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drm/tidss: Add simple K2G manual reset

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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: Aradhya Bhatia <a-bhatia1@ti.com>
Link: https://lore.kernel.org/r/20231109-tidss-probe-v2-7-ac91b5ea35c0@ideasonboard.com
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
This commit is contained in:
Tomi Valkeinen 2023-11-09 09:38:00 +02:00
parent 151825150c
commit 576d96c5c8
1 changed files with 16 additions and 2 deletions
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18
drivers/gpu/drm/tidss/tidss_dispc.c
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@ -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);