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[24.22.235.96]) by smtp.gmail.com with ESMTPSA id o76sm16154476pfa.156.2019.03.21.20.29.25 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 21 Mar 2019 20:29:26 -0700 (PDT) From: Andrey Smirnov To: dri-devel@lists.freedesktop.org Cc: Andrey Smirnov , Archit Taneja , Andrzej Hajda , Laurent Pinchart , Tomi Valkeinen , Andrey Gusakov , Philipp Zabel , Chris Healy , Lucas Stach , linux-kernel@vger.kernel.org Subject: [PATCH v2 09/15] drm/bridge: tc358767: Use reported AUX transfer size Date: Thu, 21 Mar 2019 20:28:55 -0700 Message-Id: <20190322032901.12045-10-andrew.smirnov@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190322032901.12045-1-andrew.smirnov@gmail.com> References: <20190322032901.12045-1-andrew.smirnov@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Don't assume that requested data transfer size is the same as amount of data that was transferred. Change the code to get that information from DP0_AUXSTATUS instead. Since the check for AUX_BUSY in tc_aux_get_status() is pointless (it will always called after tc_aux_wait_busy()) and there's only one user of it, inline its code into tc_aux_transfer() instead of trying to accommodate the change above. Signed-off-by: Andrey Smirnov Cc: Archit Taneja Cc: Andrzej Hajda Cc: Laurent Pinchart Cc: Tomi Valkeinen Cc: Andrey Gusakov Cc: Philipp Zabel Cc: Chris Healy Cc: Lucas Stach Cc: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org --- drivers/gpu/drm/bridge/tc358767.c | 40 ++++++++++--------------------- 1 file changed, 12 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 8adaac5ca271..7e4607c6907f 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -144,10 +144,10 @@ #define DP0_AUXWDATA(i) (0x066c + (i) * 4) #define DP0_AUXRDATA(i) (0x067c + (i) * 4) #define DP0_AUXSTATUS 0x068c -#define AUX_STATUS_MASK 0xf0 -#define AUX_STATUS_SHIFT 4 -#define AUX_TIMEOUT BIT(1) -#define AUX_BUSY BIT(0) +#define AUX_BYTES GENMASK(15, 8) +#define AUX_STATUS GENMASK(7, 4) +#define AUX_TIMEOUT BIT(1) +#define AUX_BUSY BIT(0) #define DP0_AUXI2CADR 0x0698 /* Link Training */ @@ -284,29 +284,6 @@ static int tc_aux_wait_busy(struct tc_data *tc, unsigned int timeout_ms) 1000, 1000 * timeout_ms); } -static int tc_aux_get_status(struct tc_data *tc, u8 *reply) -{ - int ret; - u32 value; - - ret = regmap_read(tc->regmap, DP0_AUXSTATUS, &value); - if (ret < 0) - return ret; - - if (value & AUX_BUSY) { - dev_err(tc->dev, "aux busy!\n"); - return -EBUSY; - } - - if (value & AUX_TIMEOUT) { - dev_err(tc->dev, "aux access timeout!\n"); - return -ETIMEDOUT; - } - - *reply = (value & AUX_STATUS_MASK) >> AUX_STATUS_SHIFT; - return 0; -} - static int tc_aux_write_data(struct tc_data *tc, const void *data, size_t size) { @@ -360,6 +337,7 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, struct tc_data *tc = aux_to_tc(aux); size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size); u8 request = msg->request & ~DP_AUX_I2C_MOT; + u32 auxstatus; int ret; if (size == 0) @@ -397,10 +375,16 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, if (ret) return ret; - ret = tc_aux_get_status(tc, &msg->reply); + ret = regmap_read(tc->regmap, DP0_AUXSTATUS, &auxstatus); if (ret) return ret; + if (auxstatus & AUX_TIMEOUT) + return -ETIMEDOUT; + + size = FIELD_GET(AUX_BYTES, auxstatus); + msg->reply = FIELD_GET(AUX_STATUS, auxstatus); + switch (request) { case DP_AUX_NATIVE_READ: case DP_AUX_I2C_READ: -- 2.20.1