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Tue, 13 May 2025 07:10:48 -0700 (PDT) Received: from avt74j0.fritz.box ([2a02:8109:8617:d700:5ee9:d8ef:8f7d:d924]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ad2192c8f98sm800022466b.10.2025.05.13.07.10.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 May 2025 07:10:48 -0700 (PDT) From: mhecht73@googlemail.com X-Google-Original-From: mhecht73@gmail.com To: linux-media@vger.kernel.org Cc: sakari.ailus@linux.intel.com, tomm.merciai@gmail.com, martin.hecht@avnet.com, Martin Hecht Subject: [PATCH] media: i2c: alvium: Accelerated alvium_set_power Date: Tue, 13 May 2025 16:10:20 +0200 Message-ID: <20250513141019.3871882-2-mhecht73@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Martin Hecht Now alvium_set_power tests if Alvium is up and running already instead of waiting for the period of a full reboot. This safes about 7 seconds delay for each connected and already booted camera especially when using multiple Alvium cameras. Signed-off-by: Martin Hecht --- drivers/media/i2c/alvium-csi2.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c index 05b708bd0a64..c7d39b10d1a2 100644 --- a/drivers/media/i2c/alvium-csi2.c +++ b/drivers/media/i2c/alvium-csi2.c @@ -2367,6 +2367,9 @@ static int alvium_get_dt_data(struct alvium_dev *alvium) static int alvium_set_power(struct alvium_dev *alvium, bool on) { int ret; + int alvium_boot_time_timout = 7000; + const int alvium_poll_interval = 500; + u64 val = 0; if (!on) return regulator_disable(alvium->reg_vcc); @@ -2375,8 +2378,22 @@ static int alvium_set_power(struct alvium_dev *alvium, bool on) if (ret) return ret; - /* alvium boot time 7s */ - msleep(7000); + /* alvium boot time is less than 7s, but eventually it's already on */ + do { + alvium_read(alvium, REG_BCRM_HEARTBEAT_RW, &val, &ret); + if (ret >= 0) + break; + + msleep(alvium_poll_interval); + alvium_boot_time_timout -= alvium_poll_interval; + } while (alvium_boot_time_timout > 0); + + if (ret < 0) + return ret; + + if (alvium_boot_time_timout <= 0) + return -ETIMEDOUT; + return 0; }