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Fri, 03 Sep 2021 10:59:00 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id A92B410002A; Fri, 3 Sep 2021 10:58:57 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 7A9752171FD; Fri, 3 Sep 2021 10:58:57 +0200 (CEST) Received: from SFHDAG2NODE3.st.com (10.75.127.6) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 3 Sep 2021 10:58:56 +0200 Received: from SFHDAG2NODE3.st.com ([fe80::31b3:13bf:2dbe:f64c]) by SFHDAG2NODE3.st.com ([fe80::31b3:13bf:2dbe:f64c%20]) with mapi id 15.00.1497.015; Fri, 3 Sep 2021 10:58:56 +0200 From: Raphael GALLAIS-POU - foss To: Yannick FERTRE - foss , Philippe CORNU - foss , Benjamin Gaignard CC: David Airlie , Daniel Vetter , "Maxime Coquelin" , Alexandre TORGUE - foss , "dri-devel@lists.freedesktop.org" , "linux-stm32@st-md-mailman.stormreply.com" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Raphael GALLAIS-POU - foss , Raphael GALLAIS-POU Subject: [PATCH] drm/stm: ltdc: add layer alpha support Thread-Topic: [PATCH] drm/stm: ltdc: add layer alpha support Thread-Index: AQHXoKHtnlZSU/d2YES0y3Gmjn+IKg== Date: Fri, 3 Sep 2021 08:58:56 +0000 Message-ID: <20210903085740.23108-1-raphael.gallais-pou@foss.st.com> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.75.127.46] MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-09-03_02,2021-09-03_01,2020-04-07_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210903_015912_101628_E7669EA0 X-CRM114-Status: GOOD ( 17.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Android Hardware Composer supports alpha values applied to layers. Enabling non-opaque layers for the STM CRTC could help offload GPU resources for screen composition. Signed-off-by: Raphael Gallais-Pou Acked-by: Yannick Fertre Reviewed-by: Yannick Fertre --- drivers/gpu/drm/stm/ltdc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index 195de30eb90c..e0fef8bacfa8 100644 --- a/drivers/gpu/drm/stm/ltdc.c +++ b/drivers/gpu/drm/stm/ltdc.c @@ -845,7 +845,7 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane, LXCFBLR_CFBLL | LXCFBLR_CFBP, val); /* Specifies the constant alpha value */ - val = CONSTA_MAX; + val = newstate->alpha >> 8; reg_update_bits(ldev->regs, LTDC_L1CACR + lofs, LXCACR_CONSTA, val); /* Specifies the blending factors */ @@ -997,6 +997,8 @@ static struct drm_plane *ltdc_plane_create(struct drm_device *ddev, drm_plane_helper_add(plane, <dc_plane_helper_funcs); + drm_plane_create_alpha_property(plane); + DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id); return plane;