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X-MS-Exchange-CrossTenant-userprincipalname: DPeNBn9ziqmj2OeRHqRMvKD5AwVX2O/WuCeNJ88qLlXmRUWPtG227/4M51GzXCduMLF9S4Q4prICASgpbvaPZ5NsX6UjadkVjw99BsVMDtA= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR11MB6694 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220920_232719_670136_4F7DE590 X-CRM114-Status: GOOD ( 25.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 21.09.2022 08:51, Claudiu Beznea - M18063 wrote: > On 19.09.2022 18:08, Sergiu Moga wrote: >> Previously, the atmel serial driver did not take into account the >> possibility of using the more customizable generic clock as its >> baudrate generator. Unless there is a Fractional Part available to >> increase accuracy, there is a high chance that we may be able to >> generate a baudrate closer to the desired one by using the GCLK as the >> clock source. Now, depending on the error rate between >> the desired baudrate and the actual baudrate, the serial driver will >> fallback on the generic clock. The generic clock must be provided >> in the DT node of the serial that may need a more flexible clock source. >> >> Signed-off-by: Sergiu Moga > > Reviewed-by: Claudiu Beznea Actually, I'm taking this back at the moment. > > >> --- >> >> >> v1 -> v2: >> - take into account the different placement of the baudrate clock source >> into the IP's Mode Register (USART vs UART) >> - don't check for atmel_port->gclk != NULL >> - use clk_round_rate instead of clk_set_rate + clk_get_rate >> - remove clk_disable_unprepare from the end of the probe method >> >> >> >> v2 -> v3: >> - add the error rate calculation function as an inline function instead of >> a macro definition >> - add `gclk_fail` goto >> - replace `goto err` with `goto err_clk_disable_unprepare;` >> >> >> >> v3 -> v4: >> - Nothing, this was previously [PATCH 14] >> >> >> drivers/tty/serial/atmel_serial.c | 59 ++++++++++++++++++++++++++++++- >> 1 file changed, 58 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c >> index c983798a4ab2..426f9d4f9a5a 100644 >> --- a/drivers/tty/serial/atmel_serial.c >> +++ b/drivers/tty/serial/atmel_serial.c >> @@ -15,6 +15,7 @@ >> #include >> #include >> #include >> +#include >> #include >> #include >> #include >> @@ -110,6 +111,7 @@ struct atmel_uart_char { >> struct atmel_uart_port { >> struct uart_port uart; /* uart */ >> struct clk *clk; /* uart clock */ >> + struct clk *gclk; /* uart generic clock */ >> int may_wakeup; /* cached value of device_may_wakeup for times we need to disable it */ >> u32 backup_imr; /* IMR saved during suspend */ >> int break_active; /* break being received */ >> @@ -229,6 +231,11 @@ static inline int atmel_uart_is_half_duplex(struct uart_port *port) >> (port->iso7816.flags & SER_ISO7816_ENABLED); >> } >> >> +static inline int atmel_error_rate(int desired_value, int actual_value) >> +{ >> + return 100 - (desired_value * 100) / actual_value; >> +} >> + >> #ifdef CONFIG_SERIAL_ATMEL_PDC >> static bool atmel_use_pdc_rx(struct uart_port *port) >> { >> @@ -2117,6 +2124,8 @@ static void atmel_serial_pm(struct uart_port *port, unsigned int state, >> * This is called on uart_close() or a suspend event. >> */ >> clk_disable_unprepare(atmel_port->clk); >> + if (__clk_is_enabled(atmel_port->gclk)) >> + clk_disable_unprepare(atmel_port->gclk); >> break; >> default: >> dev_err(port->dev, "atmel_serial: unknown pm %d\n", state); >> @@ -2132,7 +2141,9 @@ static void atmel_set_termios(struct uart_port *port, >> { >> struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); >> unsigned long flags; >> - unsigned int old_mode, mode, imr, quot, baud, div, cd, fp = 0; >> + unsigned int old_mode, mode, imr, quot, div, cd, fp = 0; >> + unsigned int baud, actual_baud, gclk_rate; >> + int ret; >> >> /* save the current mode register */ >> mode = old_mode = atmel_uart_readl(port, ATMEL_US_MR); >> @@ -2302,6 +2313,46 @@ static void atmel_set_termios(struct uart_port *port, >> cd = min_t(unsigned int, cd, ATMEL_US_CD); >> } >> >> + /* >> + * If there is no Fractional Part, there is a high chance that >> + * we may be able to generate a baudrate closer to the desired one >> + * if we use the GCLK as the clock source driving the baudrate >> + * generator. >> + */ >> + if (!atmel_port->has_frac_baudrate) { >> + if (__clk_is_enabled(atmel_port->gclk)) >> + clk_disable_unprepare(atmel_port->gclk); >> + gclk_rate = clk_round_rate(atmel_port->gclk, 16 * baud); >> + actual_baud = clk_get_rate(atmel_port->clk) / (16 * cd); >> + if (gclk_rate && abs(atmel_error_rate(baud, actual_baud)) > >> + abs(atmel_error_rate(baud, gclk_rate / 16))) { If this condition fails and you previously used GCLK for clock generation you should remove bits ATMEL_US_USCLKS or ATMEL_UA_BRSRCCK from mode variable, to avoid configuring MR with GCLK support and clock not being properly setup. >> + clk_set_rate(atmel_port->gclk, 16 * baud); >> + ret = clk_prepare_enable(atmel_port->gclk); >> + if (ret) >> + goto gclk_fail; >> + >> + if (atmel_port->is_usart) { >> + mode &= ~ATMEL_US_USCLKS; >> + mode |= ATMEL_US_USCLKS_GCLK; >> + } else { >> + mode &= ~ATMEL_UA_BRSRCCK; >> + mode |= ATMEL_UA_BRSRCCK_GCLK; >> + } >> + >> + /* >> + * Set the Clock Divisor for GCLK to 1. >> + * Since we were able to generate the smallest >> + * multiple of the desired baudrate times 16, >> + * then we surely can generate a bigger multiple >> + * with the exact error rate for an equally increased >> + * CD. Thus no need to take into account >> + * a higher value for CD. >> + */ >> + cd = 1; >> + } >> + } >> + >> +gclk_fail: >> quot = cd | fp << ATMEL_US_FP_OFFSET; >> >> if (!(port->iso7816.flags & SER_ISO7816_ENABLED)) >> @@ -2897,6 +2948,12 @@ static int atmel_serial_probe(struct platform_device *pdev) >> if (ret) >> goto err; >> >> + atmel_port->gclk = devm_clk_get_optional(&pdev->dev, "gclk"); >> + if (IS_ERR(atmel_port->gclk)) { >> + ret = PTR_ERR(atmel_port->gclk); >> + goto err_clk_disable_unprepare; >> + } >> + >> ret = atmel_init_port(atmel_port, pdev); >> if (ret) >> goto err_clk_disable_unprepare; > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel