From patchwork Thu Oct 3 15:41:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bryan O'Donoghue X-Patchwork-Id: 832620 Received: from mail-ej1-f44.google.com (mail-ej1-f44.google.com [209.85.218.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 45BA41A08AD for ; Thu, 3 Oct 2024 15:41:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.44 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727970092; cv=none; b=OlpuAJ6zyBCzoRhxvULajEH4zdbCFH9dEPmjdkwJ+eZzO0PWLP/ayxr4ywOelYcgno1h8DmhAWws+2O0X8DP+L5hGlBKSSpKosr6s04x6bRJ/uYp4xyhzfqNpsmmLgaDPDm30VYrsWyUysKcZaXjv4rA2sFW6LxNF7KEgs7bKdg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727970092; c=relaxed/simple; bh=vTwVvG8iZlHzHza+YS67mEwp2zyunt+kNzBDYWtFYWc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ePJ1tYBRxQXr6/g9Io7f6sMKQF8dABBIH594/xNCvAVFD1D7h7FLGtKKQEbO1BwLQ9+8Bntn5n85PGCsi2gJcrXtDtPT+3xSFODECM+Lo0CxPF9J85SaS+eaqGzq1+FwuCWRkSACo5bbQSd5NOM5jcdUZCd0/KgOmmrMIbNTyM8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=TL4Q4bWR; arc=none smtp.client-ip=209.85.218.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="TL4Q4bWR" Received: by mail-ej1-f44.google.com with SMTP id a640c23a62f3a-a93b2070e0cso127108166b.3 for ; Thu, 03 Oct 2024 08:41:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1727970089; x=1728574889; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=E7nKjwcfTxwC0PwN6GrPgJAgBaaTNk6QSx4URpDS/gc=; b=TL4Q4bWRRiP1qoLuPCXD3dOh8f7piOzc3j/QC/fg7+dMJurG4zzZpFMQuc5LodDfGI Y48u/kKB853zeg9aWe9EekI53lFE89U1xDldaOiIwykkwjyL6SFe4vvdatrFo3C1FEeS /nqgw5MhdUpDHBiH/PBn4Aim3tfOQ+1xD1uoeWUJJZPv40wH9surip0dhbNhD08SZ5VW t3zKtyaEJw4aKW69l1Z75fRYa1euthTu+2d1gmPSjAvEfV8ZcXlyKApTK/VNfJ7iHcCv 4YY+Qun7qvdqzavRsnIWcYdJkO12B7CP9wFQWCMP6kTnSuvuM+9YsPwEghcgXisP7EVI 46cw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727970089; x=1728574889; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=E7nKjwcfTxwC0PwN6GrPgJAgBaaTNk6QSx4URpDS/gc=; b=eUtuJIbIcCLj2zGnQk6bS2MuMMtfriJgAMTJTXiCh9pqNa9ABL7vI8SihwkvoVo7b2 0GewRVDUVddgNW4YZp5TQmHESth24nnFu6mVbIksvE0H8dlvuGqAowGa+4SuG8dzyp11 3UrremEprhh6kWLD710+1Hqh2tR5vbgNgWdtQvaRArKL+g2cskAG9UZFdaflXkOZgirS Krojv1pn/Un3Y+JhjAFqqXe9BiWRA6R2N8EKT9VpHdNwkeO3/IDe3gafaxpMXpEFdSSj T2BSuy8ed/w4g8CjWLr6UulG1iREE0bfz1fgfjehzWBJsoA9xhdNU1crbghkNVl8vJSg WoIg== X-Gm-Message-State: AOJu0YwmNAfTvDOh0/UNw3AKIZPqMmSnM1F5yij4djTeHRGnL6FeQHyn k4hdbAzdg77M3SNzrxRjKLcmtGsY16eFNOJxopem/7JlLfva2jkHsmPcraLwenk= X-Google-Smtp-Source: AGHT+IG7VzE6KIRS5Oggy5S2KMymWBvAJcUH8H6bPiRroXsOEd0yFu8CHZMFl+zLCXUZVh4IIyvvxg== X-Received: by 2002:a17:907:6093:b0:a8a:58c5:78f1 with SMTP id a640c23a62f3a-a98f8201512mr692467466b.11.1727970088513; Thu, 03 Oct 2024 08:41:28 -0700 (PDT) Received: from [127.0.0.1] ([176.61.106.227]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a99104c4f3fsm98492866b.200.2024.10.03.08.41.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Oct 2024 08:41:28 -0700 (PDT) From: Bryan O'Donoghue Date: Thu, 03 Oct 2024 16:41:25 +0100 Subject: [PATCH v4 1/4] media: ov08x40: Fix burst write sequence Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241003-b4-master-24-11-25-ov08x40-v4-1-7ee2c45fdc8c@linaro.org> References: <20241003-b4-master-24-11-25-ov08x40-v4-0-7ee2c45fdc8c@linaro.org> In-Reply-To: <20241003-b4-master-24-11-25-ov08x40-v4-0-7ee2c45fdc8c@linaro.org> To: Sakari Ailus , Jason Chen , Mauro Carvalho Chehab , Sergey Senozhatsky , Hans Verkuil , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Bryan O'Donoghue , stable@vger.kernel.org X-Mailer: b4 0.15-dev-dedf8 It is necessary to account for I2C quirks in the burst mode path of this driver. Not all I2C controllers can accept arbitrarily long writes and this is represented in the quirks field of the adapter structure. Prior to this patch the following error message is seen on a Qualcomm X1E80100 CRD. [ 38.773524] i2c i2c-2: adapter quirk: msg too long (addr 0x0036, size 290, write) [ 38.781454] ov08x40 2-0036: Failed regs transferred: -95 [ 38.787076] ov08x40 2-0036: ov08x40_start_streaming failed to set regs Fix the error by breaking up the write sequence into the advertised maximum write size of the quirks field if the quirks field is populated. Fixes: 8f667d202384 ("media: ov08x40: Reduce start streaming time") Cc: stable@vger.kernel.org # v6.9+ Tested-by: Bryan O'Donoghue # x1e80100-crd Signed-off-by: Bryan O'Donoghue --- drivers/media/i2c/ov08x40.c | 33 ++++++++++++++++++++++++++++----- 1 file changed, 28 insertions(+), 5 deletions(-) diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c index 48df077522ad0bb2b5f64a6def8844c02af6a193..be25e45175b1322145dca428e845242d8fea2698 100644 --- a/drivers/media/i2c/ov08x40.c +++ b/drivers/media/i2c/ov08x40.c @@ -1339,15 +1339,13 @@ static int ov08x40_read_reg(struct ov08x40 *ov08x, return 0; } -static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg, - u16 last_reg, u8 val) +static int __ov08x40_burst_fill_regs(struct i2c_client *client, u16 first_reg, + u16 last_reg, size_t num_regs, u8 val) { - struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd); struct i2c_msg msgs; - size_t i, num_regs; + size_t i; int ret; - num_regs = last_reg - first_reg + 1; msgs.addr = client->addr; msgs.flags = 0; msgs.len = 2 + num_regs; @@ -1373,6 +1371,31 @@ static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg, return 0; } +static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg, + u16 last_reg, u8 val) +{ + struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd); + size_t num_regs, num_write_regs; + int ret; + + num_regs = last_reg - first_reg + 1; + num_write_regs = num_regs; + + if (client->adapter->quirks && client->adapter->quirks->max_write_len) + num_write_regs = client->adapter->quirks->max_write_len - 2; + + while (first_reg < last_reg) { + ret = __ov08x40_burst_fill_regs(client, first_reg, last_reg, + num_write_regs, val); + if (ret) + return ret; + + first_reg += num_write_regs; + } + + return 0; +} + /* Write registers up to 4 at a time */ static int ov08x40_write_reg(struct ov08x40 *ov08x, u16 reg, u32 len, u32 __val)