drm: Add a new helper drm_color_ctm_s31_32_to_qm_n()

}

EXPORT_SYMBOL(drm_color_lut_extract);

/**

 * drm_color_ctm_s31_32_to_qm_n

 *

 * @user_input: input value

 * @m: number of integer bits, only support m <= 32, include the sign-bit

 * @n: number of fractional bits, only support n <= 32

 *

 * Convert and clamp S31.32 sign-magnitude to Qm.n (signed 2's complement).

 * The sign-bit BIT(m+n-1) and above are 0 for positive value and 1 for negative

 * the range of value is [-2^(m-1), 2^(m-1) - 2^-n]

 *

 * For example

 * A Q3.12 format number:

 * - required bit: 3 + 12 = 15bits

 * - range: [-2^2, 2^2 - 2^−15]

 *

 * NOTE: the m can be zero if all bit_precision are used to present fractional

 *       bits like Q0.32

 */

u64 drm_color_ctm_s31_32_to_qm_n(u64 user_input, u32 m, u32 n)

{

	u64 mag = (user_input & ~BIT_ULL(63)) >> (32 - n);

	bool negative = !!(user_input & BIT_ULL(63));

	s64 val;

	WARN_ON(m > 32 || n > 32);

	val = clamp_val(mag, 0, negative ?

				BIT_ULL(n + m - 1) : BIT_ULL(n + m - 1) - 1);

	return negative ? -val : val;

}

EXPORT_SYMBOL(drm_color_ctm_s31_32_to_qm_n);

/**

 * drm_crtc_enable_color_mgmt - enable color management properties

 * @crtc: DRM CRTC

struct drm_plane;

uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision);

u64 drm_color_ctm_s31_32_to_qm_n(u64 user_input, u32 m, u32 n);

void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,

				uint degamma_lut_size,