drm/bridge: tc358768: Disable non-continuous clock mode

Non-continuous clock mode doesn't work because driver doesn't support it
properly. The bridge driver programs wrong bitfields that are required by
the non-continuous mode (BTACNTRL1 register bitfields are swapped in the
code), but fixing them doesn't help.

Display panel of ASUS Transformer TF700T tablet supports non-continuous
mode and display doesn't work at all using that mode. There are no
device-trees that are actively using this DSI bridge in upstream yet,
so clearly the broken mode wasn't ever tested properly. It's a bit too
difficult to get LP mode working, hence let's disable the offending mode
for now and fall back to continuous mode.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # Asus TF700T
Tested-by: Maxim Schwalm <maxim.schwalm@gmail.com> #TF700T
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211002233447.1105-5-digetx@gmail.com

diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index 5b3f872..cfceba5 100644 (file)
--- a/drivers/gpu/drm/bridge/tc358768.c
+++ b/drivers/gpu/drm/bridge/tc358768.c
@@ -631,6 +631,7 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
 {
        struct tc358768_priv *priv = bridge_to_tc358768(bridge);
        struct mipi_dsi_device *dsi_dev = priv->output.dev;
+       unsigned long mode_flags = dsi_dev->mode_flags;
        u32 val, val2, lptxcnt, hact, data_type;
        const struct drm_display_mode *mode;
        u32 dsibclk_nsk, dsiclk_nsk, ui_nsk, phy_delay_nsk;
@@ -638,6 +639,11 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
        const u32 internal_delay = 40;
        int ret, i;
 
+       if (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
+               dev_warn_once(priv->dev, "Non-continuous mode unimplemented, falling back to continuous\n");
+               mode_flags &= ~MIPI_DSI_CLOCK_NON_CONTINUOUS;
+       }
+
        tc358768_hw_enable(priv);
 
        ret = tc358768_sw_reset(priv);
@@ -776,7 +782,7 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
                val |= BIT(i + 1);
        tc358768_write(priv, TC358768_HSTXVREGEN, val);
 
-       if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
+       if (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
                tc358768_write(priv, TC358768_TXOPTIONCNTRL, 0x1);
 
        /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
@@ -864,7 +870,7 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
        if (!(dsi_dev->mode_flags & MIPI_DSI_MODE_LPM))
                val |= TC358768_DSI_CONTROL_TXMD;
 
-       if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
+       if (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
                val |= TC358768_DSI_CONTROL_HSCKMD;
 
        if (dsi_dev->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET)