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media: i2c: imx477: Add control of FSTROBE via module parameters

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Copy the firmware's handling of FSTROBE, but using module parameters
instead of config.txt entries.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dave Stevenson
2023-08-23 18:54:27 +01:00
committed by Dom Cobley
parent eb08e16ec3
commit cccdee2326
1 changed files with 41 additions and 0 deletions
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41
drivers/media/i2c/imx477.c
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@@ -29,6 +29,22 @@ static int trigger_mode;
module_param(trigger_mode, int, 0644);
MODULE_PARM_DESC(trigger_mode, "Set vsync trigger mode: 1=source, 2=sink");
static int fstrobe_enable;
module_param(fstrobe_enable, int, 0644);
MODULE_PARM_DESC(fstrobe_enable, "Enable fstrobe signal");
static int fstrobe_cont_trig;
module_param(fstrobe_cont_trig, int, 0644);
MODULE_PARM_DESC(fstrobe_cont_trig, "Configure fstrobe to be one-shot (0) or continuous (1)");
static int fstrobe_width = 1;
module_param(fstrobe_width, int, 0644);
MODULE_PARM_DESC(fstrobe_width, "Set fstrobe pulse width in units of INCK");
static int fstrobe_delay;
module_param(fstrobe_delay, int, 0644);
MODULE_PARM_DESC(fstrobe_delay, "Set fstrobe delay from end all lines starting to expose and the start of the strobe pulse");
#define IMX477_REG_VALUE_08BIT 1
#define IMX477_REG_VALUE_16BIT 2
@@ -1791,6 +1807,8 @@ static int imx477_start_streaming(struct imx477 *imx477)
struct i2c_client *client = v4l2_get_subdevdata(&imx477->sd);
const struct imx477_reg_list *reg_list, *freq_regs;
const struct imx477_reg_list *extra_regs;
unsigned int fst_width;
unsigned int fst_mult;
int ret, tm;
if (!imx477->common_regs_written) {
@@ -1825,6 +1843,29 @@ static int imx477_start_streaming(struct imx477 *imx477)
return ret;
}
fst_width = max((unsigned int)fstrobe_width, 1U);
fst_mult = 1;
while (fst_width / fst_mult > 0xffff && fst_mult < 255)
fst_mult++;
fst_width /= fst_mult;
// FLASH_MD_RS
imx477_write_reg(imx477, 0x0c1A, IMX477_REG_VALUE_08BIT,
((!!fstrobe_cont_trig) | (1 << 1)));
// FLASH_STRB_WIDTH
imx477_write_reg(imx477, 0x0c18, IMX477_REG_VALUE_16BIT, fst_width);
// FLASH_STRB_WIDTH adjust
imx477_write_reg(imx477, 0x0c12, IMX477_REG_VALUE_08BIT, fst_mult);
// FLASH_STRB_START_POINT
imx477_write_reg(imx477, 0x0c14, IMX477_REG_VALUE_16BIT, fstrobe_delay);
// FLASH_STRB_DLY_RS
imx477_write_reg(imx477, 0x0c16, IMX477_REG_VALUE_16BIT, 0);
// FLASH_TRIG_RS
imx477_write_reg(imx477, 0x0c1B, IMX477_REG_VALUE_08BIT,
!!fstrobe_enable);
/* Set on-sensor DPC. */
imx477_write_reg(imx477, 0x0b05, IMX477_REG_VALUE_08BIT, !!dpc_enable);
imx477_write_reg(imx477, 0x0b06, IMX477_REG_VALUE_08BIT, !!dpc_enable);