diff options
Diffstat (limited to 'drivers/media/i2c/mt9p031.c')
| -rw-r--r-- | drivers/media/i2c/mt9p031.c | 49 |
1 files changed, 45 insertions, 4 deletions
diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c index 192c4aad05d6..33daace81297 100644 --- a/drivers/media/i2c/mt9p031.c +++ b/drivers/media/i2c/mt9p031.c @@ -78,6 +78,9 @@ #define MT9P031_PLL_CONFIG_1 0x11 #define MT9P031_PLL_CONFIG_2 0x12 #define MT9P031_PIXEL_CLOCK_CONTROL 0x0a +#define MT9P031_PIXEL_CLOCK_INVERT (1 << 15) +#define MT9P031_PIXEL_CLOCK_SHIFT(n) ((n) << 8) +#define MT9P031_PIXEL_CLOCK_DIVIDE(n) ((n) << 0) #define MT9P031_FRAME_RESTART 0x0b #define MT9P031_SHUTTER_DELAY 0x0c #define MT9P031_RST 0x0d @@ -130,6 +133,8 @@ struct mt9p031 { enum mt9p031_model model; struct aptina_pll pll; + unsigned int clk_div; + bool use_pll; int reset; struct v4l2_ctrl_handler ctrls; @@ -198,6 +203,11 @@ static int mt9p031_reset(struct mt9p031 *mt9p031) if (ret < 0) return ret; + ret = mt9p031_write(client, MT9P031_PIXEL_CLOCK_CONTROL, + MT9P031_PIXEL_CLOCK_DIVIDE(mt9p031->clk_div)); + if (ret < 0) + return ret; + return mt9p031_set_output_control(mt9p031, MT9P031_OUTPUT_CONTROL_CEN, 0); } @@ -222,15 +232,34 @@ static int mt9p031_clk_setup(struct mt9p031 *mt9p031) struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev); struct mt9p031_platform_data *pdata = mt9p031->pdata; + int ret; mt9p031->clk = devm_clk_get(&client->dev, NULL); if (IS_ERR(mt9p031->clk)) return PTR_ERR(mt9p031->clk); - clk_set_rate(mt9p031->clk, pdata->ext_freq); + ret = clk_set_rate(mt9p031->clk, pdata->ext_freq); + if (ret < 0) + return ret; + + /* If the external clock frequency is out of bounds for the PLL use the + * pixel clock divider only and disable the PLL. + */ + if (pdata->ext_freq > limits.ext_clock_max) { + unsigned int div; + + div = DIV_ROUND_UP(pdata->ext_freq, pdata->target_freq); + div = roundup_pow_of_two(div) / 2; + + mt9p031->clk_div = max_t(unsigned int, div, 64); + mt9p031->use_pll = false; + + return 0; + } mt9p031->pll.ext_clock = pdata->ext_freq; mt9p031->pll.pix_clock = pdata->target_freq; + mt9p031->use_pll = true; return aptina_pll_calculate(&client->dev, &limits, &mt9p031->pll); } @@ -240,6 +269,9 @@ static int mt9p031_pll_enable(struct mt9p031 *mt9p031) struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev); int ret; + if (!mt9p031->use_pll) + return 0; + ret = mt9p031_write(client, MT9P031_PLL_CONTROL, MT9P031_PLL_CONTROL_PWRON); if (ret < 0) @@ -265,6 +297,9 @@ static inline int mt9p031_pll_disable(struct mt9p031 *mt9p031) { struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev); + if (!mt9p031->use_pll) + return 0; + return mt9p031_write(client, MT9P031_PLL_CONTROL, MT9P031_PLL_CONTROL_PWROFF); } @@ -285,9 +320,15 @@ static int mt9p031_power_on(struct mt9p031 *mt9p031) if (ret < 0) return ret; - /* Emable clock */ - if (mt9p031->clk) - clk_prepare_enable(mt9p031->clk); + /* Enable clock */ + if (mt9p031->clk) { + ret = clk_prepare_enable(mt9p031->clk); + if (ret) { + regulator_bulk_disable(ARRAY_SIZE(mt9p031->regulators), + mt9p031->regulators); + return ret; + } + } /* Now RESET_BAR must be high */ if (gpio_is_valid(mt9p031->reset)) { |