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drm/tegra: Fixes for v4.8-rc4
This contains one fix for DSI runtime power management support that was introduced in v4.8-rc1. This is slightly more elaborate than I would've wished, but there are a few corner cases that needed fixing. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIwBAABCAAaBQJXvaiSExx0cmVkaW5nQG52aWRpYS5jb20ACgkQ3SOs138+s6Hv jg/6AnYkczQYraAb8Oy2YO3dIfz3r0TLGEEnY3AKudur867mNG0V59JcUXHQYKin FL7z4iIEx21RAtA9gUEc7xz9gitXP2W/GqRG6v1u0wLn+GS72TuNZCsqUVPQ6Glr yg0uLPoxsFyLa3rsTgif5jXxpsbSd6OV2NdkpImqt1EQLaOWYSNqLLq/YNvMsvCK QivRvvJEYznIyJayIN/PDekfYY3L5esMQNdDEI9jJKdJrTykQThx2eOIbsgY4MyC sdp/h9R23O1ZFvfGONrQHOOzDGumhDJtsRfew+q9JoBaOOgztk2LmPpRZFQsIrmV 1rv1ahQh3boPWw3cSoQMCE8E3Eu2wD/zNrWYbKyhjChx/HTaSPyQGwk0v2WycizA KnNo3eQOTT/5Wb/KvhCaef4Q+yc4LbcAC8T3pkYyGVy+yhUOXr4SGOQLh4Za0Sag uaM20wk3TPYAiyUKZFE7RZ1WHtOp56gOIHbS5eV5ppuR2lmoCh4vK5yCojaz4gww DAHzldegReurS3du613KrV63lue1r3nwX1f0kKDsWd4yN0FH/74g/QC1jXKqJmmk ZevqKCQ1eoaPyOMQI2G0rvRL4B63s800oHO2L760e5SdbM1/Oraxzc+FobGZz9KW Y55SyNnn3QT5HcH6dntmisnuSbZVXVNonEJaPJWFLH/ChgI= =lyq1 -----END PGP SIGNATURE----- Merge tag 'drm/tegra/for-4.8-rc4' of git://anongit.freedesktop.org/tegra/linux into drm-fixes drm/tegra: Fixes for v4.8-rc4 This contains one fix for DSI runtime power management support that was introduced in v4.8-rc1. This is slightly more elaborate than I would've wished, but there are a few corner cases that needed fixing. * tag 'drm/tegra/for-4.8-rc4' of git://anongit.freedesktop.org/tegra/linux: drm/tegra: dsi: Enhance runtime power management
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commit
30bffd1b44
@ -840,6 +840,21 @@ static const struct drm_encoder_funcs tegra_dsi_encoder_funcs = {
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.destroy = tegra_output_encoder_destroy,
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};
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static void tegra_dsi_unprepare(struct tegra_dsi *dsi)
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{
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int err;
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if (dsi->slave)
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tegra_dsi_unprepare(dsi->slave);
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err = tegra_mipi_disable(dsi->mipi);
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if (err < 0)
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dev_err(dsi->dev, "failed to disable MIPI calibration: %d\n",
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err);
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pm_runtime_put(dsi->dev);
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}
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static void tegra_dsi_encoder_disable(struct drm_encoder *encoder)
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{
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struct tegra_output *output = encoder_to_output(encoder);
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@ -876,7 +891,26 @@ static void tegra_dsi_encoder_disable(struct drm_encoder *encoder)
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tegra_dsi_disable(dsi);
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pm_runtime_put(dsi->dev);
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tegra_dsi_unprepare(dsi);
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}
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static void tegra_dsi_prepare(struct tegra_dsi *dsi)
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{
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int err;
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pm_runtime_get_sync(dsi->dev);
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err = tegra_mipi_enable(dsi->mipi);
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if (err < 0)
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dev_err(dsi->dev, "failed to enable MIPI calibration: %d\n",
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err);
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err = tegra_dsi_pad_calibrate(dsi);
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if (err < 0)
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dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
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if (dsi->slave)
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tegra_dsi_prepare(dsi->slave);
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}
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static void tegra_dsi_encoder_enable(struct drm_encoder *encoder)
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@ -887,13 +921,8 @@ static void tegra_dsi_encoder_enable(struct drm_encoder *encoder)
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struct tegra_dsi *dsi = to_dsi(output);
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struct tegra_dsi_state *state;
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u32 value;
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int err;
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pm_runtime_get_sync(dsi->dev);
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err = tegra_dsi_pad_calibrate(dsi);
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if (err < 0)
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dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
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tegra_dsi_prepare(dsi);
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state = tegra_dsi_get_state(dsi);
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@ -242,20 +242,6 @@ struct tegra_mipi_device *tegra_mipi_request(struct device *device)
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dev->pads = args.args[0];
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dev->device = device;
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mutex_lock(&dev->mipi->lock);
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if (dev->mipi->usage_count++ == 0) {
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err = tegra_mipi_power_up(dev->mipi);
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if (err < 0) {
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dev_err(dev->mipi->dev,
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"failed to power up MIPI bricks: %d\n",
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err);
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return ERR_PTR(err);
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}
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}
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mutex_unlock(&dev->mipi->lock);
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return dev;
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put:
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@ -270,30 +256,43 @@ EXPORT_SYMBOL(tegra_mipi_request);
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void tegra_mipi_free(struct tegra_mipi_device *device)
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{
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int err;
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mutex_lock(&device->mipi->lock);
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if (--device->mipi->usage_count == 0) {
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err = tegra_mipi_power_down(device->mipi);
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if (err < 0) {
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/*
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* Not much that can be done here, so an error message
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* will have to do.
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*/
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dev_err(device->mipi->dev,
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"failed to power down MIPI bricks: %d\n",
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err);
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}
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}
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mutex_unlock(&device->mipi->lock);
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platform_device_put(device->pdev);
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kfree(device);
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}
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EXPORT_SYMBOL(tegra_mipi_free);
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int tegra_mipi_enable(struct tegra_mipi_device *dev)
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{
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int err = 0;
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mutex_lock(&dev->mipi->lock);
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if (dev->mipi->usage_count++ == 0)
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err = tegra_mipi_power_up(dev->mipi);
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mutex_unlock(&dev->mipi->lock);
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return err;
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}
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EXPORT_SYMBOL(tegra_mipi_enable);
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int tegra_mipi_disable(struct tegra_mipi_device *dev)
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{
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int err = 0;
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mutex_lock(&dev->mipi->lock);
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if (--dev->mipi->usage_count == 0)
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err = tegra_mipi_power_down(dev->mipi);
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mutex_unlock(&dev->mipi->lock);
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return err;
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}
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EXPORT_SYMBOL(tegra_mipi_disable);
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static int tegra_mipi_wait(struct tegra_mipi *mipi)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(250);
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@ -304,6 +304,8 @@ struct tegra_mipi_device;
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struct tegra_mipi_device *tegra_mipi_request(struct device *device);
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void tegra_mipi_free(struct tegra_mipi_device *device);
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int tegra_mipi_enable(struct tegra_mipi_device *device);
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int tegra_mipi_disable(struct tegra_mipi_device *device);
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int tegra_mipi_calibrate(struct tegra_mipi_device *device);
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#endif
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