The AM625 DSS IP contains 2 OLDI TXes which can work together to enable 2
cloned displays of or even a single dual-link display with higher
resolutions like WUXGA (1920x1200@60fps) with a reduced OLDI clock
frequency.
Configure the necessary register to enable and disable the OLDI TXes
with required modes configurations.
Signed-off-by: Aradhya Bhatia <a-bhatia1@xxxxxx>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/tidss/tidss_dispc.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index 0e03557bc142..79ad9743a93b 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -1020,8 +1020,8 @@ static void dispc_enable_oldi(struct dispc_device *dispc, u32 hw_videoport,
int count = 0;
/*
- * For the moment DUALMODESYNC, MASTERSLAVE, MODE, and SRC
- * bits of DISPC_VP_DSS_OLDI_CFG are set statically to 0.
+ * For the moment MASTERSLAVE, and SRC bits of DISPC_VP_DSS_OLDI_CFG are
+ * always set to 0.
*/
if (fmt->data_width == 24)
@@ -1038,6 +1038,26 @@ static void dispc_enable_oldi(struct dispc_device *dispc, u32 hw_videoport,
oldi_cfg |= BIT(0); /* ENABLE */
+ switch (dispc->oldi_mode) {
+ case OLDI_MODE_SINGLE_LINK:
+ /* All configuration is done for this mode. */
+ break;
+
+ case OLDI_MODE_CLONE_SINGLE_LINK:
+ oldi_cfg |= BIT(5); /* CLONE MODE */
+ break;
+
+ case OLDI_MODE_DUAL_LINK:
+ oldi_cfg |= BIT(11); /* DUALMODESYNC */
+ oldi_cfg |= BIT(3); /* data-mapping field also indicates dual-link mode */
+ break;
+
+ default:
+ dev_warn(dispc->dev, "%s: Incorrect oldi mode. Returning.\n",
+ __func__);
+ return;
+ }
+
dispc_vp_write(dispc, hw_videoport, DISPC_VP_DSS_OLDI_CFG, oldi_cfg);
while (!(oldi_reset_bit & dispc_read(dispc, DSS_SYSSTATUS)) &&
--
2.39.0
