From: Sowjanya Komatineni <skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> To: skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, frankc-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org, sakari.ailus-X3B1VOXEql0@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, helen.koike-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org Cc: digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, sboyd-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Subject: [RFC PATCH v3 17/18] media: tegra-video: Add CSI MIPI pads calibration Date: Tue, 14 Jul 2020 21:20:54 -0700 [thread overview] Message-ID: <1594786855-26506-18-git-send-email-skomatineni@nvidia.com> (raw) In-Reply-To: <1594786855-26506-1-git-send-email-skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> CSI MIPI pads need to be enabled and calibrated for capturing from the external sensor or transmitter. MIPI CAL unit calibrates MIPI pads pull-up, pull-down and termination impedances. Calibration is done by co-work of MIPI BIAS pad and MIPI CAL control unit. Triggering calibration start can happen any time after MIPI pads are enabled but calibration results will be latched and applied to MIPI pads by MIPI CAL unit only when the link is in LP11 state and then calibration status register gets updated. This patch enables CSI MIPI pads and calibrates them during streaming. Tegra CSI receiver is able to catch the very first clock transition. So, CSI receiver is always enabled prior to sensor streaming and trigger of calibration start is done during CSI subdev streaming and status of calibration is verified after sensor stream on. Signed-off-by: Sowjanya Komatineni <skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> --- drivers/staging/media/tegra-video/csi.c | 44 +++++++++++++++++++++++++++++++-- drivers/staging/media/tegra-video/csi.h | 2 ++ drivers/staging/media/tegra-video/vi.c | 16 ++++++++++++ 3 files changed, 60 insertions(+), 2 deletions(-) diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c index c21dd09..75c844d 100644 --- a/drivers/staging/media/tegra-video/csi.c +++ b/drivers/staging/media/tegra-video/csi.c @@ -252,15 +252,42 @@ static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable) return ret; } + if (csi_chan->mipi) { + ret = tegra_mipi_enable(csi_chan->mipi); + if (ret < 0) { + dev_err(csi->dev, + "failed to enable MIPI pads: %d\n", + ret); + goto rpm_put; + } + + /* + * CSI MIPI pads PULLUP, PULLDN and TERM impedances + * need to be calibrated after power on. + * So, trigger the calibration start here and results + * will be latched and applied to the pads when link is + * in LP11 state during start of sensor streaming. + */ + tegra_mipi_calibrate(csi_chan->mipi); + } + ret = csi->ops->csi_start_streaming(csi_chan); if (ret < 0) - goto rpm_put; + goto disable_mipi; return 0; } csi->ops->csi_stop_streaming(csi_chan); +disable_mipi: + if (csi_chan->mipi) { + ret = tegra_mipi_disable(csi_chan->mipi); + if (ret < 0) + dev_err(csi->dev, + "failed to disable MIPI pads: %d\n", ret); + } + rpm_put: pm_runtime_put(csi->dev); return ret; @@ -294,6 +321,7 @@ static int tegra_csi_channel_alloc(struct tegra_csi *csi, unsigned int num_pads) { struct tegra_csi_channel *chan; + int ret = 0; chan = kzalloc(sizeof(*chan), GFP_KERNEL); if (!chan) @@ -312,7 +340,16 @@ static int tegra_csi_channel_alloc(struct tegra_csi *csi, chan->pads[0].flags = MEDIA_PAD_FL_SOURCE; } - return 0; + if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) + return 0; + + chan->mipi = tegra_mipi_request(csi->dev, node); + if (IS_ERR(chan->mipi)) { + ret = PTR_ERR(chan->mipi); + dev_err(csi->dev, "failed to get mipi device: %d\n", ret); + } + + return ret; } static int tegra_csi_tpg_channels_alloc(struct tegra_csi *csi) @@ -475,6 +512,9 @@ static void tegra_csi_channels_cleanup(struct tegra_csi *csi) struct tegra_csi_channel *chan, *tmp; list_for_each_entry_safe(chan, tmp, &csi->csi_chans, list) { + if (chan->mipi) + tegra_mipi_free(chan->mipi); + subdev = &chan->subdev; if (subdev->dev) { if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) diff --git a/drivers/staging/media/tegra-video/csi.h b/drivers/staging/media/tegra-video/csi.h index 78a5110..0d50fc3 100644 --- a/drivers/staging/media/tegra-video/csi.h +++ b/drivers/staging/media/tegra-video/csi.h @@ -50,6 +50,7 @@ struct tegra_csi; * @framerate: active framerate for TPG * @h_blank: horizontal blanking for TPG active format * @v_blank: vertical blanking for TPG active format + * @mipi: mipi device for corresponding csi channel pads */ struct tegra_csi_channel { struct list_head list; @@ -65,6 +66,7 @@ struct tegra_csi_channel { unsigned int framerate; unsigned int h_blank; unsigned int v_blank; + struct tegra_mipi_device *mipi; }; /** diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c index 676e24e2..58ad992 100644 --- a/drivers/staging/media/tegra-video/vi.c +++ b/drivers/staging/media/tegra-video/vi.c @@ -191,6 +191,7 @@ tegra_channel_get_remote_source_subdev(struct tegra_vi_channel *chan) int tegra_channel_set_stream(struct tegra_vi_channel *chan, bool on) { struct v4l2_subdev *subdev, *csi_subdev, *src_subdev; + struct tegra_csi_channel *csi_chan; int ret; csi_subdev = tegra_channel_get_remote_csi_subdev(chan); @@ -213,6 +214,21 @@ int tegra_channel_set_stream(struct tegra_vi_channel *chan, bool on) if (ret < 0 && ret != -ENOIOCTLCMD) return ret; + /* + * CSI subdev stream-on triggers start of MIPI pads calibration. + * Calibration results are latched and applied to the pads when + * link is in LP11 state which will happen during sensor stream-on. + * So, wait for pads calibration to complete here. + */ + csi_chan = v4l2_get_subdevdata(csi_subdev); + if (on && csi_chan->mipi) { + ret = tegra_mipi_wait(csi_chan->mipi); + if (ret < 0) + dev_err(csi_chan->csi->dev, + "MIPI calibration failed: %d\n", ret); + return ret; + } + return 0; } -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Sowjanya Komatineni <skomatineni@nvidia.com> To: <skomatineni@nvidia.com>, <thierry.reding@gmail.com>, <jonathanh@nvidia.com>, <frankc@nvidia.com>, <hverkuil@xs4all.nl>, <sakari.ailus@iki.fi>, <robh+dt@kernel.org>, <helen.koike@collabora.com> Cc: <digetx@gmail.com>, <sboyd@kernel.org>, <gregkh@linuxfoundation.org>, <linux-media@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-i2c@vger.kernel.org> Subject: [RFC PATCH v3 17/18] media: tegra-video: Add CSI MIPI pads calibration Date: Tue, 14 Jul 2020 21:20:54 -0700 [thread overview] Message-ID: <1594786855-26506-18-git-send-email-skomatineni@nvidia.com> (raw) In-Reply-To: <1594786855-26506-1-git-send-email-skomatineni@nvidia.com> CSI MIPI pads need to be enabled and calibrated for capturing from the external sensor or transmitter. MIPI CAL unit calibrates MIPI pads pull-up, pull-down and termination impedances. Calibration is done by co-work of MIPI BIAS pad and MIPI CAL control unit. Triggering calibration start can happen any time after MIPI pads are enabled but calibration results will be latched and applied to MIPI pads by MIPI CAL unit only when the link is in LP11 state and then calibration status register gets updated. This patch enables CSI MIPI pads and calibrates them during streaming. Tegra CSI receiver is able to catch the very first clock transition. So, CSI receiver is always enabled prior to sensor streaming and trigger of calibration start is done during CSI subdev streaming and status of calibration is verified after sensor stream on. Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com> --- drivers/staging/media/tegra-video/csi.c | 44 +++++++++++++++++++++++++++++++-- drivers/staging/media/tegra-video/csi.h | 2 ++ drivers/staging/media/tegra-video/vi.c | 16 ++++++++++++ 3 files changed, 60 insertions(+), 2 deletions(-) diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c index c21dd09..75c844d 100644 --- a/drivers/staging/media/tegra-video/csi.c +++ b/drivers/staging/media/tegra-video/csi.c @@ -252,15 +252,42 @@ static int tegra_csi_s_stream(struct v4l2_subdev *subdev, int enable) return ret; } + if (csi_chan->mipi) { + ret = tegra_mipi_enable(csi_chan->mipi); + if (ret < 0) { + dev_err(csi->dev, + "failed to enable MIPI pads: %d\n", + ret); + goto rpm_put; + } + + /* + * CSI MIPI pads PULLUP, PULLDN and TERM impedances + * need to be calibrated after power on. + * So, trigger the calibration start here and results + * will be latched and applied to the pads when link is + * in LP11 state during start of sensor streaming. + */ + tegra_mipi_calibrate(csi_chan->mipi); + } + ret = csi->ops->csi_start_streaming(csi_chan); if (ret < 0) - goto rpm_put; + goto disable_mipi; return 0; } csi->ops->csi_stop_streaming(csi_chan); +disable_mipi: + if (csi_chan->mipi) { + ret = tegra_mipi_disable(csi_chan->mipi); + if (ret < 0) + dev_err(csi->dev, + "failed to disable MIPI pads: %d\n", ret); + } + rpm_put: pm_runtime_put(csi->dev); return ret; @@ -294,6 +321,7 @@ static int tegra_csi_channel_alloc(struct tegra_csi *csi, unsigned int num_pads) { struct tegra_csi_channel *chan; + int ret = 0; chan = kzalloc(sizeof(*chan), GFP_KERNEL); if (!chan) @@ -312,7 +340,16 @@ static int tegra_csi_channel_alloc(struct tegra_csi *csi, chan->pads[0].flags = MEDIA_PAD_FL_SOURCE; } - return 0; + if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) + return 0; + + chan->mipi = tegra_mipi_request(csi->dev, node); + if (IS_ERR(chan->mipi)) { + ret = PTR_ERR(chan->mipi); + dev_err(csi->dev, "failed to get mipi device: %d\n", ret); + } + + return ret; } static int tegra_csi_tpg_channels_alloc(struct tegra_csi *csi) @@ -475,6 +512,9 @@ static void tegra_csi_channels_cleanup(struct tegra_csi *csi) struct tegra_csi_channel *chan, *tmp; list_for_each_entry_safe(chan, tmp, &csi->csi_chans, list) { + if (chan->mipi) + tegra_mipi_free(chan->mipi); + subdev = &chan->subdev; if (subdev->dev) { if (!IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG)) diff --git a/drivers/staging/media/tegra-video/csi.h b/drivers/staging/media/tegra-video/csi.h index 78a5110..0d50fc3 100644 --- a/drivers/staging/media/tegra-video/csi.h +++ b/drivers/staging/media/tegra-video/csi.h @@ -50,6 +50,7 @@ struct tegra_csi; * @framerate: active framerate for TPG * @h_blank: horizontal blanking for TPG active format * @v_blank: vertical blanking for TPG active format + * @mipi: mipi device for corresponding csi channel pads */ struct tegra_csi_channel { struct list_head list; @@ -65,6 +66,7 @@ struct tegra_csi_channel { unsigned int framerate; unsigned int h_blank; unsigned int v_blank; + struct tegra_mipi_device *mipi; }; /** diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c index 676e24e2..58ad992 100644 --- a/drivers/staging/media/tegra-video/vi.c +++ b/drivers/staging/media/tegra-video/vi.c @@ -191,6 +191,7 @@ tegra_channel_get_remote_source_subdev(struct tegra_vi_channel *chan) int tegra_channel_set_stream(struct tegra_vi_channel *chan, bool on) { struct v4l2_subdev *subdev, *csi_subdev, *src_subdev; + struct tegra_csi_channel *csi_chan; int ret; csi_subdev = tegra_channel_get_remote_csi_subdev(chan); @@ -213,6 +214,21 @@ int tegra_channel_set_stream(struct tegra_vi_channel *chan, bool on) if (ret < 0 && ret != -ENOIOCTLCMD) return ret; + /* + * CSI subdev stream-on triggers start of MIPI pads calibration. + * Calibration results are latched and applied to the pads when + * link is in LP11 state which will happen during sensor stream-on. + * So, wait for pads calibration to complete here. + */ + csi_chan = v4l2_get_subdevdata(csi_subdev); + if (on && csi_chan->mipi) { + ret = tegra_mipi_wait(csi_chan->mipi); + if (ret < 0) + dev_err(csi_chan->csi->dev, + "MIPI calibration failed: %d\n", ret); + return ret; + } + return 0; } -- 2.7.4
next prev parent reply other threads:[~2020-07-15 4:20 UTC|newest] Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-15 4:20 [RFC PATCH v3 00/18] Support for Tegra video capture from external sensor Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 02/18] arm64: tegra: Add missing clocks and power-domains to Tegra210 VI I2C Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni [not found] ` <1594786855-26506-3-git-send-email-skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-16 13:25 ` Thierry Reding 2020-07-16 13:25 ` Thierry Reding 2020-07-15 4:20 ` [RFC PATCH v3 04/18] i2c: tegra: Remove NULL pointer check before clk_enable/disable/prepare/unprepare Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-16 20:25 ` Dmitry Osipenko 2020-07-15 4:20 ` [RFC PATCH v3 05/18] i2c: tegra: Fix the error path in tegra_i2c_runtime_resume Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 07/18] i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 09/18] media: tegra-video: Enable TPG based on kernel config Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 12/18] media: tegra-video: Add support for external sensor capture Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 13/18] media: tegra-video: Add support for selection ioctl ops Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 14/18] gpu: host1x: mipi: Update tegra_mipi_request() to be node based Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni [not found] ` <1594786855-26506-15-git-send-email-skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-16 20:26 ` Dmitry Osipenko 2020-07-16 20:26 ` Dmitry Osipenko 2020-07-15 4:20 ` [RFC PATCH v3 15/18] gpu: host1x: mipi: Use readl_relaxed_poll_timeout in tegra_mipi_wait Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 16/18] gpu: host1x: mipi: Split tegra_mipi_calibrate and tegra_mipi_wait Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni [not found] ` <1594786855-26506-17-git-send-email-skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-16 20:38 ` Dmitry Osipenko 2020-07-16 20:38 ` Dmitry Osipenko [not found] ` <a06dec8f-7042-767b-545b-048685a7683d-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2020-07-16 21:09 ` Sowjanya Komatineni 2020-07-16 21:09 ` Sowjanya Komatineni [not found] ` <20d63eca-4b2b-584e-a391-a4fb64a16b40-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-16 21:18 ` Dmitry Osipenko 2020-07-16 21:18 ` Dmitry Osipenko 2020-07-16 22:49 ` Sowjanya Komatineni 2020-07-16 22:49 ` Sowjanya Komatineni 2020-07-16 23:01 ` Dmitry Osipenko 2020-07-16 23:06 ` Sowjanya Komatineni 2020-07-16 23:06 ` Sowjanya Komatineni [not found] ` <4690e682-8495-2327-87c7-c2f06a7a479d-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-16 23:09 ` Sowjanya Komatineni 2020-07-16 23:09 ` Sowjanya Komatineni [not found] ` <66812127-38cf-2af3-51c0-50edbe446e73-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-16 23:47 ` Dmitry Osipenko 2020-07-16 23:47 ` Dmitry Osipenko 2020-07-17 0:16 ` Sowjanya Komatineni 2020-07-17 0:16 ` Sowjanya Komatineni [not found] ` <550f1796-67ca-5856-223d-c68360243954-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-17 4:46 ` Sowjanya Komatineni 2020-07-17 4:46 ` Sowjanya Komatineni 2020-07-17 15:01 ` Dmitry Osipenko [not found] ` <080b30c7-1dce-dd2f-dd96-40f6e25da4d6-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2020-07-17 15:41 ` Sowjanya Komatineni 2020-07-17 15:41 ` Sowjanya Komatineni [not found] ` <b125deab-7900-6266-d405-4d7f029089b4-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-17 20:14 ` Dmitry Osipenko 2020-07-17 20:14 ` Dmitry Osipenko [not found] ` <1594786855-26506-1-git-send-email-skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-15 4:20 ` [RFC PATCH v3 01/18] dt-bindings: i2c: tegra: Document Tegra210 VI I2C clocks and power-domains Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni [not found] ` <1594786855-26506-2-git-send-email-skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-16 13:25 ` Thierry Reding 2020-07-16 13:25 ` Thierry Reding 2020-07-15 4:20 ` [RFC PATCH v3 03/18] i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 06/18] i2c: tegra: Fix runtime resume to re-init VI I2C Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 08/18] media: tegra-video: Fix channel format alignment Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 10/18] media: tegra-video: Update format lookup to offset based Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 11/18] dt-bindings: tegra: Update VI and CSI bindings with port info Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni [not found] ` <1594786855-26506-12-git-send-email-skomatineni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-16 19:09 ` Rob Herring 2020-07-16 19:09 ` Rob Herring 2020-07-15 4:20 ` Sowjanya Komatineni [this message] 2020-07-15 4:20 ` [RFC PATCH v3 17/18] media: tegra-video: Add CSI MIPI pads calibration Sowjanya Komatineni 2020-07-15 4:20 ` [RFC PATCH v3 18/18] media: tegra-video: Compute settle times based on the clock rate Sowjanya Komatineni 2020-07-15 4:20 ` Sowjanya Komatineni 2020-07-17 10:54 ` [RFC PATCH v3 00/18] Support for Tegra video capture from external sensor Hans Verkuil 2020-07-17 10:54 ` Hans Verkuil [not found] ` <f03bdb89-df7c-e9e8-1512-d57e5d2332bf-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org> 2020-07-17 16:34 ` Sowjanya Komatineni 2020-07-17 16:34 ` Sowjanya Komatineni 2020-07-17 17:08 ` Hans Verkuil 2020-07-17 17:23 ` Sowjanya Komatineni 2020-07-17 17:23 ` Sowjanya Komatineni [not found] ` <5694f74a-be8e-7a95-1739-0a5fc9820597-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-17 17:38 ` Sowjanya Komatineni 2020-07-17 17:38 ` Sowjanya Komatineni [not found] ` <9aa8be89-d181-2dca-36ca-ea118bd5b0a7-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-17 17:48 ` Sowjanya Komatineni 2020-07-17 17:48 ` Sowjanya Komatineni [not found] ` <2f9ecba7-3d05-8a68-f2ad-546470780642-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2020-07-20 4:41 ` Sowjanya Komatineni 2020-07-20 4:41 ` Sowjanya Komatineni
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