On 04/08/2023 13:44, Tomi Valkeinen wrote:
> The driver has a few places where it does:
>
> if (thing_is_enabled_in_config)
> update_thing_bit_in_hw()
>
> This means that if the thing is _not_ enabled, the bit never gets
> cleared. This affects the h/vsyncs and continuous DSI clock bits.
I guess the idea was to keep the reset value unless it needs to be flipped.
>
> Fix the driver to always update the bit.
>
> Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver")
> Signed-off-by: Tomi Valkeinen <tomi.valkei...@ideasonboard.com>
> ---
> drivers/gpu/drm/bridge/tc358768.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358768.c
> b/drivers/gpu/drm/bridge/tc358768.c
> index bc97a837955b..b668f77673c3 100644
> --- a/drivers/gpu/drm/bridge/tc358768.c
> +++ b/drivers/gpu/drm/bridge/tc358768.c
> @@ -794,8 +794,8 @@ static void tc358768_bridge_pre_enable(struct drm_bridge
> *bridge)
> val |= BIT(i + 1);
> tc358768_write(priv, TC358768_HSTXVREGEN, val);
>
> - if (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
> - tc358768_write(priv, TC358768_TXOPTIONCNTRL, 0x1);
> + tc358768_write(priv, TC358768_TXOPTIONCNTRL,
> + (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) ? 0 :
> BIT(0));
>
> /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
> val = tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk * 4);
> @@ -861,11 +861,12 @@ static void tc358768_bridge_pre_enable(struct
> drm_bridge *bridge)
> tc358768_write(priv, TC358768_DSI_HACT, hact);
>
> /* VSYNC polarity */
> - if (!(mode->flags & DRM_MODE_FLAG_NVSYNC))
> - tc358768_update_bits(priv, TC358768_CONFCTL, BIT(5), BIT(5));
> + tc358768_update_bits(priv, TC358768_CONFCTL, BIT(5),
> + (mode->flags & DRM_MODE_FLAG_PVSYNC) ? BIT(5) : 0);
Was this the reverse before and should be:
(mode->flags & DRM_MODE_FLAG_PVSYNC) ? 0 : BIT(5)
> +
> /* HSYNC polarity */
> - if (mode->flags & DRM_MODE_FLAG_PHSYNC)
> - tc358768_update_bits(priv, TC358768_PP_MISC, BIT(0), BIT(0));
> + tc358768_update_bits(priv, TC358768_PP_MISC, BIT(0),
> + (mode->flags & DRM_MODE_FLAG_PHSYNC) ? BIT(0) : 0);
>
> /* Start DSI Tx */
> tc358768_write(priv, TC358768_DSI_START, 0x1);
>
--
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