From: Douglas Anderson <dianders@chromium.org> To: 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@siol.net>, Sam Ravnborg <sam@ravnborg.org> Cc: Linus W <linus.walleij@linaro.org>, Bjorn Andersson <bjorn.andersson@linaro.org>, robdclark@chromium.org, Stephen Boyd <swboyd@chromium.org>, Steev Klimaszewski <steev@kali.org>, Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, linux-arm-msm@vger.kernel.org, Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>, Douglas Anderson <dianders@chromium.org>, Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>, Robert Foss <robert.foss@linaro.org>, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 09/12] drm/bridge: ti-sn65dsi86: Fail aux transfers right away if not powered Date: Fri, 2 Apr 2021 15:28:43 -0700 [thread overview] Message-ID: <20210402152701.v3.9.Ifda98514600b646db4fc7bc55f0d0f9a4f1650db@changeid> (raw) In-Reply-To: <20210402222846.2461042-1-dianders@chromium.org> If the bridge (and panel) haven't been powered on then AUX transfers just won't work. Let's just fail them instantly. Signed-off-by: Douglas Anderson <dianders@chromium.org> --- If the patch ("drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare") is accepted then we could consider actually powering the panel on instead of failing the transfer. However, without that patch the overhead would just be too much since we need to do several AUX transfers for a single EDID read and powering up and down each time would just be too much. Changes in v3: - ("Fail aux transfers right away if not powered") split out for v3. drivers/gpu/drm/bridge/ti-sn65dsi86.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 543590801a8e..a76cac93cb46 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -896,6 +896,13 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux, int ret; u8 addr_len[SN_AUX_LENGTH_REG + 1 - SN_AUX_ADDR_19_16_REG]; + /* + * Things just won't work if the panel isn't powered. Return failure + * right away. + */ + if (!pdata->pre_enabled) + return -EIO; + if (len > SN_AUX_MAX_PAYLOAD_BYTES) return -EINVAL; -- 2.31.0.208.g409f899ff0-goog
WARNING: multiple messages have this Message-ID (diff)
From: Douglas Anderson <dianders@chromium.org> To: 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@siol.net>, Sam Ravnborg <sam@ravnborg.org> Cc: robdclark@chromium.org, dri-devel@lists.freedesktop.org, David Airlie <airlied@linux.ie>, linux-arm-msm@vger.kernel.org, Douglas Anderson <dianders@chromium.org>, Steev Klimaszewski <steev@kali.org>, Stephen Boyd <swboyd@chromium.org>, Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>, Robert Foss <robert.foss@linaro.org>, Bjorn Andersson <bjorn.andersson@linaro.org>, linux-kernel@vger.kernel.org Subject: [PATCH v3 09/12] drm/bridge: ti-sn65dsi86: Fail aux transfers right away if not powered Date: Fri, 2 Apr 2021 15:28:43 -0700 [thread overview] Message-ID: <20210402152701.v3.9.Ifda98514600b646db4fc7bc55f0d0f9a4f1650db@changeid> (raw) In-Reply-To: <20210402222846.2461042-1-dianders@chromium.org> If the bridge (and panel) haven't been powered on then AUX transfers just won't work. Let's just fail them instantly. Signed-off-by: Douglas Anderson <dianders@chromium.org> --- If the patch ("drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare") is accepted then we could consider actually powering the panel on instead of failing the transfer. However, without that patch the overhead would just be too much since we need to do several AUX transfers for a single EDID read and powering up and down each time would just be too much. Changes in v3: - ("Fail aux transfers right away if not powered") split out for v3. drivers/gpu/drm/bridge/ti-sn65dsi86.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 543590801a8e..a76cac93cb46 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -896,6 +896,13 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux, int ret; u8 addr_len[SN_AUX_LENGTH_REG + 1 - SN_AUX_ADDR_19_16_REG]; + /* + * Things just won't work if the panel isn't powered. Return failure + * right away. + */ + if (!pdata->pre_enabled) + return -EIO; + if (len > SN_AUX_MAX_PAYLOAD_BYTES) return -EINVAL; -- 2.31.0.208.g409f899ff0-goog _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2021-04-02 22:29 UTC|newest] Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-02 22:28 [PATCH v3 00/12] drm: Fix EDID reading on ti-sn65dsi86 Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-02 22:28 ` [PATCH v3 01/12] drm/bridge: Fix the stop condition of drm_bridge_chain_pre_enable() Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:49 ` Laurent Pinchart 2021-04-05 0:49 ` Laurent Pinchart 2021-04-15 1:19 ` Doug Anderson 2021-04-15 1:19 ` Doug Anderson 2021-04-15 1:56 ` Laurent Pinchart 2021-04-15 1:56 ` Laurent Pinchart 2021-04-15 14:48 ` Doug Anderson 2021-04-15 14:48 ` Doug Anderson 2021-04-02 22:28 ` [PATCH v3 02/12] drm/bridge: ti-sn65dsi86: Simplify refclk handling Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-02 22:28 ` [PATCH v3 03/12] drm/bridge: ti-sn65dsi86: Remove incorrectly tagged kerneldoc comment Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:50 ` Laurent Pinchart 2021-04-05 0:50 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 04/12] drm/bridge: ti-sn65dsi86: Reorder remove() Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:52 ` Laurent Pinchart 2021-04-05 0:52 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 05/12] drm/bridge: ti-sn65dsi86: Move drm_panel_unprepare() to post_disable() Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:58 ` Laurent Pinchart 2021-04-05 0:58 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 06/12] drm/bridge: ti-sn65dsi86: Get rid of the useless detect() function Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 0:58 ` Laurent Pinchart 2021-04-05 0:58 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 07/12] drm/bridge: ti-sn65dsi86: Remove extra call: drm_connector_update_edid_property() Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 1:01 ` Laurent Pinchart 2021-04-05 1:01 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 08/12] drm/bridge: ti-sn65dsi86: Power things properly for reading the EDID Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson [this message] 2021-04-02 22:28 ` [PATCH v3 09/12] drm/bridge: ti-sn65dsi86: Fail aux transfers right away if not powered Douglas Anderson 2021-04-02 22:28 ` [PATCH v3 10/12] drm/bridge: ti-sn65dsi86: Read the EDID only if refclk was provided Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 1:04 ` Laurent Pinchart 2021-04-05 1:04 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 11/12] drm/bridge: ti-sn65dsi86: Print an error if we fallback to panel modes Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-05 1:04 ` Laurent Pinchart 2021-04-05 1:04 ` Laurent Pinchart 2021-04-02 22:28 ` [PATCH v3 12/12] drm/panel: panel-simple: Use runtime pm to avoid excessive unprepare / prepare Douglas Anderson 2021-04-02 22:28 ` Douglas Anderson 2021-04-15 0:58 ` Laurent Pinchart 2021-04-15 0:58 ` Laurent Pinchart 2021-04-15 1:22 ` Doug Anderson 2021-04-15 1:22 ` Doug Anderson 2021-04-15 1:30 ` Laurent Pinchart 2021-04-15 1:30 ` Laurent Pinchart
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