From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
Andrzej Hajda <a.hajda@samsung.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Robert Foss <robert.foss@linaro.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Maxim Schwalm <maxim.schwalm@gmail.com>,
Andreas Westman Dorcsak <hedmoo@yahoo.com>,
Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v1 4/5] drm/bridge: tc358768: Disable non-continuous clock mode
Date: Sun, 3 Oct 2021 02:34:46 +0300 [thread overview]
Message-ID: <20211002233447.1105-5-digetx@gmail.com> (raw)
In-Reply-To: <20211002233447.1105-1-digetx@gmail.com>
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>
---
drivers/gpu/drm/bridge/tc358768.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index 5b3f8723bd3d..cfceba5ef3b8 100644
--- 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)
--
2.32.0
next prev parent reply other threads:[~2021-10-02 23:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-02 23:34 [PATCH v1 0/5] Improvements for TC358768 DSI bridge driver Dmitry Osipenko
2021-10-02 23:34 ` [PATCH v1 1/5] drm/bridge: tc358768: Enable reference clock Dmitry Osipenko
2021-10-19 8:47 ` Robert Foss
2021-10-02 23:34 ` [PATCH v1 2/5] drm/bridge: tc358768: Support pulse mode Dmitry Osipenko
2021-10-19 8:55 ` Robert Foss
2021-10-02 23:34 ` [PATCH v1 3/5] drm/bridge: tc358768: Calculate video start delay Dmitry Osipenko
2021-10-19 9:27 ` Robert Foss
2021-10-02 23:34 ` Dmitry Osipenko [this message]
2021-10-19 9:37 ` [PATCH v1 4/5] drm/bridge: tc358768: Disable non-continuous clock mode Robert Foss
2021-10-02 23:34 ` [PATCH v1 5/5] drm/bridge: tc358768: Correct BTACNTRL1 programming Dmitry Osipenko
2021-10-19 9:38 ` Robert Foss
2021-10-19 9:47 ` [PATCH v1 0/5] Improvements for TC358768 DSI bridge driver Robert Foss
2021-10-19 20:37 ` Dmitry Osipenko
2021-12-19 16:02 ` Dmitry Osipenko
2021-12-21 18:10 ` Robert Foss
2021-12-21 18:15 ` Dmitry Osipenko
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