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[2001:1c00:c0c:fe00:6c10:fbf3:14c4:884c]) by smtp.gmail.com with ESMTPSA id y15sm6498668eds.56.2020.11.24.01.01.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 24 Nov 2020 01:01:03 -0800 (PST) Subject: Re: [PATCH] drm/i915/dsi: Use unconditional msleep for the panel_on_delay when there is no reset-deassert MIPI-sequence To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= References: <20201118124058.26021-1-hdegoede@redhat.com> From: Hans de Goede Message-ID: <8b8d0e94-28db-1c4d-e14c-29a9920d0f76@redhat.com> Date: Tue, 24 Nov 2020 10:01:02 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <20201118124058.26021-1-hdegoede@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=hdegoede@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx , dri-devel@lists.freedesktop.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi, On 11/18/20 1:40 PM, Hans de Goede wrote: > Commit 25b4620ee822 ("drm/i915/dsi: Skip delays for v3 VBTs in vid-mode") > added an intel_dsi_msleep() helper which skips sleeping if the > MIPI-sequences have a version of 3 or newer and the panel is in vid-mode; > and it moved a bunch of msleep-s over to this new helper. > > This was based on my reading of the big comment around line 730 which > starts with "Panel enable/disable sequences from the VBT spec.", > where the "v3 video mode seq" column does not have any wait t# entries. > > Given that this code has been used on a lot of different devices without > issues until now, it seems that my interpretation of the spec here is > mostly correct. > > But now I have encountered one device, an Acer Aspire Switch 10 E > SW3-016, where the panel will not light up unless we do actually honor the > panel_on_delay after exexuting the MIPI_SEQ_PANEL_ON sequence. > > What seems to set this model apart is that it is lacking a > MIPI_SEQ_DEASSERT_RESET sequence, which is where the power-on > delay usually happens. > > Fix the panel not lighting up on this model by using an unconditional > msleep(panel_on_delay) instead of intel_dsi_msleep() when there is > no MIPI_SEQ_DEASSERT_RESET sequence. > > Fixes: 25b4620ee822 ("drm/i915/dsi: Skip delays for v3 VBTs in vid-mode") > Signed-off-by: Hans de Goede Ping can I get a review/ack for this please? Regards, Hans > --- > drivers/gpu/drm/i915/display/vlv_dsi.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c > index 194c239ab6b1..ef673277b36d 100644 > --- a/drivers/gpu/drm/i915/display/vlv_dsi.c > +++ b/drivers/gpu/drm/i915/display/vlv_dsi.c > @@ -816,10 +816,14 @@ static void intel_dsi_pre_enable(struct intel_atomic_state *state, > intel_dsi_prepare(encoder, pipe_config); > > intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_ON); > - intel_dsi_msleep(intel_dsi, intel_dsi->panel_on_delay); > > - /* Deassert reset */ > - intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET); > + if (dev_priv->vbt.dsi.sequence[MIPI_SEQ_DEASSERT_RESET]) { > + intel_dsi_msleep(intel_dsi, intel_dsi->panel_on_delay); > + /* Deassert reset */ > + intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET); > + } else { > + msleep(intel_dsi->panel_on_delay); > + } > > if (IS_GEMINILAKE(dev_priv)) { > glk_cold_boot = glk_dsi_enable_io(encoder); > _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel