From: Robert Foss <robert.foss@linaro.org>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>,
Andrzej Hajda <a.hajda@samsung.com>,
Neil Armstrong <narmstrong@baylibre.com>,
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>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
dri-devel <dri-devel@lists.freedesktop.org>,
linux-tegra@vger.kernel.org,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v1 4/5] drm/bridge: tc358768: Disable non-continuous clock mode
Date: Tue, 19 Oct 2021 11:37:06 +0200 [thread overview]
Message-ID: <CAG3jFyt2NVWyGRWj3QPKhrYgcaRZ+QVifNEHA9CvY0XwnnLvRA@mail.gmail.com> (raw)
In-Reply-To: <20211002233447.1105-5-digetx@gmail.com>
On Sun, 3 Oct 2021 at 01:35, Dmitry Osipenko <digetx@gmail.com> wrote:
>
> 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)
> --
Reviewed-by: Robert Foss <robert.foss@linaro.org>
next prev parent reply other threads:[~2021-10-19 9:37 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 ` [PATCH v1 4/5] drm/bridge: tc358768: Disable non-continuous clock mode Dmitry Osipenko
2021-10-19 9:37 ` Robert Foss [this message]
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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