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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-31c23006d72sm5202274a91.1.2025.07.11.17.58.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Jul 2025 17:58:30 -0700 (PDT) From: Jessica Zhang Date: Fri, 11 Jul 2025 17:58:08 -0700 Subject: [PATCH 03/19] drm/msm/dp: Return early from atomic_enable() if cable is not connected 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: <20250711-hpd-refactor-v1-3-33cbac823f34@oss.qualcomm.com> References: <20250711-hpd-refactor-v1-0-33cbac823f34@oss.qualcomm.com> In-Reply-To: <20250711-hpd-refactor-v1-0-33cbac823f34@oss.qualcomm.com> To: Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Jessica Zhang Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Yongxing Mou X-Mailer: b4 0.15-dev-a9b2a X-Developer-Signature: v=1; a=ed25519-sha256; t=1752281905; l=1248; i=jessica.zhang@oss.qualcomm.com; s=20230329; h=from:subject:message-id; bh=yTgqnB2dprf/Nj1ZzdiqTo9frUxLDJhIMuoIkqdGswI=; b=yjOQEw8i14tfTRd06tsg94/QUzhqjZkPogQvCBkFcs9cMN7ePscuKKGEamrhgXNfxOaO1Hkxl z+N10idpSCiD1fACySqT60gko49fsibuORGnQlrCHdURey5hsdsSXbA X-Developer-Key: i=jessica.zhang@oss.qualcomm.com; a=ed25519; pk=gAUCgHZ6wTJOzQa3U0GfeCDH7iZLlqIEPo4rrjfDpWE= X-Authority-Analysis: v=2.4 cv=P7o6hjAu c=1 sm=1 tr=0 ts=6871b338 cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=EUspDBNiAAAA:8 a=ONubTFmf6e6OPp213KoA:9 a=QEXdDO2ut3YA:10 a=uKXjsCUrEbL0IQVhDsJ9:22 X-Proofpoint-ORIG-GUID: zuAs8tvsA8pj1ij31pHQZmYsp7emmGKs X-Proofpoint-GUID: zuAs8tvsA8pj1ij31pHQZmYsp7emmGKs X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzEyMDAwNSBTYWx0ZWRfX8oRMLdSN+JSg anhcWZ3I0RjZS3I5ODwUInH4z6GPrElTJ8rZkRKVeXlR8IN7aaPuwjOinNldMhAJfo7GQ6h+VF7 jKwwZSLMDRqjEpb+ncAC0ewhtD5iBBlk+3CK35MEPkuIzz6EhlbH1YsoXCuMIgYucKtYNeMBidu PDJ4sc4tX6UWU+D02MFJrpg9uf/y9taMd2iuto4qVqdSPhJqeHD8AWTWe8TCW8sFTFIAjjRIDow quDNeFHXZAM3oFST7+s8jPoF7PABeahOEvzH9tShKVBIM/TjeBOR5LeVNWg/idTNsjkhtZxkLrg ccJouo7TSkdWZtgVAl5lKk6wQC4TKQ8d9dR7t7f1OBidk1i9qaHq2qhJE/BbqLT/HBQlz+ep80z Umqd36YnmH7x6lSDX37YH+GsUhnyomII4hOs7zHUYhwgYoi3wvpNn1pXjkhhS9R0QPw7Uo+R X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-11_07,2025-07-09_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 phishscore=0 bulkscore=0 mlxscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 adultscore=0 mlxlogscore=999 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507120005 Replace the ST_MAINLINK_READY check here with a check for if the cable is not connected. Since atomic_check() fails if the link isn't ready, we technically don't need a check against ST_MAINLINK_READY. The hpd_state should also never really hit ST_DISPLAY_OFF since atomic_enable() shouldn't be called twice in a row without an atomic_enable() in between. That being said, it is possible for the cable to be disconnected after atomic_check() but before atomic_enable(). So let's change this check to guard against msm_dp::connected instead. Signed-off-by: Jessica Zhang --- drivers/gpu/drm/msm/dp/dp_display.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/d= p_display.c index 1072b5fc00ae..fe38ea868eda 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -1606,7 +1606,7 @@ void msm_dp_bridge_atomic_enable(struct drm_bridge *d= rm_bridge, } =20 hpd_state =3D msm_dp_display->hpd_state; - if (hpd_state !=3D ST_DISPLAY_OFF && hpd_state !=3D ST_MAINLINK_READY) { + if (!dp->connected) { mutex_unlock(&msm_dp_display->event_mutex); return; } --=20 2.50.1