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([2804:431:c7f4:b20b:2ce0:3c04:a56a:40cc]) by smtp.gmail.com with ESMTPSA id j64sm9736221vkc.6.2021.10.18.12.32.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Oct 2021 12:32:44 -0700 (PDT) Subject: Re: [PATCH 5/6] drm: vkms: Prepare `vkms_wb_encoder_atomic_check` to accept multiple formats To: Thomas Zimmermann , rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com Cc: hamohammed.sa@gmail.com, daniel@ffwll.ch, airlied@linux.ie, contact@emersion.fr, leandro.ribeiro@collabora.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20211005201637.58563-1-igormtorrente@gmail.com> <20211005201637.58563-6-igormtorrente@gmail.com> <5507450a-eb69-b24c-9f43-a1780dafbfa9@suse.de> <9dbd2c55-2c29-eb12-94d0-dbd5110c302e@suse.de> From: Igor Matheus Andrade Torrente Message-ID: <4d573cd9-ac1b-59d6-fb97-e5c24152892b@gmail.com> Date: Mon, 18 Oct 2021 16:32:40 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <9dbd2c55-2c29-eb12-94d0-dbd5110c302e@suse.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Thomas, On 10/18/21 3:06 PM, Thomas Zimmermann wrote: > Hi > > Am 18.10.21 um 19:41 schrieb Igor Matheus Andrade Torrente: >> Hello, >> >> On 10/18/21 7:14 AM, Thomas Zimmermann wrote: >>> Hi >>> >>> Am 05.10.21 um 22:16 schrieb Igor Matheus Andrade Torrente: >>>> Currently, the vkms atomic check only goes through the first >>>> position of >>>> the `vkms_wb_formats` vector. >>>> >>>> This change prepares the atomic_check to check the entire vector. >>>> >>>> Signed-off-by: Igor Matheus Andrade Torrente >>>> --- >>>>   drivers/gpu/drm/vkms/vkms_writeback.c | 11 ++++++++++- >>>>   1 file changed, 10 insertions(+), 1 deletion(-) >>>> >>>> diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c >>>> b/drivers/gpu/drm/vkms/vkms_writeback.c >>>> index 5a3e12f105dc..56978f499203 100644 >>>> --- a/drivers/gpu/drm/vkms/vkms_writeback.c >>>> +++ b/drivers/gpu/drm/vkms/vkms_writeback.c >>>> @@ -30,6 +30,8 @@ static int vkms_wb_encoder_atomic_check(struct >>>> drm_encoder *encoder, >>>>   { >>>>       struct drm_framebuffer *fb; >>>>       const struct drm_display_mode *mode = &crtc_state->mode; >>>> +    bool format_supported = false; >>>> +    int i; >>>>       if (!conn_state->writeback_job || !conn_state->writeback_job->fb) >>>>           return 0; >>>> @@ -41,7 +43,14 @@ static int vkms_wb_encoder_atomic_check(struct >>>> drm_encoder *encoder, >>>>           return -EINVAL; >>>>       } >>>> -    if (fb->format->format != vkms_wb_formats[0]) { >>>> +    for (i = 0; i < ARRAY_SIZE(vkms_wb_formats); i++) { >>>> +        if (fb->format->format == vkms_wb_formats[i]) { >>>> +            format_supported = true; >>>> +            break; >>>> +        } >>>> +    } >>> >>> At a minimum, this loop should be in a helper function. But more >>> generally, I'm surprised that this isn't already covered by the DRM's >>> atomic helpers. >> >> Ok, I can wrap it in a new function. >> >> AFAIK the DRM doesn't cover it. But I may be wrong... > > I couldn't find anything either. > > Other drivers do similar format and frambuffer checks. So I guess a > helper could be implemented. All plane's are supposed to call > drm_atomic_helper_check_plane_state() in their atomic_check() code. You > could add a similar helper, say > drm_atomic_helper_check_writeback_encoder_state(), that tests for the > format and maybe other things as well. Do you think this should be done before or after this patch series? > > Best regards > Thomas > >> >>> >>> Best regards >>> Thomas >>> >>>> + >>>> +    if (!format_supported) { >>>>           DRM_DEBUG_KMS("Invalid pixel format %p4cc\n", >>>>                     &fb->format->format); >>>>           return -EINVAL; >>>> >>> > Thanks, Igor Torrente