diff options
| -rw-r--r-- | arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts | 1 | ||||
| -rw-r--r-- | arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts | 1 | ||||
| -rw-r--r-- | arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts | 1 | ||||
| -rw-r--r-- | drivers/fsi/fsi-master-gpio.c | 20 |
4 files changed, 19 insertions, 4 deletions
diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts b/arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts index 389f5f83bef9..0b9b37d4d6ef 100644 --- a/arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts +++ b/arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts @@ -52,6 +52,7 @@ compatible = "fsi-master-gpio", "fsi-master"; #address-cells = <2>; #size-cells = <0>; + no-gpio-delays; clock-gpios = <&gpio ASPEED_GPIO(AA, 0) GPIO_ACTIVE_HIGH>; data-gpios = <&gpio ASPEED_GPIO(AA, 2) GPIO_ACTIVE_HIGH>; diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts b/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts index 78a511e6e482..656036106001 100644 --- a/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts +++ b/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts @@ -153,6 +153,7 @@ compatible = "fsi-master-gpio", "fsi-master"; #address-cells = <2>; #size-cells = <0>; + no-gpio-delays; clock-gpios = <&gpio ASPEED_GPIO(AA, 0) GPIO_ACTIVE_HIGH>; data-gpios = <&gpio ASPEED_GPIO(E, 0) GPIO_ACTIVE_HIGH>; diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts b/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts index ccbf645ab84d..2c5aa90a546d 100644 --- a/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts +++ b/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts @@ -91,6 +91,7 @@ compatible = "fsi-master-gpio", "fsi-master"; #address-cells = <2>; #size-cells = <0>; + no-gpio-delays; trans-gpios = <&gpio ASPEED_GPIO(O, 6) GPIO_ACTIVE_HIGH>; enable-gpios = <&gpio ASPEED_GPIO(D, 0) GPIO_ACTIVE_HIGH>; diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c index d6508bbad1fb..c82bbd35276e 100644 --- a/drivers/fsi/fsi-master-gpio.c +++ b/drivers/fsi/fsi-master-gpio.c @@ -62,6 +62,7 @@ struct fsi_master_gpio { struct gpio_desc *gpio_enable; /* FSI enable */ struct gpio_desc *gpio_mux; /* Mux control */ bool external_mode; + bool no_delays; }; #define CREATE_TRACE_POINTS @@ -79,9 +80,11 @@ static void clock_toggle(struct fsi_master_gpio *master, int count) int i; for (i = 0; i < count; i++) { - ndelay(FSI_GPIO_STD_DLY); + if (!master->no_delays) + ndelay(FSI_GPIO_STD_DLY); gpiod_set_value(master->gpio_clk, 0); - ndelay(FSI_GPIO_STD_DLY); + if (!master->no_delays) + ndelay(FSI_GPIO_STD_DLY); gpiod_set_value(master->gpio_clk, 1); } } @@ -90,10 +93,12 @@ static int sda_clock_in(struct fsi_master_gpio *master) { int in; - ndelay(FSI_GPIO_STD_DLY); + if (!master->no_delays) + ndelay(FSI_GPIO_STD_DLY); gpiod_set_value(master->gpio_clk, 0); in = gpiod_get_value(master->gpio_data); - ndelay(FSI_GPIO_STD_DLY); + if (!master->no_delays) + ndelay(FSI_GPIO_STD_DLY); gpiod_set_value(master->gpio_clk, 1); return in ? 1 : 0; } @@ -677,6 +682,13 @@ static int fsi_master_gpio_probe(struct platform_device *pdev) } master->gpio_mux = gpio; + /* + * Check if GPIO block is slow enought that no extra delays + * are necessary. This improves performance on ast2500 by + * an order of magnitude. + */ + master->no_delays = device_property_present(&pdev->dev, "no-gpio-delays"); + master->master.n_links = 1; master->master.flags = FSI_MASTER_FLAG_SWCLOCK; master->master.read = fsi_master_gpio_read; |