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drm/bridge: tc358768: fix TXTAGOCNT computation

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[ Upstream commit 3666aad818 ]

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: ff1ca6397b ("drm/bridge: Add tc358768 driver")
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230427142934.55435-8-francesco@dolcini.it
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Francesco Dolcini
2023-04-27 16:29:32 +02:00
committed by Greg Kroah-Hartman
parent 8e47328fe0
commit f2f7d0a4a2
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/bridge/tc358768.c
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@ -779,7 +779,7 @@ 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 |= val2 << 16;