[PATCH v2] ASoC: cros_ec_codec: Reset I2S RX when probing
It is not guaranteed that I2S RX is disabled when the kernel booting. For example, if the kernel crashes while it is enabled, it will keep enabled until the next time EC reboots. Reset I2S RX when probing to fix this issue.
Signed-off-by: Yu-Hsuan Hsu yuhsuan@chromium.org --- drivers/platform/chrome/cros_ec_proto.c | 7 ++++++- include/linux/platform_data/cros_ec_commands.h | 1 + sound/soc/codecs/cros_ec_codec.c | 9 +++++++++ 3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 3e745e0fe092c..2c60690d7147c 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -572,7 +572,12 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, return -ENOTSUPP; } else if (msg->result != EC_RES_SUCCESS) { dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result); - return -EPROTO; + switch (msg->result) { + case EC_RES_INVALID_PARAM: + return -EINVAL; + default: + return -EPROTO; + } }
return ret; diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 69210881ebac8..11ce917ca924c 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -4598,6 +4598,7 @@ enum ec_codec_i2s_rx_subcmd { EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH = 0x2, EC_CODEC_I2S_RX_SET_DAIFMT = 0x3, EC_CODEC_I2S_RX_SET_BCLK = 0x4, + EC_CODEC_I2S_RX_RESET = 0x5, EC_CODEC_I2S_RX_SUBCMD_COUNT, };
diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c index f23956cf4ed84..b5ff30b7f1aa8 100644 --- a/sound/soc/codecs/cros_ec_codec.c +++ b/sound/soc/codecs/cros_ec_codec.c @@ -1034,6 +1034,15 @@ static int cros_ec_codec_platform_probe(struct platform_device *pdev) } priv->ec_capabilities = r.capabilities;
+ /* Reset EC codec I2S RX. */ + p.cmd = EC_CODEC_I2S_RX_RESET; + ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX, + (uint8_t *)&p, sizeof(p), NULL, 0); + if (ret == -EINVAL) + dev_info(dev, "Missing reset command. Please update your EC firmware.\n"); + else if (ret) + dev_err(dev, "failed to EC_CODEC_I2S_RESET: %d\n", ret); + platform_set_drvdata(pdev, priv);
ret = devm_snd_soc_register_component(dev, &i2s_rx_component_driver,
On Thu, Jul 16, 2020 at 10:09 AM Yu-Hsuan Hsu yuhsuan@chromium.org wrote:
It is not guaranteed that I2S RX is disabled when the kernel booting. For example, if the kernel crashes while it is enabled, it will keep enabled until the next time EC reboots. Reset I2S RX when probing to fix this issue.
Signed-off-by: Yu-Hsuan Hsu yuhsuan@chromium.org
drivers/platform/chrome/cros_ec_proto.c | 7 ++++++- include/linux/platform_data/cros_ec_commands.h | 1 + sound/soc/codecs/cros_ec_codec.c | 9 +++++++++ 3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 3e745e0fe092c..2c60690d7147c 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -572,7 +572,12 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, return -ENOTSUPP; } else if (msg->result != EC_RES_SUCCESS) { dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
return -EPROTO;
switch (msg->result) {case EC_RES_INVALID_PARAM:return -EINVAL;
As we have learned, this may impact other callers of cros_ec_cmd_xfer_status() which only accept -EPROTO as error return value. In addition to that, the code is odd:
if (msg->result == EC_RES_INVALID_VERSION) { ... } else if (msg->result != EC_RES_SUCCESS) { switch (msg->result) { .... } }
I really dislike the notion of changing error return values of cros_ec_cmd_xfer_status() one by one. That can only cause ongoing trouble with callers expecting specific error return codes (as we have already seen).
Guenter
default:return -EPROTO;} } return ret;diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 69210881ebac8..11ce917ca924c 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -4598,6 +4598,7 @@ enum ec_codec_i2s_rx_subcmd { EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH = 0x2, EC_CODEC_I2S_RX_SET_DAIFMT = 0x3, EC_CODEC_I2S_RX_SET_BCLK = 0x4,
EC_CODEC_I2S_RX_RESET = 0x5, EC_CODEC_I2S_RX_SUBCMD_COUNT,};
diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c index f23956cf4ed84..b5ff30b7f1aa8 100644 --- a/sound/soc/codecs/cros_ec_codec.c +++ b/sound/soc/codecs/cros_ec_codec.c @@ -1034,6 +1034,15 @@ static int cros_ec_codec_platform_probe(struct platform_device *pdev) } priv->ec_capabilities = r.capabilities;
/* Reset EC codec I2S RX. */p.cmd = EC_CODEC_I2S_RX_RESET;ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,(uint8_t *)&p, sizeof(p), NULL, 0);if (ret == -EINVAL)dev_info(dev, "Missing reset command. Please update your EC firmware.\n");else if (ret)dev_err(dev, "failed to EC_CODEC_I2S_RESET: %d\n", ret);platform_set_drvdata(pdev, priv); ret = devm_snd_soc_register_component(dev, &i2s_rx_component_driver,-- 2.27.0.389.gc38d7665816-goog
Hi,
On 16/7/20 19:23, Guenter Roeck wrote:
On Thu, Jul 16, 2020 at 10:09 AM Yu-Hsuan Hsu yuhsuan@chromium.org wrote:
It is not guaranteed that I2S RX is disabled when the kernel booting. For example, if the kernel crashes while it is enabled, it will keep enabled until the next time EC reboots. Reset I2S RX when probing to fix this issue.
Signed-off-by: Yu-Hsuan Hsu yuhsuan@chromium.org
drivers/platform/chrome/cros_ec_proto.c | 7 ++++++- include/linux/platform_data/cros_ec_commands.h | 1 + sound/soc/codecs/cros_ec_codec.c | 9 +++++++++ 3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 3e745e0fe092c..2c60690d7147c 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -572,7 +572,12 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, return -ENOTSUPP; } else if (msg->result != EC_RES_SUCCESS) { dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
return -EPROTO;
switch (msg->result) {case EC_RES_INVALID_PARAM:return -EINVAL;As we have learned, this may impact other callers of cros_ec_cmd_xfer_status() which only accept -EPROTO as error return value. In addition to that, the code is odd:
if (msg->result == EC_RES_INVALID_VERSION) { ... } else if (msg->result != EC_RES_SUCCESS) { switch (msg->result) { .... } }
Ack, this is odd.
I really dislike the notion of changing error return values of cros_ec_cmd_xfer_status() one by one. That can only cause ongoing trouble with callers expecting specific error return codes (as we have already seen).
Hmm, that's a good point. Ok.
Let's apply the Guenter's patch that maps the errors *and* fix the callers of cros_ec_cmd_xfer_status which only accept -EPROTO (there are few).
Yu-Hsuan, can you take care of this and send a patch series with all the required patches? If not, I can work on this next week.
Thanks, Enric
Guenter
default:return -EPROTO;} } return ret;diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 69210881ebac8..11ce917ca924c 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -4598,6 +4598,7 @@ enum ec_codec_i2s_rx_subcmd { EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH = 0x2, EC_CODEC_I2S_RX_SET_DAIFMT = 0x3, EC_CODEC_I2S_RX_SET_BCLK = 0x4,
EC_CODEC_I2S_RX_RESET = 0x5, EC_CODEC_I2S_RX_SUBCMD_COUNT,};
diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c index f23956cf4ed84..b5ff30b7f1aa8 100644 --- a/sound/soc/codecs/cros_ec_codec.c +++ b/sound/soc/codecs/cros_ec_codec.c @@ -1034,6 +1034,15 @@ static int cros_ec_codec_platform_probe(struct platform_device *pdev) } priv->ec_capabilities = r.capabilities;
/* Reset EC codec I2S RX. */p.cmd = EC_CODEC_I2S_RX_RESET;ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,(uint8_t *)&p, sizeof(p), NULL, 0);if (ret == -EINVAL)dev_info(dev, "Missing reset command. Please update your EC firmware.\n");else if (ret)dev_err(dev, "failed to EC_CODEC_I2S_RESET: %d\n", ret);platform_set_drvdata(pdev, priv); ret = devm_snd_soc_register_component(dev, &i2s_rx_component_driver,-- 2.27.0.389.gc38d7665816-goog
On Thu, Jul 16, 2020 at 10:47 AM Enric Balletbo i Serra enric.balletbo@collabora.com wrote:
Hi,
On 16/7/20 19:23, Guenter Roeck wrote:
On Thu, Jul 16, 2020 at 10:09 AM Yu-Hsuan Hsu yuhsuan@chromium.org wrote:
It is not guaranteed that I2S RX is disabled when the kernel booting. For example, if the kernel crashes while it is enabled, it will keep enabled until the next time EC reboots. Reset I2S RX when probing to fix this issue.
Signed-off-by: Yu-Hsuan Hsu yuhsuan@chromium.org
drivers/platform/chrome/cros_ec_proto.c | 7 ++++++- include/linux/platform_data/cros_ec_commands.h | 1 + sound/soc/codecs/cros_ec_codec.c | 9 +++++++++ 3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 3e745e0fe092c..2c60690d7147c 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -572,7 +572,12 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, return -ENOTSUPP; } else if (msg->result != EC_RES_SUCCESS) { dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
return -EPROTO;
switch (msg->result) {case EC_RES_INVALID_PARAM:return -EINVAL;As we have learned, this may impact other callers of cros_ec_cmd_xfer_status() which only accept -EPROTO as error return value. In addition to that, the code is odd:
if (msg->result == EC_RES_INVALID_VERSION) { ... } else if (msg->result != EC_RES_SUCCESS) { switch (msg->result) { .... } }Ack, this is odd.
I really dislike the notion of changing error return values of cros_ec_cmd_xfer_status() one by one. That can only cause ongoing trouble with callers expecting specific error return codes (as we have already seen).
Hmm, that's a good point. Ok.
Let's apply the Guenter's patch that maps the errors *and* fix the callers of cros_ec_cmd_xfer_status which only accept -EPROTO (there are few).
Yu-Hsuan, can you take care of this and send a patch series with all the required patches? If not, I can work on this next week.
I can look into it as well. Let me know - I don't want to duplicate work.
Guenter
Thanks, Enric
Guenter
default:return -EPROTO;} } return ret;diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 69210881ebac8..11ce917ca924c 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -4598,6 +4598,7 @@ enum ec_codec_i2s_rx_subcmd { EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH = 0x2, EC_CODEC_I2S_RX_SET_DAIFMT = 0x3, EC_CODEC_I2S_RX_SET_BCLK = 0x4,
EC_CODEC_I2S_RX_RESET = 0x5, EC_CODEC_I2S_RX_SUBCMD_COUNT,};
diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c index f23956cf4ed84..b5ff30b7f1aa8 100644 --- a/sound/soc/codecs/cros_ec_codec.c +++ b/sound/soc/codecs/cros_ec_codec.c @@ -1034,6 +1034,15 @@ static int cros_ec_codec_platform_probe(struct platform_device *pdev) } priv->ec_capabilities = r.capabilities;
/* Reset EC codec I2S RX. */p.cmd = EC_CODEC_I2S_RX_RESET;ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,(uint8_t *)&p, sizeof(p), NULL, 0);if (ret == -EINVAL)dev_info(dev, "Missing reset command. Please update your EC firmware.\n");else if (ret)dev_err(dev, "failed to EC_CODEC_I2S_RESET: %d\n", ret);platform_set_drvdata(pdev, priv); ret = devm_snd_soc_register_component(dev, &i2s_rx_component_driver,-- 2.27.0.389.gc38d7665816-goog
Guenter Roeck groeck@google.com 於 2020年7月17日 週五 下午10:32寫道：
On Thu, Jul 16, 2020 at 10:47 AM Enric Balletbo i Serra enric.balletbo@collabora.com wrote:
Hi,
On 16/7/20 19:23, Guenter Roeck wrote:
On Thu, Jul 16, 2020 at 10:09 AM Yu-Hsuan Hsu yuhsuan@chromium.org wrote:
It is not guaranteed that I2S RX is disabled when the kernel booting. For example, if the kernel crashes while it is enabled, it will keep enabled until the next time EC reboots. Reset I2S RX when probing to fix this issue.
Signed-off-by: Yu-Hsuan Hsu yuhsuan@chromium.org
drivers/platform/chrome/cros_ec_proto.c | 7 ++++++- include/linux/platform_data/cros_ec_commands.h | 1 + sound/soc/codecs/cros_ec_codec.c | 9 +++++++++ 3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 3e745e0fe092c..2c60690d7147c 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -572,7 +572,12 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, return -ENOTSUPP; } else if (msg->result != EC_RES_SUCCESS) { dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
return -EPROTO;
switch (msg->result) {case EC_RES_INVALID_PARAM:return -EINVAL;As we have learned, this may impact other callers of cros_ec_cmd_xfer_status() which only accept -EPROTO as error return value. In addition to that, the code is odd:
if (msg->result == EC_RES_INVALID_VERSION) { ... } else if (msg->result != EC_RES_SUCCESS) { switch (msg->result) { .... } }Ack, this is odd.
I really dislike the notion of changing error return values of cros_ec_cmd_xfer_status() one by one. That can only cause ongoing trouble with callers expecting specific error return codes (as we have already seen).
Hmm, that's a good point. Ok.
Let's apply the Guenter's patch that maps the errors *and* fix the callers of cros_ec_cmd_xfer_status which only accept -EPROTO (there are few).
Yu-Hsuan, can you take care of this and send a patch series with all the required patches? If not, I can work on this next week.
I can look into it as well. Let me know - I don't want to duplicate work.
Guenter
Hi Guenter, Really thanks for your assistance! Could you help me on those patches? Since you wrote that patch, I think it should be the most efficient way to make them merged.
Thanks, Yu-Hsuan
Thanks, Enric
Guenter
default:return -EPROTO;} } return ret;diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 69210881ebac8..11ce917ca924c 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -4598,6 +4598,7 @@ enum ec_codec_i2s_rx_subcmd { EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH = 0x2, EC_CODEC_I2S_RX_SET_DAIFMT = 0x3, EC_CODEC_I2S_RX_SET_BCLK = 0x4,
EC_CODEC_I2S_RX_RESET = 0x5, EC_CODEC_I2S_RX_SUBCMD_COUNT,};
diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c index f23956cf4ed84..b5ff30b7f1aa8 100644 --- a/sound/soc/codecs/cros_ec_codec.c +++ b/sound/soc/codecs/cros_ec_codec.c @@ -1034,6 +1034,15 @@ static int cros_ec_codec_platform_probe(struct platform_device *pdev) } priv->ec_capabilities = r.capabilities;
/* Reset EC codec I2S RX. */p.cmd = EC_CODEC_I2S_RX_RESET;ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,(uint8_t *)&p, sizeof(p), NULL, 0);if (ret == -EINVAL)dev_info(dev, "Missing reset command. Please update your EC firmware.\n");else if (ret)dev_err(dev, "failed to EC_CODEC_I2S_RESET: %d\n", ret);platform_set_drvdata(pdev, priv); ret = devm_snd_soc_register_component(dev, &i2s_rx_component_driver,-- 2.27.0.389.gc38d7665816-goog
On Fri, Jul 17, 2020 at 11:51 AM Yu-Hsuan Hsu yuhsuan@chromium.org wrote:
Guenter Roeck groeck@google.com 於 2020年7月17日 週五 下午10:32寫道：
On Thu, Jul 16, 2020 at 10:47 AM Enric Balletbo i Serra enric.balletbo@collabora.com wrote:
Hi,
On 16/7/20 19:23, Guenter Roeck wrote:
On Thu, Jul 16, 2020 at 10:09 AM Yu-Hsuan Hsu yuhsuan@chromium.org wrote:
It is not guaranteed that I2S RX is disabled when the kernel booting. For example, if the kernel crashes while it is enabled, it will keep enabled until the next time EC reboots. Reset I2S RX when probing to fix this issue.
Signed-off-by: Yu-Hsuan Hsu yuhsuan@chromium.org
drivers/platform/chrome/cros_ec_proto.c | 7 ++++++- include/linux/platform_data/cros_ec_commands.h | 1 + sound/soc/codecs/cros_ec_codec.c | 9 +++++++++ 3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 3e745e0fe092c..2c60690d7147c 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -572,7 +572,12 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, return -ENOTSUPP; } else if (msg->result != EC_RES_SUCCESS) { dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
return -EPROTO;
switch (msg->result) {case EC_RES_INVALID_PARAM:return -EINVAL;As we have learned, this may impact other callers of cros_ec_cmd_xfer_status() which only accept -EPROTO as error return value. In addition to that, the code is odd:
if (msg->result == EC_RES_INVALID_VERSION) { ... } else if (msg->result != EC_RES_SUCCESS) { switch (msg->result) { .... } }Ack, this is odd.
I really dislike the notion of changing error return values of cros_ec_cmd_xfer_status() one by one. That can only cause ongoing trouble with callers expecting specific error return codes (as we have already seen).
Hmm, that's a good point. Ok.
Let's apply the Guenter's patch that maps the errors *and* fix the callers of cros_ec_cmd_xfer_status which only accept -EPROTO (there are few).
Yu-Hsuan, can you take care of this and send a patch series with all the required patches? If not, I can work on this next week.
I can look into it as well. Let me know - I don't want to duplicate work.
Guenter
Hi Guenter, Really thanks for your assistance! Could you help me on those patches? Since you wrote that patch, I think it should be the most efficient way to make them merged.
Untested patch series is at crrev.com/c/2306731. I'll try to get a successful CQ pass with both chromeos-5.4 and chromeos-4.19 and submit the relevant patches upstream after it passes.
Guenter
Thanks, Yu-Hsuan
Thanks, Enric
Guenter
default:return -EPROTO;} } return ret;diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 69210881ebac8..11ce917ca924c 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -4598,6 +4598,7 @@ enum ec_codec_i2s_rx_subcmd { EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH = 0x2, EC_CODEC_I2S_RX_SET_DAIFMT = 0x3, EC_CODEC_I2S_RX_SET_BCLK = 0x4,
EC_CODEC_I2S_RX_RESET = 0x5, EC_CODEC_I2S_RX_SUBCMD_COUNT,};
diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c index f23956cf4ed84..b5ff30b7f1aa8 100644 --- a/sound/soc/codecs/cros_ec_codec.c +++ b/sound/soc/codecs/cros_ec_codec.c @@ -1034,6 +1034,15 @@ static int cros_ec_codec_platform_probe(struct platform_device *pdev) } priv->ec_capabilities = r.capabilities;
/* Reset EC codec I2S RX. */p.cmd = EC_CODEC_I2S_RX_RESET;ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,(uint8_t *)&p, sizeof(p), NULL, 0);if (ret == -EINVAL)dev_info(dev, "Missing reset command. Please update your EC firmware.\n");else if (ret)dev_err(dev, "failed to EC_CODEC_I2S_RESET: %d\n", ret);platform_set_drvdata(pdev, priv); ret = devm_snd_soc_register_component(dev, &i2s_rx_component_driver,-- 2.27.0.389.gc38d7665816-goog
participants (3)
-
Enric Balletbo i Serra -
Guenter Roeck -
Yu-Hsuan Hsu