| Message ID | 1601445926-23673-1-git-send-email-parashar@codeaurora.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [V6] serial: qcom_geni_serial: To correct QUP Version detection logic | expand |
On 9/30/2020 11:35 AM, Paras Sharma wrote: > For QUP IP versions 2.5 and above the oversampling rate is > halved from 32 to 16. > > Commit ce734600545f ("tty: serial: qcom_geni_serial: Update > the oversampling rate") is pushed to handle this scenario. > But the existing logic is failing to classify QUP Version 3.0 > into the correct group ( 2.5 and above). > > As result Serial Engine clocks are not configured properly for > baud rate and garbage data is sampled to FIFOs from the line. > > So, fix the logic to detect QUP with versions 2.5 and above. > > Fixes: ce734600545f ("tty: serial: qcom_geni_serial: Update the oversampling rate") > Signed-off-by: Paras Sharma <parashar@codeaurora.org> Reviewed-by: Akash Asthana <akashast@codeaurora.org> -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index f0b1b47..464ffc9 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -1000,7 +1000,7 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport, sampling_rate = UART_OVERSAMPLING; /* Sampling rate is halved for IP versions >= 2.5 */ ver = geni_se_get_qup_hw_version(&port->se); - if (GENI_SE_VERSION_MAJOR(ver) >= 2 && GENI_SE_VERSION_MINOR(ver) >= 5) + if (ver >= QUP_SE_VERSION_2_5) sampling_rate /= 2; clk_rate = get_clk_div_rate(baud, sampling_rate, &clk_div); diff --git a/include/linux/qcom-geni-se.h b/include/linux/qcom-geni-se.h index 8f385fb..1c31f26 100644 --- a/include/linux/qcom-geni-se.h +++ b/include/linux/qcom-geni-se.h @@ -248,6 +248,9 @@ struct geni_se { #define GENI_SE_VERSION_MINOR(ver) ((ver & HW_VER_MINOR_MASK) >> HW_VER_MINOR_SHFT) #define GENI_SE_VERSION_STEP(ver) (ver & HW_VER_STEP_MASK) +/* QUP SE VERSION value for major number 2 and minor number 5 */ +#define QUP_SE_VERSION_2_5 0x20050000 + /* * Define bandwidth thresholds that cause the underlying Core 2X interconnect * clock to run at the named frequency. These baseline values are recommended
For QUP IP versions 2.5 and above the oversampling rate is halved from 32 to 16. Commit ce734600545f ("tty: serial: qcom_geni_serial: Update the oversampling rate") is pushed to handle this scenario. But the existing logic is failing to classify QUP Version 3.0 into the correct group ( 2.5 and above). As result Serial Engine clocks are not configured properly for baud rate and garbage data is sampled to FIFOs from the line. So, fix the logic to detect QUP with versions 2.5 and above. Fixes: ce734600545f ("tty: serial: qcom_geni_serial: Update the oversampling rate") Signed-off-by: Paras Sharma <parashar@codeaurora.org> --- Changes in V6: Removed newline unneeded change Changes in V5: Moved QUP_SE_VERSION_2_5 to common header file qcom-geni-se.h Changes in V4: Created a new #define QUP_SE_VERSION_2_5 for Qup serial engine having version 2.5 Changes in V3: Replaced the condition for detecting Qup version(2.5 or greater) with value 0x20050000 Changes in V2: Changed subject line and logic for checking Qup version drivers/tty/serial/qcom_geni_serial.c | 2 +- include/linux/qcom-geni-se.h | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-)