 +90,18 @@ static irqreturn_t meson_irq(int irq, void *arg)
>>   	return IRQ_HANDLED;
>>   }
>>   
>> +static int meson_dumb_create(struct drm_file *file, struct drm_device *dev,
>> +			     struct drm_mode_create_dumb *args)
>> +{
>> +	/*
>> +	 * We need 64bytes aligned stride, and PAGE aligned size
>> +	 */
>> +	args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), SZ_64);
>> +	args->size = PAGE_ALIGN(args->pitch * args->height);
>> +
>> +	return drm_gem_cma_dumb_create_internal(file, dev, args);
>> +}
>> +
>>   DEFINE_DRM_GEM_CMA_FOPS(fops);
>>   
>>   static struct drm_driver meson_driver = {
>> @@ -112,7 +124,7 @@ static struct drm_driver meson_driver = {
>>   	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
>>   
>>   	/* GEM Ops */
>> -	.dumb_create		= drm_gem_cma_dumb_create,
>> +	.dumb_create		= meson_dumb_create,
>>   	.gem_free_object_unlocked = drm_gem_cma_free_object,
>>   	.gem_vm_ops		= &drm_gem_cma_vm_ops,
>>   
>>
> 
> Reviewed-by: Sky Zhou <sky.zhou@...ogic.com>
> 

Applied to drm-misc-next, thanks !