On Tue, Jun 26, 2018 at 06:53:47AM +0530, Balakrishna Godavarthi wrote:

Hi Matthias,

On 2018-06-26 04:50, Matthias Kaehlcke wrote:

quoted

On Mon, Jun 25, 2018 at 07:10:09PM +0530, Balakrishna Godavarthi wrote:

quoted

Redefinition of qca_uart_setup will help future Qualcomm Bluetooth
SoC, to use the same function instead of duplicating the function.
Added new arguments soc_type and soc_ver to the functions.

These arguments will help to decide type of firmware files
to be loaded into Bluetooth chip.
soc_type holds the Bluetooth chip connected to APPS processor.
soc_ver holds the Bluetooth chip version.

Signed-off-by: Balakrishna Godavarthi <redacted>
---
Changes in v8:
    * updated soc_type with enum.

Changes in v7:
    * initial patch
    * redefined qca_uart_setup function to generic.
---
 drivers/bluetooth/btqca.c   | 23 ++++++++++++-----------
 drivers/bluetooth/btqca.h   | 13 +++++++++++--
 drivers/bluetooth/hci_qca.c |  3 ++-
 3 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index c5cf9cab438a..3b25be1be19c 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c

@@ -327,9 +327,9 @@ int qca_set_bdaddr_rome(struct hci_dev *hdev,

const bdaddr_t *bdaddr)
 }
 EXPORT_SYMBOL_GPL(qca_set_bdaddr_rome);

-int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate)
+int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
+		   enum qca_btsoc_type soc_type, u32 soc_ver)
 {
-	u32 rome_ver = 0;
 	struct rome_config config;
 	int err;

@@ -337,19 +337,20 @@ int qca_uart_setup(struct hci_dev *hdev,

uint8_t baudrate)

 	config.user_baud_rate = baudrate;

-	/* Get QCA version information */
-	err = qca_read_soc_version(hdev, &rome_ver);
-	if (err < 0 || rome_ver == 0) {
-		bt_dev_err(hdev, "QCA Failed to get version %d", err);
-		return err;
+	if (!soc_ver) {
+		/* Get QCA version information */
+		err = qca_read_soc_version(hdev, &soc_ver);
+		if (err < 0 || soc_ver == 0) {
+			bt_dev_err(hdev, "QCA Failed to get version (%d)", err);
+			return err;
+		}
+		bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
 	}

I thought we agreed in the discussion on "[v7,4/8] Bluetooth: btqca:
Redefine qca_uart_setup() to generic function" to call
qca_read_soc_version() in common code. Did I misinterpret that?

[Bala]: After integrating wcn3990, calling qca_read_soc_version() in
qca_setup()
        is not preferable. as we will have multiple common blocks of code in
qca_setup.
        calling function to set an operator speed is required in the both
the if -else blcoks

We can probably agree that there is no ideal solution, there is some
ugliness in on way or the other. IMO the conditional
qca_read_soc_version() in qca_uart_setup() based on the vale of
'soc_ver' is far worse than a small piece of redundant code.

If qca_read_soc_version() was done in qca_setup() the code could look
something like this:

static int qca_setup(struct hci_uart *hu)
{
	...
	if (qcadev->btsoc_type == QCA_WCN3990) {
		...
		qca_read_soc_version();
		ret = qca_set_speed(hu, QCA_OPER_SPEED);
                if (ret)
                        return ret;
	} else {
		ret = qca_set_speed(hu, QCA_OPER_SPEED);
                if (ret)
                        return ret;
                qca_read_soc_version();
	}

	speed = qca_get_speed(hu, QCA_OPER_SPEED);
	qca_baudrate = qca_get_baudrate_value(speed);

	 /* Setup patch / NVM configurations */
        ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type, soc_ver);
	...
}

Yes, 'qca_set_speed(hu, QCA_OPER_SPEED)' and the error handling is
redundant, but it's only 3 lines of trivial code in exchange for
making qca_uart_setup() more consistent and not spreading
the qca_read_soc_version() calls over multiple files, depending on the
SoC version.

If you are super-convinced that the split is superior leave it as is,
I might already be doing too much bike-shedding, and after all it
isn't my code.

quoted

quoted

diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
index 5c9851b11838..24d6667eecf1 100644
--- a/drivers/bluetooth/btqca.h
+++ b/drivers/bluetooth/btqca.h

...
-static inline int qca_uart_setup(struct hci_dev *hdev, uint8_t
baudrate)
+static inline int qca_uart_setup(struct hci_dev *hdev, uint8_t
baudrate,
+				 enum qca_btsoc_type soc_type, u32 soc_ver);

Remove trailing semicolon.

[Bala]: i didn't get you.

Sorry, I should have left more context:

static inline int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
				 enum qca_btsoc_type soc_type, u32 soc_ver);
{
	return -EOPNOTSUPP;
}

This is a function definition, not just a declaration. The semicolon
would make it a declaration and make the compiler unhappy about a
function body where it doesn't expect it.