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mfd: intel_quark_i2c_gpio: Don't crash if !DMI 

dmi_get_system_info() may return NULL either when CONFIG_DMI is not set or when
board has an old firmware. The patch prevents a crash and changes the default
frequency to be in align with older board.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[Lee: Removed overt "sentinel" comment and extra lines]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Andy Shevchenko 2015-03-25 20:03:55 +02:00 committed by Lee Jones
parent 0787ded88e
commit bafc1face2
1 changed files with 12 additions and 7 deletions
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19
drivers/mfd/intel_quark_i2c_gpio.c
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@ -70,6 +70,7 @@ static const struct i2c_mode_info platform_i2c_mode_info[] = {
.name = "GalileoGen2",
.i2c_scl_freq = 400000,
},
{}
};
static struct resource intel_quark_i2c_res[] = {
@ -153,10 +154,10 @@ static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev)
static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
{
const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
const struct i2c_mode_info *info;
struct dw_i2c_platform_data *pdata;
struct resource *res = (struct resource *)cell->resources;
struct device *dev = &pdev->dev;
unsigned int i;
res[INTEL_QUARK_IORES_MEM].start =
pci_resource_start(pdev, MFD_I2C_BAR);
@ -170,13 +171,17 @@ static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
if (!pdata)
return -ENOMEM;
/* Fast mode by default */
pdata->i2c_scl_freq = 400000;
/* Normal mode by default */
pdata->i2c_scl_freq = 100000;
for (i = 0; i < ARRAY_SIZE(platform_i2c_mode_info); i++)
if (!strcmp(board_name, platform_i2c_mode_info[i].name))
pdata->i2c_scl_freq
= platform_i2c_mode_info[i].i2c_scl_freq;
if (board_name) {
for (info = platform_i2c_mode_info; info->name; info++) {
if (!strcmp(board_name, info->name)) {
pdata->i2c_scl_freq = info->i2c_scl_freq;
break;
}
}
}
cell->platform_data = pdata;
cell->pdata_size = sizeof(*pdata);