diff options
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c | 49 |
1 files changed, 42 insertions, 7 deletions
diff --git a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c index 1af9da8acf4c..cb360b8399e5 100644 --- a/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c +++ b/drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c @@ -26,6 +26,9 @@ enum clock_rate { #define CLK_RATE_19_2MHZ 19200000 #define CLK_RATE_25_0MHZ 25000000 +/* Valid clock number range from 0 to 5 */ +#define MAX_CLK_COUNT 5 + /* X-Powers AXP288 register set */ #define ALDO1_SEL_REG 0x28 #define ALDO1_CTRL3_REG 0x13 @@ -61,7 +64,6 @@ enum clock_rate { struct gmin_subdev { struct v4l2_subdev *subdev; - int clock_num; enum clock_rate clock_src; bool clock_on; struct clk *pmc_clk; @@ -447,7 +449,7 @@ static struct gmin_subdev *gmin_subdev_add(struct v4l2_subdev *subdev) struct acpi_device *adev; acpi_handle handle; struct device *dev; - int i, ret; + int i, ret, clock_num; if (!client) return NULL; @@ -492,17 +494,37 @@ static struct gmin_subdev *gmin_subdev_add(struct v4l2_subdev *subdev) } gmin_subdevs[i].subdev = subdev; - gmin_subdevs[i].clock_num = gmin_get_var_int(dev, false, "CamClk", 0); + /*WA:CHT requires XTAL clock as PLL is not stable.*/ gmin_subdevs[i].clock_src = gmin_get_var_int(dev, false, "ClkSrc", VLV2_CLK_PLL_19P2MHZ); gmin_subdevs[i].csi_port = gmin_get_var_int(dev, false, "CsiPort", 0); gmin_subdevs[i].csi_lanes = gmin_get_var_int(dev, false, "CsiLanes", 1); - /* get PMC clock with clock framework */ - snprintf(gmin_pmc_clk_name, - sizeof(gmin_pmc_clk_name), - "%s_%d", "pmc_plt_clk", gmin_subdevs[i].clock_num); + /* + * FIXME: + * + * According with : + * https://github.com/projectceladon/hardware-intel-kernelflinger/blob/master/doc/fastboot.md + * + * The "CamClk" EFI var is set via fastboot on some Android devices, + * and seems to contain the number of the clock used to feed the + * sensor. + * + * On systems with a proper ACPI table, this is given via the _PR0 + * power resource table. The logic below should first check if there + * is a power resource already, falling back to the EFI vars detection + * otherwise. + */ + clock_num = gmin_get_var_int(dev, false, "CamClk", -1); + + if (clock_num < 0 || clock_num > MAX_CLK_COUNT) { + dev_err(dev, "Invalid clock number\n"); + return NULL; + } + + snprintf(gmin_pmc_clk_name, sizeof(gmin_pmc_clk_name), + "%s_%d", "pmc_plt_clk", clock_num); gmin_subdevs[i].pmc_clk = devm_clk_get(dev, gmin_pmc_clk_name); if (IS_ERR(gmin_subdevs[i].pmc_clk)) { @@ -515,6 +537,7 @@ static struct gmin_subdev *gmin_subdev_add(struct v4l2_subdev *subdev) return NULL; } + dev_info(dev, "Will use CLK%d (%s)\n", clock_num, gmin_pmc_clk_name); /* * The firmware might enable the clock at @@ -957,6 +980,18 @@ static int gmin_get_config_dsm_var(struct device *dev, union acpi_object *obj, *cur = NULL; int i; + /* + * The data reported by "CamClk" seems to be either 0 or 1 at the + * _DSM table. + * + * At the ACPI tables we looked so far, this is not related to the + * actual clock source for the sensor, which is given by the + * _PR0 ACPI table. So, ignore it, as otherwise this will be + * set to a wrong value. + */ + if (!strcmp(var, "CamClk")) + return -EINVAL; + obj = acpi_evaluate_dsm(handle, &atomisp_dsm_guid, 0, 0, NULL); if (!obj) { dev_info_once(dev, "Didn't find ACPI _DSM table.\n"); |