From: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
Correct computation of TXTAGOCNT register.
This register must be set to a value that ensure that the
TTA-GO period = (4 x TLPX)
with the actual value of TTA-GO being
4 x (TXTAGOCNT + 1) x (HSByteClk cycle)
Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver")
Signed-off-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
---
drivers/gpu/drm/bridge/tc358768.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index 36e33cba59a2..854fc04f08d0 100644
--- a/drivers/gpu/drm/bridge/tc358768.c
+++ b/drivers/gpu/drm/bridge/tc358768.c
@@ -795,7 +795,7 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
/* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
val = tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk * 4);
- val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 1;
+ val = tc358768_ns_to_cnt(val, dsibclk_nsk) / 4 - 1;
val2 = tc358768_ns_to_cnt(tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk),
dsibclk_nsk) - 2;
val = val << 16 | val2;
--
2.25.1
