linux-kernel - Re: [PATCH v4 6/7] drm/panthor: Support GPU_CONTROL cache flush based on feature bit

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Message-ID: <03504c08-b84a-4b6f-babb-e9909743b5fd@arm.com>
Date: Mon, 21 Jul 2025 12:35:13 +0100
From: Karunika Choo <karunika.choo@....com>
To: Chia-I Wu <olvaffe@...il.com>
Cc: dri-devel@...ts.freedesktop.org, nd@....com,
 Boris Brezillon <boris.brezillon@...labora.com>,
 Steven Price <steven.price@....com>, Liviu Dudau <liviu.dudau@....com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 6/7] drm/panthor: Support GPU_CONTROL cache flush based
 on feature bit

On 11/06/2025 00:42, Chia-I Wu wrote:
> On Mon, Jun 2, 2025 at 7:42 AM Karunika Choo <karunika.choo@....com> wrote:
>>
>> As the FLUSH_MEM and FLUSH_PT commands are deprecated in GPUs from
>> Mali-Gx20 onwards, this patch adds support for performing cache
>> maintenance via the FLUSH_CACHES command in GPU_CONTROL, in place of
>> FLUSH_MEM and FLUSH_PT based on PANTHOR_HW_FEATURE_GPU_CTRL_CACHE_FLUSH
>> feature bit.
>>
>> This patch also enables cache maintenance via GPU_CONTROL for Mali-Gx10
>> and Mali-Gx15 GPUs for consistency.
>>
>> Signed-off-by: Karunika Choo <karunika.choo@....com>
>> ---
>>  drivers/gpu/drm/panthor/panthor_hw.c  |  6 +++++
>>  drivers/gpu/drm/panthor/panthor_hw.h  |  6 +++++
>>  drivers/gpu/drm/panthor/panthor_mmu.c | 35 +++++++++++++++++++++++++++
>>  3 files changed, 47 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/panthor/panthor_hw.c b/drivers/gpu/drm/panthor/panthor_hw.c
>> index f5127a4b02dc..5ec9d7f28368 100644
>> --- a/drivers/gpu/drm/panthor/panthor_hw.c
>> +++ b/drivers/gpu/drm/panthor/panthor_hw.c
>> @@ -99,9 +99,15 @@ static void panthor_hw_info_init(struct panthor_device *ptdev)
>>  static struct panthor_hw panthor_hw_devices[] = {
>>         {
>>                 .arch_major = 10,
>> +               .features = {
>> +                       BIT(PANTHOR_HW_FEATURE_GPU_CTRL_CACHE_FLUSH)
>> +               },
>>         },
>>         {
>>                 .arch_major = 11,
>> +               .features = {
>> +                       BIT(PANTHOR_HW_FEATURE_GPU_CTRL_CACHE_FLUSH)
>> +               },
>>         },
>>  };
> Are there going to be major archs which do not support
> PANTHOR_HW_FEATURE_GPU_CTRL_CACHE_FLUSH?  If not, we don't need the
> feature bit.
I have removed the feature bits and applied the change to all CSF GPUs
in v5.
- https://lore.kernel.org/all/20250721111344.1610250-6-karunika.choo@arm.com/