Patch "drm/bridge: tc358768: Fix bit updates" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/bridge: tc358768: Fix bit updates

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-bridge-tc358768-fix-bit-updates.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 00150d541081d8aaf31b41843a0c382314e761d2
Author: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Date:   Wed Sep 6 09:50:51 2023 +0300

    drm/bridge: tc358768: Fix bit updates
    
    [ Upstream commit 66962d5c3c51377b9b90cae35b7e038950438e02 ]
    
    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.
    
    Fix the driver to always update the bit.
    
    Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver")
    Reviewed-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>
    Tested-by: Maxim Schwalm <maxim.schwalm@xxxxxxxxx> # Asus TF700T
    Tested-by: Marcel Ziswiler <marcel.ziswiler@xxxxxxxxxxx>
    Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
    Signed-off-by: Robert Foss <rfoss@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20230906-tc358768-v4-4-31725f008a50@xxxxxxxxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index bc97a837955ba..b668f77673c3d 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);
+
 	/* 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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