英特爾xmm6321平臺camera閃光燈相關記錄

一、查看硬件閃光燈pin腳

二、修改相關pin腳功能

\linux\kernel\arch\arm\mach-xgold\include\mach\xgold_pinctrl\pcl_hal_cfg_xmm6321a2_es2_rk_tablet_sdk_v1.1.h

/* PCL_PAD_DIF_D7 (52) */
	{ 64, // GPIO_064
		{	{	PCL_HW_GPIO,  PCL_ENABLE | PCL_NO_PUPD | PCL_PUSH_PULL | PCL_DRV_CLASS_E | PCL_RESET_ALL |PCL_GPIO | PCL_GPIO_OUT | PCL_GPIO_D1, },
			{	PCL_HW_GPIO,  PCL_ENABLE | PCL_NO_PUPD | PCL_PUSH_PULL | PCL_DRV_CLASS_E | PCL_RESET_ALL |PCL_GPIO | PCL_GPIO_OUT | PCL_GPIO_D0, },
			{	PCL_HW_GPIO,  PCL_ENABLE | PCL_PU | PCL_PUSH_PULL | PCL_DRV_CLASS_E | PCL_RESET_ALL |PCL_GPIO | PCL_GPIO_IN  | PCL_GPIO_D0, }, }, },

三、控制該pin腳

linux\kernel\arch\arm\plat-xgold\dev-lcd-bl-tablet.c

int xgold_set_flash(int intensity)
{
	int ret;
	unsigned long pcl_state;

	pr_err("%s Enter intensity=%d\n", __func__,intensity);

	intensity ? (pcl_state = pcl_deactivate) : (pcl_state = pcl_activate);

	ret = pin_config_set("xmm6310-pinctrl", "PCL_PAD_DIF_D7",
								pcl_state);
	pr_debug("%s Exit\n", __func__);

	return 0;
}
EXPORT_SYMBOL_GPL(xgold_set_flash);

說明：
1.如果閃兩下覺得不妥，可以修改

linux\kernel\drivers\media\video\xgold\xgold-v4l2.c

int update_mi_mp(struct xgold_v4l2_device *xgold_v4l2)
{
	struct xgold_hardware *xgold_hw = &xgold_v4l2->xgold_hw;
	struct marvinconfig *marvin_config = &xgold_hw->marvin_config;
	int ret = 0;

	if (marvin_config->jpeg_config.enable) {
		/* in case of jpeg encoding, we don't have to disable the
		   MI, because the encoding
		   anyway has to be started explicitely */
		if (!marvin_config->jpeg_config.busy) {
			if ((xgold_hw->mp_dma_add ==
				 marvin_config->mi_config.mp.y_base)
				 && (xgold_hw->mp_dma_add !=
				marvin_config->mi_config.null_buff_dma_addr)) {
#ifdef CONFIG_CAMERA_FLASH_SUPPORT
				//if (xgold_hw->xgold_flash_enable == FLASH_ON)
					//xgold_set_flash(1);//去掉此句，
#endif

2.閃光燈延遲時間調整
Y:\work\bak-xmm6321\kitkat\hardware\intel\libcamera_native\Camera.h
#define CAMERA_PRE_SHOT_FLASH_US (1000 * 1000)