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[34.78.140.88]) by smtp.gmail.com with ESMTPSA id fm16-20020a05600c0c1000b0040ea10178f3sm77470wmb.21.2024.01.19.02.45.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jan 2024 02:45:44 -0800 (PST) From: Tudor Ambarus To: gregkh@linuxfoundation.org, jirislaby@kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org Cc: alim.akhtar@samsung.com, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, andre.draszik@linaro.org, kernel-team@android.com, peter.griffin@linaro.org, semen.protsenko@linaro.org, willmcvicker@google.com, Tudor Ambarus Subject: [PATCH v2 17/19] tty: serial: samsung: shrink the clock selection to 8 clocks Date: Fri, 19 Jan 2024 10:45:24 +0000 Message-ID: <20240119104526.1221243-18-tudor.ambarus@linaro.org> X-Mailer: git-send-email 2.43.0.429.g432eaa2c6b-goog In-Reply-To: <20240119104526.1221243-1-tudor.ambarus@linaro.org> References: <20240119104526.1221243-1-tudor.ambarus@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" provides a clock selection pool of maximum 4 clocks. Update the driver to consider a pool selection of maximum 8 clocks. u8 is large enough to allow more clocks than are supported by the driver now, and not too big to cause spanning of ``struct s3c24xx_uart_info`` through 2 cachelines when compiled for arm64. The goal is to reduce the memory footprint of ``struct s3c24xx_uart_info``. Reviewed-by: Sam Protsenko Signed-off-by: Tudor Ambarus --- drivers/tty/serial/samsung_tty.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_= tty.c index 149f618e22ce..c429029c0207 100644 --- a/drivers/tty/serial/samsung_tty.c +++ b/drivers/tty/serial/samsung_tty.c @@ -81,11 +81,11 @@ struct s3c24xx_uart_info { unsigned long tx_fifomask; unsigned long tx_fifoshift; unsigned long tx_fifofull; - unsigned int def_clk_sel; - unsigned long num_clks; unsigned long clksel_mask; unsigned long clksel_shift; unsigned long ucon_mask; + u8 def_clk_sel; + u8 num_clks; u8 iotype; =20 /* uart port features */ @@ -1340,7 +1340,7 @@ static void s3c24xx_serial_pm(struct uart_port *port,= unsigned int level, =20 #define MAX_CLK_NAME_LENGTH 15 =20 -static inline int s3c24xx_serial_getsource(struct uart_port *port) +static inline u8 s3c24xx_serial_getsource(struct uart_port *port) { const struct s3c24xx_uart_info *info =3D s3c24xx_port_to_info(port); u32 ucon; @@ -1353,8 +1353,7 @@ static inline int s3c24xx_serial_getsource(struct uar= t_port *port) return ucon >> info->clksel_shift; } =20 -static void s3c24xx_serial_setsource(struct uart_port *port, - unsigned int clk_sel) +static void s3c24xx_serial_setsource(struct uart_port *port, u8 clk_sel) { const struct s3c24xx_uart_info *info =3D s3c24xx_port_to_info(port); u32 ucon; @@ -1373,14 +1372,15 @@ static void s3c24xx_serial_setsource(struct uart_po= rt *port, =20 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourpor= t, unsigned int req_baud, struct clk **best_clk, - unsigned int *clk_num) + u8 *clk_num) { const struct s3c24xx_uart_info *info =3D ourport->info; struct clk *clk; unsigned long rate; - unsigned int cnt, baud, quot, best_quot =3D 0; + unsigned int baud, quot, best_quot =3D 0; char clkname[MAX_CLK_NAME_LENGTH]; int calc_deviation, deviation =3D (1 << 30) - 1; + u8 cnt; =20 for (cnt =3D 0; cnt < info->num_clks; cnt++) { /* Keep selected clock if provided */ @@ -1473,9 +1473,10 @@ static void s3c24xx_serial_set_termios(struct uart_p= ort *port, struct s3c24xx_uart_port *ourport =3D to_ourport(port); struct clk *clk =3D ERR_PTR(-EINVAL); unsigned long flags; - unsigned int baud, quot, clk_sel =3D 0; + unsigned int baud, quot; unsigned int udivslot =3D 0; u32 ulcon, umcon; + u8 clk_sel =3D 0; =20 /* * We don't support modem control lines. @@ -1776,10 +1777,9 @@ static int s3c24xx_serial_enable_baudclk(struct s3c2= 4xx_uart_port *ourport) struct device *dev =3D ourport->port.dev; const struct s3c24xx_uart_info *info =3D ourport->info; char clk_name[MAX_CLK_NAME_LENGTH]; - unsigned int clk_sel; struct clk *clk; - int clk_num; int ret; + u8 clk_sel, clk_num; =20 clk_sel =3D ourport->cfg->clk_sel ? : info->def_clk_sel; for (clk_num =3D 0; clk_num < info->num_clks; clk_num++) { @@ -2287,9 +2287,9 @@ s3c24xx_serial_get_options(struct uart_port *port, in= t *baud, { struct clk *clk; unsigned long rate; - unsigned int clk_sel; u32 ulcon, ucon, ubrdiv; char clk_name[MAX_CLK_NAME_LENGTH]; + u8 clk_sel; =20 ulcon =3D rd_regl(port, S3C2410_ULCON); ucon =3D rd_regl(port, S3C2410_UCON); --=20 2.43.0.429.g432eaa2c6b-goog