[PATCH v5 00/10]drm/bridge: it6505: fix HDCP CTS fail items and add MCCS support

[PATCH v5 00/10]drm/bridge: it6505: fix HDCP CTS fail items and add MCCS support

[Hermes Wu]

From: Hermes Wu <Hermes.wu@ite.com.tw>

This is a v5 patch-set.

There are lots of failure items while running HDCP CTS using UNIGRAF DPR-100.
In Order to fix those failures, HDCP flow needs to be changed.

The DisplayPort AUX protocol supports I2C transport.
In Order to support MCCS via the aux channel, the aux-i2c operation is added.

v4 ->v5:
	-add more messages for changes.
	-[2/10] modified AUX transfer data size judgment.
		change for-loop to do-while.
	-[7/10] change for-loop to do-while.
	-[9/10] change wait timer with timer_after()

	links:
	https://lore.kernel.org/all/20240926074755.22176-4-Hermes.Wu@ite.com.tw/
	https://lore.kernel.org/all/20240926075134.22394-1-Hermes.Wu@ite.com.tw/

v3 ->v4:
	-split changes  into patches.

v2- > v3:
	-split aux read  KSV function to a patch.
	-[1/3] new in v3
	-[2/3] add description of patch

v1 -> v2 :
	- ignored.



Hermes Wu (10):
  drm/bridge: it6505: Change definition of AUX_FIFO_MAX_SIZE
  drm/bridge: it6505: improve AUX operation for edid read
  drm/bridge: it6505: add AUX operation for HDCP KSV list read
  drm/bridge: it6505: Change definition MAX_HDCP_DOWN_STREAM_COUNT
  drm/bridge: it6505: fix HDCP Bstatus check
  drm/bridge: it6505: fix HDCP encryption when R0 ready
  drm/bridge: it6505: fix HDCP CTS KSV list read with UNIGRAF DPR-100.
  drm/bridge: it6505: fix HDCP CTS compare V matching
  drm/bridge: it6505: fix HDCP CTS KSV list wait timer
  drm/bridge: it6505: add I2C functionality on AUX

 drivers/gpu/drm/bridge/ite-it6505.c | 334 +++++++++++++++++++++++-----
 1 file changed, 277 insertions(+), 57 deletions(-)

-- 
2.34.1

[PATCH v5 01/10] drm/bridge: it6505: Change definition of AUX_FIFO_MAX_SIZE

[Hermes Wu]

From: Hermes Wu <Hermes.wu@ite.com.tw>

The hardware AUX FIFO is 16 bytes
Change definition of AUX_FIFO_MAX_SIZE to 16

Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index f372c05360f2..28a8043229d3 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -300,7 +300,7 @@
 #define MAX_CR_LEVEL 0x03
 #define MAX_EQ_LEVEL 0x03
 #define AUX_WAIT_TIMEOUT_MS 15
-#define AUX_FIFO_MAX_SIZE 32
+#define AUX_FIFO_MAX_SIZE 16
 #define PIXEL_CLK_DELAY 1
 #define PIXEL_CLK_INVERSE 0
 #define ADJUST_PHASE_THRESHOLD 80000
-- 
2.34.1

Re: [PATCH v5 01/10] drm/bridge: it6505: Change definition of AUX_FIFO_MAX_SIZE

[Dmitry Baryshkov]

On Tue, Oct 01, 2024 at 02:43:00PM +0800, Hermes Wu wrote:
> From: Hermes Wu <Hermes.wu@ite.com.tw>
> 
> The hardware AUX FIFO is 16 bytes
> Change definition of AUX_FIFO_MAX_SIZE to 16
> 
> Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
> Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

[PATCH v5 02/10] drm/bridge: it6505: improve AUX operation for edid read

[Hermes Wu]

From: Hermes Wu <Hermes.wu@ite.com.tw>

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 <Hermes.wu@ite.com.tw>
---
 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/ite-it6505.c
index 28a8043229d3..864fab7e388f 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 = 0, request_size;
+	int fifo_max_size = (cmd == CMD_AUX_I2C_EDID_READ) ? AUX_FIFO_MAX_SIZE : 4;
 
 	mutex_lock(&it6505->aux_lock);
-	for (i = 0; i < size; i += 4) {
-		request_size = min((int)size - i, 4);
+	i = 0;
+	do {
+		request_size = min_t(int, (int)size - i, fifo_max_size);
+
 		ret_size = 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;
 		}
 
+		i += request_size;
 		ret += ret_size;
-	}
+	} while (i < size);
 
 aux_op_err:
 	mutex_unlock(&it6505->aux_lock);
-- 
2.34.1

Re: [PATCH v5 02/10] drm/bridge: it6505: improve AUX operation for edid read

[Dmitry Baryshkov]

On Tue, Oct 01, 2024 at 02:43:01PM +0800, Hermes Wu wrote:
> From: Hermes Wu <Hermes.wu@ite.com.tw>
> 
> 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.

Nit: Improve the speed of EDID reads by using CMD_AUX_I2C_EDID_READ.

> 
> Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

[PATCH v5 03/10] drm/bridge: it6505: add AUX operation for HDCP KSV list read

[Hermes Wu]

From: Hermes Wu <Hermes.wu@ite.com.tw>

HDCP KSV list readback can choose to use AUX FIFO or general data register.
For some DisplayPort devices, the KSV list must be read in 5 byte boundaries.
The original AUX read command does not support these devices.

The AUX command operation control register "REG_AUX_CMD_REQ" uses b[3:0] as AUX operacion control, and b[7:4] are status bits and read only.
To change KSV read operation uses "CMD_AUX_NATIVE_READ" from using the data registers to using AUX FIFO.
The extended command "CMD_AUX_GET_KSV_LIST" is added as "CMD_AUX_NATIVE_READ" with the 0x10 flag which selects AUX FIFO mode.

Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 864fab7e388f..9a022c095af4 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -126,6 +126,7 @@
 #define REG_AUX_OUT_DATA0 0x27
 
 #define REG_AUX_CMD_REQ 0x2B
+#define M_AUX_REQ_CMD 0x0F
 #define AUX_BUSY BIT(5)
 
 #define REG_AUX_DATA_0_7 0x2C
@@ -324,6 +325,9 @@ enum aux_cmd_type {
 	CMD_AUX_NATIVE_READ = 0x0,
 	CMD_AUX_NATIVE_WRITE = 0x5,
 	CMD_AUX_I2C_EDID_READ = 0xB,
+
+	/* KSV read with AUX FIFO extend from CMD_AUX_NATIVE_READ*/
+	CMD_AUX_GET_KSV_LIST = 0x10,
 };
 
 enum aux_cmd_reply {
@@ -965,7 +969,8 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
 	it6505_set_bits(it6505, REG_AUX_CTRL, AUX_USER_MODE, AUX_USER_MODE);
 
 aux_op_start:
-	if (cmd == CMD_AUX_I2C_EDID_READ) {
+	/* HW AUX FIFO supports only EDID and DCPD KSV FIFO area */
+	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
 		/* AUX EDID FIFO has max length of AUX_FIFO_MAX_SIZE bytes. */
 		size = min_t(size_t, size, AUX_FIFO_MAX_SIZE);
 		/* Enable AUX FIFO read back and clear FIFO */
@@ -996,7 +1001,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
 				  size);
 
 	/* Aux Fire */
-	it6505_write(it6505, REG_AUX_CMD_REQ, cmd);
+	it6505_write(it6505, REG_AUX_CMD_REQ, FIELD_GET(M_AUX_REQ_CMD, cmd));
 
 	ret = it6505_aux_wait(it6505);
 	if (ret < 0)
@@ -1030,7 +1035,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
 		goto aux_op_start;
 	}
 
-	if (cmd == CMD_AUX_I2C_EDID_READ) {
+	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
 		for (i = 0; i < size; i++) {
 			ret = it6505_read(it6505, REG_AUX_DATA_FIFO);
 			if (ret < 0)
@@ -1055,7 +1060,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
 	ret = i;
 
 aux_op_err:
-	if (cmd == CMD_AUX_I2C_EDID_READ) {
+	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
 		/* clear AUX FIFO */
 		it6505_set_bits(it6505, REG_AUX_CTRL,
 				AUX_EN_FIFO_READ | CLR_EDID_FIFO,
@@ -1076,7 +1081,8 @@ static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
 				      size_t size, enum aux_cmd_reply *reply)
 {
 	int i, ret_size, ret = 0, request_size;
-	int fifo_max_size = (cmd == CMD_AUX_I2C_EDID_READ) ? AUX_FIFO_MAX_SIZE : 4;
+	int fifo_max_size = (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) ?
+						 AUX_FIFO_MAX_SIZE : 4;
 
 	mutex_lock(&it6505->aux_lock);
 	i = 0;
-- 
2.34.1

Re: [PATCH v5 03/10] drm/bridge: it6505: add AUX operation for HDCP KSV list read

[Dmitry Baryshkov]

On Tue, Oct 01, 2024 at 02:43:02PM +0800, Hermes Wu wrote:
> From: Hermes Wu <Hermes.wu@ite.com.tw>
> 
> HDCP KSV list readback can choose to use AUX FIFO or general data register.
> For some DisplayPort devices, the KSV list must be read in 5 byte boundaries.
> The original AUX read command does not support these devices.
> 
> The AUX command operation control register "REG_AUX_CMD_REQ" uses b[3:0] as AUX operacion control, and b[7:4] are status bits and read only.
> To change KSV read operation uses "CMD_AUX_NATIVE_READ" from using the data registers to using AUX FIFO.
> The extended command "CMD_AUX_GET_KSV_LIST" is added as "CMD_AUX_NATIVE_READ" with the 0x10 flag which selects AUX FIFO mode.

Please keep the commit message wrapped at 72-75 chars.

Other than that:


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>


> 
> Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 16 +++++++++++-----
>  1 file changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> index 864fab7e388f..9a022c095af4 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -126,6 +126,7 @@
>  #define REG_AUX_OUT_DATA0 0x27
>  
>  #define REG_AUX_CMD_REQ 0x2B
> +#define M_AUX_REQ_CMD 0x0F
>  #define AUX_BUSY BIT(5)
>  
>  #define REG_AUX_DATA_0_7 0x2C
> @@ -324,6 +325,9 @@ enum aux_cmd_type {
>  	CMD_AUX_NATIVE_READ = 0x0,
>  	CMD_AUX_NATIVE_WRITE = 0x5,
>  	CMD_AUX_I2C_EDID_READ = 0xB,
> +
> +	/* KSV read with AUX FIFO extend from CMD_AUX_NATIVE_READ*/
> +	CMD_AUX_GET_KSV_LIST = 0x10,
>  };
>  
>  enum aux_cmd_reply {
> @@ -965,7 +969,8 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
>  	it6505_set_bits(it6505, REG_AUX_CTRL, AUX_USER_MODE, AUX_USER_MODE);
>  
>  aux_op_start:
> -	if (cmd == CMD_AUX_I2C_EDID_READ) {
> +	/* HW AUX FIFO supports only EDID and DCPD KSV FIFO area */
> +	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
>  		/* AUX EDID FIFO has max length of AUX_FIFO_MAX_SIZE bytes. */
>  		size = min_t(size_t, size, AUX_FIFO_MAX_SIZE);
>  		/* Enable AUX FIFO read back and clear FIFO */
> @@ -996,7 +1001,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
>  				  size);
>  
>  	/* Aux Fire */
> -	it6505_write(it6505, REG_AUX_CMD_REQ, cmd);
> +	it6505_write(it6505, REG_AUX_CMD_REQ, FIELD_GET(M_AUX_REQ_CMD, cmd));
>  
>  	ret = it6505_aux_wait(it6505);
>  	if (ret < 0)
> @@ -1030,7 +1035,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
>  		goto aux_op_start;
>  	}
>  
> -	if (cmd == CMD_AUX_I2C_EDID_READ) {
> +	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
>  		for (i = 0; i < size; i++) {
>  			ret = it6505_read(it6505, REG_AUX_DATA_FIFO);
>  			if (ret < 0)
> @@ -1055,7 +1060,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
>  	ret = i;
>  
>  aux_op_err:
> -	if (cmd == CMD_AUX_I2C_EDID_READ) {
> +	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
>  		/* clear AUX FIFO */
>  		it6505_set_bits(it6505, REG_AUX_CTRL,
>  				AUX_EN_FIFO_READ | CLR_EDID_FIFO,
> @@ -1076,7 +1081,8 @@ static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
>  				      size_t size, enum aux_cmd_reply *reply)
>  {
>  	int i, ret_size, ret = 0, request_size;
> -	int fifo_max_size = (cmd == CMD_AUX_I2C_EDID_READ) ? AUX_FIFO_MAX_SIZE : 4;
> +	int fifo_max_size = (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) ?
> +						 AUX_FIFO_MAX_SIZE : 4;
>  
>  	mutex_lock(&it6505->aux_lock);
>  	i = 0;
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry

RE: [PATCH v5 03/10] drm/bridge: it6505: add AUX operation for HDCP KSV list read

[Hermes.Wu]

>-----Original Message-----
>From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> 
>Sent: Monday, October 14, 2024 7:53 PM
>To: Hermes Wu (吳佳宏) <Hermes.Wu@ite.com.tw>
>Cc: Pin-yen Lin <treapking@chromium.org>; Kenneth Hung (洪家倫) <Kenneth.Hung@ite.com.tw>; Pet Weng (翁玉芬) <Pet.Weng@ite.com.tw>; Andrzej Hajda <andrzej.hajda@intel.com>; Neil Armstrong <neil.armstrong@linaro.org>; Robert Foss <rfoss@kernel.org>; Laurent Pinchart <Laurent.pinchart@ideasonboard.com>; Jonas Karlman <jonas@kwiboo.se>; Jernej Skrabec <jernej.skrabec@gmail.com>; Maarten Lankhorst <maarten.lankhorst@linux.intel.com>; Maxime Ripard <mripard@kernel.org>; Thomas Zimmermann <tzimmermann@suse.de>; David Airlie <airlied@gmail.com>; Simona Vetter <simona@ffwll.ch>; open list:DRM DRIVERS <dri-devel@lists.freedesktop.org>; open list <linux-kernel@vger.kernel.org>
>Subject: Re: [PATCH v5 03/10] drm/bridge: it6505: add AUX operation for HDCP KSV list read
>
>On Tue, Oct 01, 2024 at 02:43:02PM +0800, Hermes Wu wrote:
>> From: Hermes Wu <Hermes.wu@ite.com.tw>
>> 
>> HDCP KSV list readback can choose to use AUX FIFO or general data register.
>> For some DisplayPort devices, the KSV list must be read in 5 byte boundaries.
>> The original AUX read command does not support these devices.
>> 
>> The AUX command operation control register "REG_AUX_CMD_REQ" uses b[3:0] as AUX operacion control, and b[7:4] are status bits and read only.
>> To change KSV read operation uses "CMD_AUX_NATIVE_READ" from using the data registers to using AUX FIFO.
>> The extended command "CMD_AUX_GET_KSV_LIST" is added as "CMD_AUX_NATIVE_READ" with the 0x10 flag which selects AUX FIFO mode.
>
>Please keep the commit message wrapped at 72-75 chars.
>
>Other than that:

Should I send new v6 patches with commit message wrapped at 72-75 chars?

Thanks.
>
>Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>
>
>> 
>> Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
>> ---
>>  drivers/gpu/drm/bridge/ite-it6505.c | 16 +++++++++++-----
>>  1 file changed, 11 insertions(+), 5 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c 
>> b/drivers/gpu/drm/bridge/ite-it6505.c
>> index 864fab7e388f..9a022c095af4 100644
>> --- a/drivers/gpu/drm/bridge/ite-it6505.c
>> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
>> @@ -126,6 +126,7 @@
>>  #define REG_AUX_OUT_DATA0 0x27
>>  
>>  #define REG_AUX_CMD_REQ 0x2B
>> +#define M_AUX_REQ_CMD 0x0F
>>  #define AUX_BUSY BIT(5)
>>  
>>  #define REG_AUX_DATA_0_7 0x2C
>> @@ -324,6 +325,9 @@ enum aux_cmd_type {
>>  	CMD_AUX_NATIVE_READ = 0x0,
>>  	CMD_AUX_NATIVE_WRITE = 0x5,
>>  	CMD_AUX_I2C_EDID_READ = 0xB,
>> +
>> +	/* KSV read with AUX FIFO extend from CMD_AUX_NATIVE_READ*/
>> +	CMD_AUX_GET_KSV_LIST = 0x10,
>>  };
>>  
>>  enum aux_cmd_reply {
>> @@ -965,7 +969,8 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
>>  	it6505_set_bits(it6505, REG_AUX_CTRL, AUX_USER_MODE, AUX_USER_MODE);
>>  
>>  aux_op_start:
>> -	if (cmd == CMD_AUX_I2C_EDID_READ) {
>> +	/* HW AUX FIFO supports only EDID and DCPD KSV FIFO area */
>> +	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
>>  		/* AUX EDID FIFO has max length of AUX_FIFO_MAX_SIZE bytes. */
>>  		size = min_t(size_t, size, AUX_FIFO_MAX_SIZE);
>>  		/* Enable AUX FIFO read back and clear FIFO */ @@ -996,7 +1001,7 @@ 
>> static ssize_t it6505_aux_operation(struct it6505 *it6505,
>>  				  size);
>>  
>>  	/* Aux Fire */
>> -	it6505_write(it6505, REG_AUX_CMD_REQ, cmd);
>> +	it6505_write(it6505, REG_AUX_CMD_REQ, FIELD_GET(M_AUX_REQ_CMD, 
>> +cmd));
>>  
>>  	ret = it6505_aux_wait(it6505);
>>  	if (ret < 0)
>> @@ -1030,7 +1035,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
>>  		goto aux_op_start;
>>  	}
>>  
>> -	if (cmd == CMD_AUX_I2C_EDID_READ) {
>> +	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
>>  		for (i = 0; i < size; i++) {
>>  			ret = it6505_read(it6505, REG_AUX_DATA_FIFO);
>>  			if (ret < 0)
>> @@ -1055,7 +1060,7 @@ static ssize_t it6505_aux_operation(struct it6505 *it6505,
>>  	ret = i;
>>  
>>  aux_op_err:
>> -	if (cmd == CMD_AUX_I2C_EDID_READ) {
>> +	if (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) {
>>  		/* clear AUX FIFO */
>>  		it6505_set_bits(it6505, REG_AUX_CTRL,
>>  				AUX_EN_FIFO_READ | CLR_EDID_FIFO, @@ -1076,7 +1081,8 @@ static 
>> ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
>>  				      size_t size, enum aux_cmd_reply *reply)  {
>>  	int i, ret_size, ret = 0, request_size;
>> -	int fifo_max_size = (cmd == CMD_AUX_I2C_EDID_READ) ? AUX_FIFO_MAX_SIZE : 4;
>> +	int fifo_max_size = (cmd == CMD_AUX_I2C_EDID_READ || cmd == CMD_AUX_GET_KSV_LIST) ?
>> +						 AUX_FIFO_MAX_SIZE : 4;
>>  
>>  	mutex_lock(&it6505->aux_lock);
>>  	i = 0;
>> --
>> 2.34.1
>> 
>
>-- 
>With best wishes
>Dmitry
>
>
BR,
Hermes

[PATCH v5 04/10] drm/bridge: it6505: Change definition MAX_HDCP_DOWN_STREAM_COUNT

[Hermes Wu]

From: Hermes Wu <Hermes.wu@ite.com.tw>

A HDCP source device shall support max downstream to 127 devices.
Change definition MAX_HDCP_DOWN_STREAM_COUNT to 127

KSVs shall save for DRM blocked devices check.
This results in struct it6505 growth by ~0.5 KiB.

Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 9a022c095af4..dde45e9b0f20 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -297,7 +297,7 @@
 #define MAX_LANE_COUNT 4
 #define MAX_LINK_RATE HBR
 #define AUTO_TRAIN_RETRY 3
-#define MAX_HDCP_DOWN_STREAM_COUNT 10
+#define MAX_HDCP_DOWN_STREAM_COUNT 127
 #define MAX_CR_LEVEL 0x03
 #define MAX_EQ_LEVEL 0x03
 #define AUX_WAIT_TIMEOUT_MS 15
-- 
2.34.1

Re: [PATCH v5 04/10] drm/bridge: it6505: Change definition MAX_HDCP_DOWN_STREAM_COUNT

[Dmitry Baryshkov]

On Tue, Oct 01, 2024 at 02:43:03PM +0800, Hermes Wu wrote:
> From: Hermes Wu <Hermes.wu@ite.com.tw>
> 
> A HDCP source device shall support max downstream to 127 devices.
> Change definition MAX_HDCP_DOWN_STREAM_COUNT to 127
> 
> KSVs shall save for DRM blocked devices check.
> This results in struct it6505 growth by ~0.5 KiB.
> 
> Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

Re: [PATCH v5 00/10]drm/bridge: it6505: fix HDCP CTS fail items and add MCCS support

[Dmitry Baryshkov]

On Tue, Oct 01, 2024 at 02:42:59PM +0800, Hermes Wu wrote:
> From: Hermes Wu <Hermes.wu@ite.com.tw>
> 
> This is a v5 patch-set.

Please check the way you are sending your patches. For some reason my
email client lists patches 0-4 separately, patches 6-8 as a separate
thread and patches 5, 9, 10 as individual patches. Please use single git
send-email command to send the whole patchset.

> 
> There are lots of failure items while running HDCP CTS using UNIGRAF DPR-100.
> In Order to fix those failures, HDCP flow needs to be changed.
> 
> The DisplayPort AUX protocol supports I2C transport.
> In Order to support MCCS via the aux channel, the aux-i2c operation is added.
> 
> v4 ->v5:
> 	-add more messages for changes.
> 	-[2/10] modified AUX transfer data size judgment.
> 		change for-loop to do-while.
> 	-[7/10] change for-loop to do-while.
> 	-[9/10] change wait timer with timer_after()
> 
> 	links:
> 	https://lore.kernel.org/all/20240926074755.22176-4-Hermes.Wu@ite.com.tw/
> 	https://lore.kernel.org/all/20240926075134.22394-1-Hermes.Wu@ite.com.tw/
> 
> v3 ->v4:
> 	-split changes  into patches.
> 
> v2- > v3:
> 	-split aux read  KSV function to a patch.
> 	-[1/3] new in v3
> 	-[2/3] add description of patch
> 
> v1 -> v2 :
> 	- ignored.
> 
> 
> 
> Hermes Wu (10):
>   drm/bridge: it6505: Change definition of AUX_FIFO_MAX_SIZE
>   drm/bridge: it6505: improve AUX operation for edid read
>   drm/bridge: it6505: add AUX operation for HDCP KSV list read
>   drm/bridge: it6505: Change definition MAX_HDCP_DOWN_STREAM_COUNT
>   drm/bridge: it6505: fix HDCP Bstatus check
>   drm/bridge: it6505: fix HDCP encryption when R0 ready
>   drm/bridge: it6505: fix HDCP CTS KSV list read with UNIGRAF DPR-100.
>   drm/bridge: it6505: fix HDCP CTS compare V matching
>   drm/bridge: it6505: fix HDCP CTS KSV list wait timer
>   drm/bridge: it6505: add I2C functionality on AUX
> 
>  drivers/gpu/drm/bridge/ite-it6505.c | 334 +++++++++++++++++++++++-----
>  1 file changed, 277 insertions(+), 57 deletions(-)
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry

RE: [PATCH v5 00/10]drm/bridge: it6505: fix HDCP CTS fail items and add MCCS support

[Hermes.Wu]

>
>-----Original Message-----
>From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> 
>Sent: Monday, October 14, 2024 10:06 PM
>To: Hermes Wu (吳佳宏) <Hermes.Wu@ite.com.tw>
>Cc: Pin-yen Lin <treapking@chromium.org>; Kenneth Hung (洪家倫) <Kenneth.Hung@ite.com.tw>; Pet Weng (翁玉芬) <Pet.Weng@ite.com.tw>; Allen Chen <allen.chen@ite.com.tw>; AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>; open list:DRM DRIVERS <dri-devel@lists.freedesktop.org>; Jernej Skrabec <jernej.skrabec@gmail.com>; Jonas Karlman <jonas@kwiboo.se>; Laurent Pinchart <Laurent.pinchart@ideasonboard.com>; open list <linux-kernel@vger.kernel.org>; Robert Foss <rfoss@kernel.org>
>Subject: Re: [PATCH v5 00/10]drm/bridge: it6505: fix HDCP CTS fail items and add MCCS support
>
>On Tue, Oct 01, 2024 at 02:42:59PM +0800, Hermes Wu wrote:
>> From: Hermes Wu <Hermes.wu@ite.com.tw>
>> 
>> This is a v5 patch-set.
>
>Please check the way you are sending your patches. For some reason my
>email client lists patches 0-4 separately, patches 6-8 as a separate
>thread and patches 5, 9, 10 as individual patches. Please use single git
>send-email command to send the whole patchset.

Sending patches use git send-email via smtp server in a short period of time
reach limits.

Next patches will try to use web submission endpoint

>> 
>> There are lots of failure items while running HDCP CTS using UNIGRAF DPR-100.
>> In Order to fix those failures, HDCP flow needs to be changed.
>> 
>> The DisplayPort AUX protocol supports I2C transport.
>> In Order to support MCCS via the aux channel, the aux-i2c operation is added.
>> 
>> v4 ->v5:
>> 	-add more messages for changes.
>> 	-[2/10] modified AUX transfer data size judgment.
>> 		change for-loop to do-while.
>> 	-[7/10] change for-loop to do-while.
>> 	-[9/10] change wait timer with timer_after()
>> 
>> 	links:
>> 	https://urldefense.com/v3/__https://lore.kernel.org/all/20240926074755.22176-4-Hermes.Wu@ite.com.tw/__;!!HtnLE8A!AHGwhLuU6axG3E60-Fc1M5cQVc_EUwgklnN1nc4YeDP3wvtVzTCo8I2tEcw-aFSDLxE-TDDjJgQHw6RYIfeJf4B4JETE$ 
>> 	https://urldefense.com/v3/__https://lore.kernel.org/all/20240926075134.22394-1-Hermes.Wu@ite.com.tw/__;!!HtnLE8A!AHGwhLuU6axG3E60-Fc1M5cQVc_EUwgklnN1nc4YeDP3wvtVzTCo8I2tEcw-aFSDLxE-TDDjJgQHw6RYIfeJf1ep_d4X$ 
>> 
>> v3 ->v4:
>> 	-split changes  into patches.
>> 
>> v2- > v3:
>> 	-split aux read  KSV function to a patch.
>> 	-[1/3] new in v3
>> 	-[2/3] add description of patch
>> 
>> v1 -> v2 :
>> 	- ignored.
>> 
>> 
>> 
>> Hermes Wu (10):
>>   drm/bridge: it6505: Change definition of AUX_FIFO_MAX_SIZE
>>   drm/bridge: it6505: improve AUX operation for edid read
>>   drm/bridge: it6505: add AUX operation for HDCP KSV list read
>>   drm/bridge: it6505: Change definition MAX_HDCP_DOWN_STREAM_COUNT
>>   drm/bridge: it6505: fix HDCP Bstatus check
>>   drm/bridge: it6505: fix HDCP encryption when R0 ready
>>   drm/bridge: it6505: fix HDCP CTS KSV list read with UNIGRAF DPR-100.
>>   drm/bridge: it6505: fix HDCP CTS compare V matching
>>   drm/bridge: it6505: fix HDCP CTS KSV list wait timer
>>   drm/bridge: it6505: add I2C functionality on AUX
>> 
>>  drivers/gpu/drm/bridge/ite-it6505.c | 334 +++++++++++++++++++++++-----
>>  1 file changed, 277 insertions(+), 57 deletions(-)
>> 
>> -- 
>> 2.34.1
>> 
>
>-- 
>With best wishes
>Dmitry
>
>
BR,
Hermes