gpio-mxs: Select faster gpio-generic set methods

From: Simon Pearson <[email protected]>

Kernel 3.8.4. By defining both the set and clear registers, the speed of the gpio isimproved. gpio-generic.c, selects the bgpio_set_with_clear() which isfaster than the current bgpio_set_set(). This has performance implications for all bitbang drivers (i2c, spi, etc). Slow SPI as compared to 2.6.35.33 improved by a factor of 10 (80kHz CLK to 800kHz CLK).

Signed-off-by Simon Pearson <[email protected]>

---

drivers/gpio/gpio-mxs.c 2013-06-21 10:02:33.000000000 -0700 renamed from drivers/gpio/gpio-mxs.c.orig 2013-03-20 13:11:19.000000000 -0700 +2 -1

@@ -292,7 +292,8 @@ static int mxs_gpio_probe(struct platfor
 
     err = bgpio_init(&port->bgc, &pdev->dev, 4,
              port->base + PINCTRL_DIN(port),
-             port->base + PINCTRL_DOUT(port), NULL,
+             port->base + PINCTRL_DOUT(port) + MXS_SET,
+             port->base + PINCTRL_DOUT(port) + MXS_CLR,
              port->base + PINCTRL_DOE(port), NULL, 0);
     if (err)
         goto out_irqdesc_free;