drm/dp: Adjust i2c-over-aux retry count based on message size and i2c bus speed

Calculate the number of retries we should do for each i2c-over-aux
message based on the time it takes to perform the i2c transfer vs. the
aux transfer. We assume the shortest possible length for the aux
transfer, and the longest possible (exluding clock stretching) for the
i2c transfer.

The DP spec has some examples on how to calculate this, but we don't
calculate things quite the same way. The spec doesn't account for the
retry interval (assumes immediate retry on defer), and doesn't assume
the best/worst case behaviour as we do.

Note that currently we assume 10 kHz speed for the i2c bus. Some real
world devices (eg. some Apple DP->VGA dongle) fails with less than 16
retries. and that would correspond to something close to 15 kHz (with
our method of calculating things) But let's just go for 10 kHz to be
on the safe side. Ideally we should query/set the i2c bus speed via
DPCD but for now this should at leaast remove the regression from the
1->16 byte trasnfer size change. And of course if the sink completes
the transfer quicker this shouldn't slow things down since we don't
change the interval between retries.

I did a few experiments with a DP->DVI dongle I have that allows you
to change the i2c bus speed. Here are the results of me changing the
actual bus speed and the assumed bus speed and seeing when we start
to fail the operation:

actual i2c khz          assumed i2c khz         max retries
1                       1 ok -> 2 fail          211 ok -> 106 fail
5                       8 ok -> 9 fail          27 ok -> 24 fail
10                      17 ok -> 18 fail        13 ok -> 12 fail
100                     210 ok -> 211 fail      2 ok -> 1 fail

So based on that we have a fairly decent safety margin baked into
the formula to calculate the max number of retries.

Fixes a regression with some DP dongles from:
commit 1d002fa720738bcd0bddb9178e9ea0773288e1dd
Author: Simon Farnsworth <simon.farnsworth@onelan.co.uk>
Date:   Tue Feb 10 18:38:08 2015 +0000

    drm/dp: Use large transactions for I2C over AUX

v2: Use best case for AUX and worst case for i2c (Simon Farnsworth)
    Add a define our AUX retry interval and account for it
v3: Make everything usecs to avoid confusion about units (Daniel)
    Add a comment reminding people about the AUX bitrate (Daniel)
    Use DIV_ROUND_UP() since we're after the "worst" case for i2c

Cc: Simon Farnsworth <simon.farnsworth@onelan.com>
Cc: moosotc@gmail.com
Tested-by: moosotc@gmail.com
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91451
Reviewed-by: Simon Farnsworth <simon.farnsworth@onelan.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/drm_dp_helper.c

@@ -424,6 +424,81 @@ static u32 drm_dp_i2c_functionality(struct i2c_adapter *adapter)
 	       I2C_FUNC_10BIT_ADDR;
 }
 
+#define AUX_PRECHARGE_LEN 10 /* 10 to 16 */
+#define AUX_SYNC_LEN (16 + 4) /* preamble + AUX_SYNC_END */
+#define AUX_STOP_LEN 4
+#define AUX_CMD_LEN 4
+#define AUX_ADDRESS_LEN 20
+#define AUX_REPLY_PAD_LEN 4
+#define AUX_LENGTH_LEN 8
+
+/*
+ * Calculate the duration of the AUX request/reply in usec. Gives the
+ * "best" case estimate, ie. successful while as short as possible.
+ */
+static int drm_dp_aux_req_duration(const struct drm_dp_aux_msg *msg)
+{
+	int len = AUX_PRECHARGE_LEN + AUX_SYNC_LEN + AUX_STOP_LEN +
+		AUX_CMD_LEN + AUX_ADDRESS_LEN + AUX_LENGTH_LEN;
+
+	if ((msg->request & DP_AUX_I2C_READ) == 0)
+		len += msg->size * 8;
+
+	return len;
+}
+
+static int drm_dp_aux_reply_duration(const struct drm_dp_aux_msg *msg)
+{
+	int len = AUX_PRECHARGE_LEN + AUX_SYNC_LEN + AUX_STOP_LEN +
+		AUX_CMD_LEN + AUX_REPLY_PAD_LEN;
+
+	/*
+	 * For read we expect what was asked. For writes there will
+	 * be 0 or 1 data bytes. Assume 0 for the "best" case.
+	 */
+	if (msg->request & DP_AUX_I2C_READ)
+		len += msg->size * 8;
+
+	return len;
+}
+
+#define I2C_START_LEN 1
+#define I2C_STOP_LEN 1
+#define I2C_ADDR_LEN 9 /* ADDRESS + R/W + ACK/NACK */
+#define I2C_DATA_LEN 9 /* DATA + ACK/NACK */
+
+/*
+ * Calculate the length of the i2c transfer in usec, assuming
+ * the i2c bus speed is as specified. Gives the the "worst"
+ * case estimate, ie. successful while as long as possible.
+ * Doesn't account the the "MOT" bit, and instead assumes each
+ * message includes a START, ADDRESS and STOP. Neither does it
+ * account for additional random variables such as clock stretching.
+ */
+static int drm_dp_i2c_msg_duration(const struct drm_dp_aux_msg *msg,
+				   int i2c_speed_khz)
+{
+	/* AUX bitrate is 1MHz, i2c bitrate as specified */
+	return DIV_ROUND_UP((I2C_START_LEN + I2C_ADDR_LEN +
+			     msg->size * I2C_DATA_LEN +
+			     I2C_STOP_LEN) * 1000, i2c_speed_khz);
+}
+
+/*
+ * Deterine how many retries should be attempted to successfully transfer
+ * the specified message, based on the estimated durations of the
+ * i2c and AUX transfers.
+ */
+static int drm_dp_i2c_retry_count(const struct drm_dp_aux_msg *msg,
+			      int i2c_speed_khz)
+{
+	int aux_time_us = drm_dp_aux_req_duration(msg) +
+		drm_dp_aux_reply_duration(msg);
+	int i2c_time_us = drm_dp_i2c_msg_duration(msg, i2c_speed_khz);
+
+	return DIV_ROUND_UP(i2c_time_us, aux_time_us + AUX_RETRY_INTERVAL);
+}
+
 /*
  * Transfer a single I2C-over-AUX message and handle various error conditions,
  * retrying the transaction as appropriate.  It is assumed that the
@@ -436,13 +511,18 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 {
 	unsigned int retry, defer_i2c;
 	int ret;
-
 	/*
 	 * DP1.2 sections 2.7.7.1.5.6.1 and 2.7.7.1.6.6.1: A DP Source device
 	 * is required to retry at least seven times upon receiving AUX_DEFER
 	 * before giving up the AUX transaction.
+	 *
+	 * We also try to account for the i2c bus speed.
+	 * FIXME currently assumes 10 kHz as some real world devices seem
+	 * to require it. We should query/set the speed via DPCD if supported.
 	 */
-	for (retry = 0, defer_i2c = 0; retry < (7 + defer_i2c); retry++) {
+	int max_retries = max(7, drm_dp_i2c_retry_count(msg, 10));
+
+	for (retry = 0, defer_i2c = 0; retry < (max_retries + defer_i2c); retry++) {
 		mutex_lock(&aux->hw_mutex);
 		ret = aux->transfer(aux, msg);
 		mutex_unlock(&aux->hw_mutex);