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[2001:14ba:a0c3:3a00:264b:feff:fe8b:be8a]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-333f8cec11asm1720061fa.23.2025.08.14.02.03.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Aug 2025 02:03:56 -0700 (PDT) From: Dmitry Baryshkov Date: Thu, 14 Aug 2025 12:03:52 +0300 Subject: [PATCH 1/2] drm/msm/dpu: simplify bg_alpha selection Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250814-dpu-rework-alpha-v1-1-b4baa4ffa8fe@oss.qualcomm.com> References: <20250814-dpu-rework-alpha-v1-0-b4baa4ffa8fe@oss.qualcomm.com> In-Reply-To: <20250814-dpu-rework-alpha-v1-0-b4baa4ffa8fe@oss.qualcomm.com> To: Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1778; i=dmitry.baryshkov@oss.qualcomm.com; h=from:subject:message-id; bh=iMJRmARhSb1qXSk4SUYiXVNL3suv0fUyow+jfxnnJDQ=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBonaZ5C08EvEWaNICCToRqfci+V/llxHEZsK7d6 VHKUWQyiSWJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCaJ2meQAKCRCLPIo+Aiko 1aECCACyvWUX7kkfk8qmbd/L2OFNGcQOvCZ5c/p3qwoUvB2bm1hsP8Ggmq3+xYl6tpyuNmTjgSx xLpBlujHfcCypZG5gRrjLcoCwaiy5ixvxUvUweo/kZ3eHHgIXQUPglVwY4oHBqgCWl4AEf1XT9L v/00spXJh6cfVYBhs+txtWUk5P1DIUNcccPAqcn8wskRcEYrzBpfQA6XZe5LAqN7Bhi/HeYhqfA /kmU5irHbeOX+C4Sq+nBdwZIxdqCD6ZRKpF42JPYXfN9tOb2wxJySN9FWeg0wHHqd/dRChrtXap waRolPzQ5Lxh21Hfzx7eg8hC+iSHSIxAR+xBGBwAMSWrSTjT X-Developer-Key: i=dmitry.baryshkov@oss.qualcomm.com; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODExMDA3NSBTYWx0ZWRfXzC3LPdilflbf YvUfxj6dyYdpnOdcn9Bs5btG9yDpEjYKJKaMwFMVsx6jbCqr+LSP19epR5h9qNFWnwZMchwJBjk LVqFvl04/D3DLVDIbx/5dZip5sVUmj/6wJr/Zs5YUgqprQ5XrZ66/cmc+sqo1QgpjKTQeW2uYqB ejSv4dvDCVqBRhVbBrw5Pp6ld+qvxo8GlxOKZ6fmZuPc5g/yFBdCo8Bj7Ov83QZiSl4t/1a2oB0 RZUNs21UIdwxP4cZIHhITbQFPAXyJ4N9S7HlBsv7zBJ1EOcxgbClssnpxaHtD4gowH+knKFhCe6 Uru6B0xLs7fmmEeCZlYznESewt7zOblhgXE86M/yoS5K+dP1p3LPUc9/SoY9vB8tzS7RhSG9Uqw 5HLMHL4n X-Authority-Analysis: v=2.4 cv=TLZFS0la c=1 sm=1 tr=0 ts=689da67f cx=c_pps a=JbAStetqSzwMeJznSMzCyw==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=EUspDBNiAAAA:8 a=ID75BBqnTVE1V_rUnp8A:9 a=QEXdDO2ut3YA:10 a=uxP6HrT_eTzRwkO_Te1X:22 X-Proofpoint-GUID: USUV-EEe2AJOi0qBZlyozxotVbiTDsbk X-Proofpoint-ORIG-GUID: USUV-EEe2AJOi0qBZlyozxotVbiTDsbk X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-13_02,2025-08-11_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 malwarescore=0 spamscore=0 priorityscore=1501 bulkscore=0 adultscore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508110075 In order to be more obvious in fg_alpha / bg_alpha handling during the blending programming drop the default setting for background alpha value and set it explicitly in all cases. Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm= /disp/dpu1/dpu_crtc.c index d4b545448d74657aafc96e9042c7756654b4f0e7..651159e8731194d75b52c05158b= fd1c9bad8b10c 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c @@ -335,13 +335,13 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc= _mixer *mixer, max_alpha =3D 0x3ff; fg_alpha =3D pstate->base.alpha >> 6; } - bg_alpha =3D max_alpha - fg_alpha; =20 /* default to opaque blending */ if (pstate->base.pixel_blend_mode =3D=3D DRM_MODE_BLEND_PIXEL_NONE || !format->alpha_enable) { blend_op =3D DPU_BLEND_FG_ALPHA_FG_CONST | DPU_BLEND_BG_ALPHA_BG_CONST; + bg_alpha =3D max_alpha - fg_alpha; } else if (pstate->base.pixel_blend_mode =3D=3D DRM_MODE_BLEND_PREMULTI) { blend_op =3D DPU_BLEND_FG_ALPHA_FG_CONST | DPU_BLEND_BG_ALPHA_FG_PIXEL; @@ -350,6 +350,7 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_m= ixer *mixer, blend_op |=3D DPU_BLEND_BG_MOD_ALPHA | DPU_BLEND_BG_INV_MOD_ALPHA; } else { + bg_alpha =3D 0; blend_op |=3D DPU_BLEND_BG_INV_ALPHA; } } else { @@ -363,6 +364,7 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_m= ixer *mixer, DPU_BLEND_BG_MOD_ALPHA | DPU_BLEND_BG_INV_MOD_ALPHA; } else { + bg_alpha =3D 0; blend_op |=3D DPU_BLEND_BG_INV_ALPHA; } } --=20 2.47.2