diff options
| author | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2023-11-09 10:38:00 +0300 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2023-12-01 13:04:42 +0300 |
| commit | 576d96c5c896221b5bc8feae473739469a92e144 (patch) | |
| tree | 4eb1788cfce04aab79f7011b0489aeb3b3055403 | |
| parent | 151825150cf9c2e9fb90763d35b9dff3783628ac (diff) | |
| download | linux-576d96c5c896221b5bc8feae473739469a92e144.tar.xz | |
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: 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>
| -rw-r--r-- | drivers/gpu/drm/tidss/tidss_dispc.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c index f9de26cd241a..c3741feaafff 100644 --- a/drivers/gpu/drm/tidss/tidss_dispc.c +++ b/drivers/gpu/drm/tidss/tidss_dispc.c @@ -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); |