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Tue, 3 Dec 2024 00:39:21 GMT Received: from abhinavk-linux1.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 2 Dec 2024 16:39:20 -0800 From: Abhinav Kumar Date: Mon, 2 Dec 2024 16:39:00 -0800 Subject: [PATCH 1/4] drm/msm/dp: remove redundant checks related to ST_DISPLAY_OFF in plug/irq_ipd handlers Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20241202-hpd_display_off-v1-1-8d0551847753@quicinc.com> References: <20241202-hpd_display_off-v1-0-8d0551847753@quicinc.com> In-Reply-To: <20241202-hpd_display_off-v1-0-8d0551847753@quicinc.com> To: Rob Clark , Dmitry Baryshkov , Sean Paul , Marijn Suijten , David Airlie , "Simona Vetter" CC: , , , Stephen Boyd , "Doug Anderson" , Johan Hovold , "Bjorn Andersson" , Abhinav Kumar X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1733186360; l=2183; i=quic_abhinavk@quicinc.com; s=20240509; h=from:subject:message-id; bh=k6S3Lu59R/9ciU62ibkq8v6vGFAAGJ1GQLJwhNWGZfY=; b=HRIUS08QeGieuPsk8SUbQeMZRovX3EJvs5R4Br5Dq16Txx4lC8iY+/Cj7VIP+lwlF7P/qBovs HPleih41xC8CfGWeY9eqMMviWJDB5LhzQCzzyY54aZxeO4wmAwuqGNq X-Developer-Key: i=quic_abhinavk@quicinc.com; a=ed25519; pk=SD3D8dOKDDh6BoX3jEYjsHrTFwuIK8+o0cLPgQok9ys= X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: wGCrok6LtKIQRxwFqoKeG7xcBgSeOM5Y X-Proofpoint-GUID: wGCrok6LtKIQRxwFqoKeG7xcBgSeOM5Y X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 priorityscore=1501 mlxlogscore=999 clxscore=1015 adultscore=0 bulkscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412030002 In commit 8ede2ecc3e5ee ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets"), checks were introduced to avoid handling any plug or irq hpd events in ST_DISPLAY_OFF state. Even if we do get hpd events, after the bridge was disabled, it should get handled. Moreover, its unclear under what circumstances these events will fire because ST_DISPLAY_OFF means that the link was still connected but only the bridge was disabled. If the link was untouched, then interrupts shouldn't fire. Even in the case of the DP compliance equipment, it should be raising these interrupts during the start of the test which is usually accompanied with either a HPD pulse or a IRQ HPD but after the bridge is disabled it should be fine to handle these anyway. In the absence of a better reason to keep these checks, drop these and if any other issues do arise, it should be handled in a different way. Signed-off-by: Abhinav Kumar Reviewed-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/dp/dp_display.c | 10 ---------- 1 file changed, 10 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index aba925aab7ad..992184cc17e4 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -562,11 +562,6 @@ static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp, u32 data) drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n", dp->msm_dp_display.connector_type, state); - if (state == ST_DISPLAY_OFF) { - mutex_unlock(&dp->event_mutex); - return 0; - } - if (state == ST_MAINLINK_READY || state == ST_CONNECTED) { mutex_unlock(&dp->event_mutex); return 0; @@ -689,11 +684,6 @@ static int msm_dp_irq_hpd_handle(struct msm_dp_display_private *dp, u32 data) drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n", dp->msm_dp_display.connector_type, state); - if (state == ST_DISPLAY_OFF) { - mutex_unlock(&dp->event_mutex); - return 0; - } - if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) { /* wait until ST_CONNECTED */ msm_dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */