drm/tegra: dsi: Adjust D-PHY timing

#include "mipi-phy.h"

/*

 * Default D-PHY timings based on MIPI D-PHY specification. Derived from

 * the valid ranges specified in Section 5.9 of the D-PHY specification

 * with minor adjustments.

 * Default D-PHY timings based on MIPI D-PHY specification. Derived from the

 * valid ranges specified in Section 6.9, Table 14, Page 40 of the D-PHY

 * specification (v1.2) with minor adjustments.

 */

int mipi_dphy_timing_get_default(struct mipi_dphy_timing *timing,

				 unsigned long period)

	timing->hszero = 145 + 5 * period;

	timing->hssettle = 85 + 6 * period;

	timing->hsskip = 40;

	timing->hstrail = max(8 * period, 60 + 4 * period);

	/*

	 * The MIPI D-PHY specification (Section 6.9, v1.2, Table 14, Page 40)

	 * contains this formula as:

	 *

	 *     T_HS-TRAIL = max(n * 8 * period, 60 + n * 4 * period)

	 *

	 * where n = 1 for forward-direction HS mode and n = 4 for reverse-

	 * direction HS mode. There's only one setting and this function does

	 * not parameterize on anything other that period, so this code will

	 * assumes that reverse-direction HS mode is supported and uses n = 4.

	 */

	timing->hstrail = max(4 * 8 * period, 60 + 4 * 4 * period);

	timing->init = 100000;

	timing->lpx = 60;

	timing->taget = 5 * timing->lpx;

}

/*

 * Validate D-PHY timing according to MIPI Alliance Specification for D-PHY,

 * Section 5.9 "Global Operation Timing Parameters".

 * Validate D-PHY timing according to MIPI D-PHY specification (v1.2, Section

 * Section 6.9 "Global Operation Timing Parameters").

 */

int mipi_dphy_timing_validate(struct mipi_dphy_timing *timing,

			      unsigned long period)