From nobody Tue Mar 11 19:31:16 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AC5211D0F6B for ; Wed, 16 Oct 2024 07:54:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729065252; cv=none; b=GPc1ceB7q1TRnXZzNTYumvIYhjB44Pdg2UuXjRDiPJTY+tkvmrJ+3vT3nwBioJgfi9a0mqKOKOufwMRHwgzRePUsdZRAFlXut4c46eo1guU/kRDtMajP71m84Fk+GQkTfvssTyaK+3ca5A+cXE00lGIStwmR8ttmMuzs9Q36onk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729065252; c=relaxed/simple; bh=byUvTUmBe3ucrhmaZKyE7qNvMWkXkPLvh0ygtdtnhrY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=RJn6unRLXn4JmaIOR00UGAKL5zO+aYe14gBHOs7yUS+7RKkwDm/0qSKExdI8btEpmjf+3eqMVbc2WLoEkae/ys3quFFzc9enWlfg724zhuzbpc3R2heAEhYG5jKiEqPlREqy0gHPwQxA+gcRqn40IhExx72o36aQsRy3KW4yMaI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I9t2ekzg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="I9t2ekzg" Received: by smtp.kernel.org (Postfix) with ESMTPS id 81E87C4CED0; Wed, 16 Oct 2024 07:54:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729065252; bh=byUvTUmBe3ucrhmaZKyE7qNvMWkXkPLvh0ygtdtnhrY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=I9t2ekzgFTdNaqnvl6XkfL1A9w82D6mPPCMsEhDaxJ6S3PuysprdfCfSzbdQIWD1c CsIe/SxM2arR2ftULtzWW0XT5JZAnXrmuq3u+UGzTjaqyKGYNjFBBaaoGCyTOqaW58 +67ohwYq56c2qgxhZf1Dpg9WZc7vAWvxrCOacyVfscUoDXPOrAJ5Qf6JA0E1eVD705 Ti8qCKC70xxxZKhlLW0qf4JZnHssYT89xxCPUUkIJp+jYyaDz4G0d2LrbHy5tu1HKj oD7madnZbf4Qd3cx90Kg9I12r1fqRQiQZH5HgIVwQni2sdQwWiDYQr0mnzLuRbWRU8 jf7ODSQZyKdDw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 784ADD20684; Wed, 16 Oct 2024 07:54:12 +0000 (UTC) From: Hermes Wu via B4 Relay Date: Wed, 16 Oct 2024 15:54:14 +0800 Subject: [PATCH v6 02/10] drm/bridge: it6505: improve AUX operation for edid read 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: <20241016-upstream-v6-v6-2-4d93a0c46de1@ite.com.tw> References: <20241016-upstream-v6-v6-0-4d93a0c46de1@ite.com.tw> In-Reply-To: <20241016-upstream-v6-v6-0-4d93a0c46de1@ite.com.tw> To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , AngeloGioacchino Del Regno , Pin-yen Lin Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Kenneth Hung , Pet Weng , Hermes Wu X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1729065263; l=1471; i=Hermes.wu@ite.com.tw; s=20241016; h=from:subject:message-id; bh=DsF7JOpVrJV3KlaD250GuWi9WoMmd/kBUwDp0jcn0es=; b=QsZmTaceZO+ah8EObq3Tqo04UxLpfWswspNydQZGRfnY4isMz45zI9fWxFm0UrWAqfCsk83y6 7ePoxjJKBGqB8mf0ruv1m0C+TpLatDwpk3XrGL1xCItHSSnQRmhcd0p X-Developer-Key: i=Hermes.wu@ite.com.tw; a=ed25519; pk=kV18uQEXox+1WccdQceCbMlJKN+BBNUk3N8VsoULcQ0= X-Endpoint-Received: by B4 Relay for Hermes.wu@ite.com.tw/20241016 with auth_id=250 X-Original-From: Hermes Wu Reply-To: Hermes.wu@ite.com.tw From: Hermes Wu The original AUX operation using data registers is limited to 4 bytes. The AUX operation command CMD_AUX_I2C_EDID_READ uses AUX FIFO and is capable of reading 16 bytes. This improves the speed of EDID read. Signed-off-by: Hermes Wu Reviewed-by: Dmitry Baryshkov --- drivers/gpu/drm/bridge/ite-it6505.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/i= te-it6505.c index 3272ca6951f2585f9592834869de23ac50ce41a4..9747d7ccf435d536da55c6a3ff7= 9e504b7c724f0 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -1076,10 +1076,13 @@ static ssize_t it6505_aux_do_transfer(struct it6505= *it6505, size_t size, enum aux_cmd_reply *reply) { int i, ret_size, ret =3D 0, request_size; + int fifo_max_size =3D (cmd =3D=3D CMD_AUX_I2C_EDID_READ) ? AUX_FIFO_MAX_S= IZE : 4; =20 mutex_lock(&it6505->aux_lock); - for (i =3D 0; i < size; i +=3D 4) { - request_size =3D min((int)size - i, 4); + i =3D 0; + do { + request_size =3D min_t(int, (int)size - i, fifo_max_size); + ret_size =3D it6505_aux_operation(it6505, cmd, address + i, buffer + i, request_size, reply); @@ -1088,8 +1091,9 @@ static ssize_t it6505_aux_do_transfer(struct it6505 *= it6505, goto aux_op_err; } =20 + i +=3D request_size; ret +=3D ret_size; - } + } while (i < size); =20 aux_op_err: mutex_unlock(&it6505->aux_lock); --=20 2.34.1