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[24.22.235.96]) by smtp.gmail.com with ESMTPSA id l44sm534742pje.29.2019.06.18.22.27.40 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 18 Jun 2019 22:27:40 -0700 (PDT) From: Andrey Smirnov To: dri-devel@lists.freedesktop.org Subject: [PATCH v6 06/15] drm/bridge: tc358767: Simplify AUX data read Date: Tue, 18 Jun 2019 22:27:07 -0700 Message-Id: <20190619052716.16831-7-andrew.smirnov@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190619052716.16831-1-andrew.smirnov@gmail.com> References: <20190619052716.16831-1-andrew.smirnov@gmail.com> MIME-Version: 1.0 X-Mailman-Approved-At: Wed, 19 Jun 2019 07:10:14 +0000 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=G/oBLQcGnx/gnzbBsvs2luhfWdsPZ44ykpse07/04ZU=; b=T+85u3eDWlE84s/NikVtVZ07INyUOjHurTvZKCngf8SQNC+k7kSRNe3RMyHuACMyW0 Ye5rm36YZ69RFtdGRolDtGvr85jKQdoFYHw1nKcS2eaPiktqLcr3A0Jw+cj72IU85s8s 43+slUjdX34FMIsgI2zY9EqseYRetvIYz3JV9nIFxLLy59UlfwgvcengPXr6VgN0ZpCu EiYzn4QWWZfmols4NOSEXEmzKuLvMGqx7gUmkuh8QXq2zI6TvJECznG0mURQ37sQfWQ0 lBkPnxzCGM925GxDuiXv/zcTdUuYHIPEEqYK3jYRKD78UJcofNLAeZxAmpJy0U/ma6N4 HBpw== X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Cory Tusar , Andrey Smirnov , Andrey Gusakov , linux-kernel@vger.kernel.org, Tomi Valkeinen , Laurent Pinchart , Chris Healy Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Simplify AUX data read by removing index arithmetic and shifting with a helper function that does two things: 1. Fetch data from up to 4 32-bit registers from the chip 2. Copy read data into user provided array. Signed-off-by: Andrey Smirnov Reviewed-by: Andrzej Hajda Cc: Andrzej Hajda Cc: Laurent Pinchart Cc: Tomi Valkeinen Cc: Andrey Gusakov Cc: Philipp Zabel Cc: Cory Tusar Cc: Chris Healy Cc: Lucas Stach Cc: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org --- drivers/gpu/drm/bridge/tc358767.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 6a3e7c7e1189..02f6d907f5c4 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -321,6 +321,20 @@ static int tc_aux_get_status(struct tc_data *tc, u8 *reply) return 0; } +static int tc_aux_read_data(struct tc_data *tc, void *data, size_t size) +{ + u32 auxrdata[DP_AUX_MAX_PAYLOAD_BYTES / sizeof(u32)]; + int ret, count = ALIGN(size, sizeof(u32)); + + ret = regmap_raw_read(tc->regmap, DP0_AUXRDATA(0), auxrdata, count); + if (ret) + return ret; + + memcpy(data, auxrdata, size); + + return size; +} + static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) { @@ -379,19 +393,10 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, if (ret) return ret; - if (request == DP_AUX_I2C_READ || request == DP_AUX_NATIVE_READ) { - /* Read data */ - while (i < size) { - if ((i % 4) == 0) { - ret = regmap_read(tc->regmap, - DP0_AUXRDATA(i >> 2), &tmp); - if (ret) - return ret; - } - buf[i] = tmp & 0xff; - tmp = tmp >> 8; - i++; - } + switch (request) { + case DP_AUX_NATIVE_READ: + case DP_AUX_I2C_READ: + return tc_aux_read_data(tc, msg->buffer, size); } return size;