Commit 576d96c5 authored by Tomi Valkeinen's avatar Tomi Valkeinen
Browse files

drm/tidss: Add simple K2G manual reset 



K2G display controller does not support soft reset, but we can do the
most important steps manually: mask the IRQs and disable the VPs.

Reviewed-by: default avatarAradhya Bhatia <a-bhatia1@ti.com>
Link: https://lore.kernel.org/r/20231109-tidss-probe-v2-7-ac91b5ea35c0@ideasonboard.com


Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ideasonboard.com>
parent 15182515

drivers/gpu/drm/tidss/tidss_dispc.c

+16 −2
Original line number Diff line number Diff line
@@ -2761,14 +2761,28 @@ static void dispc_init_errata(struct dispc_device *dispc) 
	}

}



/*

 * K2G display controller does not support soft reset, so we do a basic manual

 * reset here: make sure the IRQs are masked and VPs are disabled.

 */

static void dispc_softreset_k2g(struct dispc_device *dispc)

{

	dispc_set_irqenable(dispc, 0);

	dispc_read_and_clear_irqstatus(dispc);



	for (unsigned int vp_idx = 0; vp_idx < dispc->feat->num_vps; ++vp_idx)

		VP_REG_FLD_MOD(dispc, vp_idx, DISPC_VP_CONTROL, 0, 0, 0);

}



static int dispc_softreset(struct dispc_device *dispc)

{

	u32 val;

	int ret;



	/* K2G display controller does not support soft reset */

	if (dispc->feat->subrev == DISPC_K2G)

	if (dispc->feat->subrev == DISPC_K2G) {

		dispc_softreset_k2g(dispc);

		return 0;

	}



	/* Soft reset */

	REG_FLD_MOD(dispc, DSS_SYSCONFIG, 1, 1, 1);