kernel/drivers/gpu/host1x/mipi.c, branch linux-6.9.y

gpu: host1x: mipi: Use devm_platform_get_and_ioremap_resource()

2023-04-04T12:24:24Z

Convert platform_get_resource(), devm_ioremap_resource() to a single call to devm_platform_get_and_ioremap_resource(), as this is exactly what this function does. Signed-off-by: Ye Xingchen Signed-off-by: Thierry Reding

media: gpu: host1x: mipi: Keep MIPI clock enabled and mutex locked till calibration done

2020-08-28T13:12:38Z

With the split of MIPI calibration into tegra_mipi_calibrate() and tegra_mipi_wait(), MIPI clock is not kept enabled and mutex is not locked till the calibration is done. So, this patch keeps MIPI clock enabled and mutex locked after triggering start of calibration till its done. To let calibration process go through its finite sequence codes before calibration logic waiting for pads idle state added wait time of 75usec to make sure it sees idle state to apply the results. This patch renames tegra_mipi_calibrate() as tegra_mipi_start_calibration() and tegra_mipi_wait() as tegra_mipi_finish_calibration() to be inline with their usage. Reviewed-by: Dmitry Osipenko Signed-off-by: Sowjanya Komatineni Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab

gpu: host1x: mipi: Split tegra_mipi_calibrate() and tegra_mipi_wait()

2020-07-17T14:06:14Z

SW can trigger MIPI pads calibration any time after power on but calibration results will be latched and applied to the pads by MIPI CAL unit only when the link is in LP-11 state and then status register will be updated. For CSI, trigger of pads calibration happen during CSI stream enable where CSI receiver is kept ready prior to sensor or CSI transmitter stream start. So, pads may not be in LP-11 at this time and waiting for the calibration to be done immediate after calibration start will result in timeout. This patch splits tegra_mipi_calibrate() and tegra_mipi_wait() so triggering for calibration and waiting for it to complete can happen at different stages. Signed-off-by: Sowjanya Komatineni Signed-off-by: Thierry Reding

gpu: host1x: mipi: Use readl_relaxed_poll_timeout() in tegra_mipi_wait()

2020-07-17T14:06:13Z

Use readl_relaxed_poll_timeout() in tegra_mipi_wait() to simplify the code. Signed-off-by: Sowjanya Komatineni Signed-off-by: Thierry Reding

gpu: host1x: mipi: Update tegra_mipi_request() to be node based

2020-07-17T14:06:13Z

Tegra CSI driver need a separate MIPI device for each channel as calibration of corresponding MIPI pads for each channel should happen independently. So, this patch updates tegra_mipi_request() API to add a device_node pointer argument to allow creating mipi device for specific device node rather than a device. Signed-off-by: Sowjanya Komatineni Signed-off-by: Thierry Reding

drm/tegra: dsi: Enhance runtime power management

2016-08-24T13:58:57Z

The MIPI DSI output on Tegra SoCs requires some external logic to calibrate the MIPI pads before a video signal can be transmitted. This MIPI calibration logic requires to be powered on while the MIPI pads are being used, which is currently done as part of the DSI driver's probe implementation. This is suboptimal because it will leave the MIPI calibration logic powered up even if the DSI output is never used. On Tegra114 and earlier this behaviour also causes the driver to hang while trying to power up the MIPI calibration logic because the power partition that contains the MIPI calibration logic will be powered on by the display controller at output pipeline configuration time. Thus the power up sequence for the MIPI calibration logic happens before it's power partition is guaranteed to be enabled. Fix this by splitting up the API into a request/free pair of functions that manage the runtime dependency between the DSI and the calibration modules (no registers are accessed) and a set of enable, calibrate and disable functions that program the MIPI calibration logic at points in time where the power partition is really enabled. While at it, make sure that the runtime power management also works in ganged mode, which is currently also broken. Reported-by: Jonathan Hunter Tested-by: Jonathan Hunter Signed-off-by: Thierry Reding

gpu: host1x: mipi: Power down regulators when unused

2015-08-13T11:47:21Z

Keep track of the number of users of DSI and CSI pads and power down the regulators that supply the bricks when all users are gone. Signed-off-by: Thierry Reding

gpu: host1x: mipi: Add Tegra210 support

2015-08-13T11:47:20Z

Some changes are needed to the configuration settings for some lanes. In addition, the clock lanes for the CSI pads can no longer be calibrated. Signed-off-by: Thierry Reding

gpu: host1x: mipi: Add Tegra132 support

2015-08-13T11:47:19Z

While Tegra132 has the same pads as Tegra124, some configuration values need to be programmed slightly differently. Signed-off-by: Thierry Reding

gpu: host1x: mipi: Constify OF match table

2015-08-13T11:47:18Z

This table is never modified and can therefore reside in read-only memory. Signed-off-by: Thierry Reding