i2c: sh_mobile: check timing parameters for valid range

Due to misconfiguration, it can happen that the calculated timing
parameters are out of range. Bail out if that happens. We can also
simplify some logic later because of the verified value. Also, make the
printouts of the values more precise by adding the hex-prefixes.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit 7663ebefca8079ef0fd2fff1047d3d10af654c78)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 9f02013..b1d399e 100644 (file)
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -232,6 +232,7 @@ static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
 {
        unsigned long i2c_clk_khz;
        u32 tHIGH, tLOW, tf;
+       uint16_t max_val;
 
        /* Get clock rate after clock is enabled */
        clk_prepare_enable(pd->clk);
@@ -254,15 +255,23 @@ static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
        }
 
        pd->iccl = sh_mobile_i2c_iccl(i2c_clk_khz, tLOW, tf);
+       pd->icch = sh_mobile_i2c_icch(i2c_clk_khz, tHIGH, tf);
+
+       max_val = pd->flags & IIC_FLAG_HAS_ICIC67 ? 0x1ff : 0xff;
+       if (pd->iccl > max_val || pd->icch > max_val) {
+               dev_err(pd->dev, "timing values out of range: L/H=0x%x/0x%x\n",
+                       pd->iccl, pd->icch);
+               return -EINVAL;
+       }
+
        /* one more bit of ICCL in ICIC */
-       if ((pd->iccl > 0xff) && (pd->flags & IIC_FLAG_HAS_ICIC67))
+       if (pd->iccl & 0x100)
                pd->icic |= ICIC_ICCLB8;
        else
                pd->icic &= ~ICIC_ICCLB8;
 
-       pd->icch = sh_mobile_i2c_icch(i2c_clk_khz, tHIGH, tf);
        /* one more bit of ICCH in ICIC */
-       if ((pd->icch > 0xff) && (pd->flags & IIC_FLAG_HAS_ICIC67))
+       if (pd->icch & 0x100)
                pd->icic |= ICIC_ICCHB8;
        else
                pd->icic &= ~ICIC_ICCHB8;
@@ -717,7 +726,7 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
        }
 
        dev_info(&dev->dev,
-                "I2C adapter %d with bus speed %lu Hz (L/H=%x/%x)\n",
+                "I2C adapter %d with bus speed %lu Hz (L/H=0x%x/0x%x)\n",
                 adap->nr, pd->bus_speed, pd->iccl, pd->icch);
 
        return 0;