diff options
Diffstat (limited to 'drivers/gpu/drm/mgag200/mgag200_vga_bmc.c')
| -rw-r--r-- | drivers/gpu/drm/mgag200/mgag200_vga_bmc.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mgag200/mgag200_vga_bmc.c b/drivers/gpu/drm/mgag200/mgag200_vga_bmc.c new file mode 100644 index 000000000000..a5a3ac108bd5 --- /dev/null +++ b/drivers/gpu/drm/mgag200/mgag200_vga_bmc.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_edid.h> +#include <drm/drm_modeset_helper_vtables.h> +#include <drm/drm_probe_helper.h> + +#include "mgag200_ddc.h" +#include "mgag200_drv.h" + +static void mgag200_vga_bmc_encoder_atomic_disable(struct drm_encoder *encoder, + struct drm_atomic_state *state) +{ + struct mga_device *mdev = to_mga_device(encoder->dev); + + if (mdev->info->sync_bmc) + mgag200_bmc_stop_scanout(mdev); +} + +static void mgag200_vga_bmc_encoder_atomic_enable(struct drm_encoder *encoder, + struct drm_atomic_state *state) +{ + struct mga_device *mdev = to_mga_device(encoder->dev); + + if (mdev->info->sync_bmc) + mgag200_bmc_start_scanout(mdev); +} + +static int mgag200_vga_bmc_encoder_atomic_check(struct drm_encoder *encoder, + struct drm_crtc_state *new_crtc_state, + struct drm_connector_state *new_connector_state) +{ + struct mga_device *mdev = to_mga_device(encoder->dev); + struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state); + + new_mgag200_crtc_state->set_vidrst = mdev->info->sync_bmc; + + return 0; +} + +static const struct drm_encoder_helper_funcs mgag200_dac_encoder_helper_funcs = { + .atomic_disable = mgag200_vga_bmc_encoder_atomic_disable, + .atomic_enable = mgag200_vga_bmc_encoder_atomic_enable, + .atomic_check = mgag200_vga_bmc_encoder_atomic_check, +}; + +static const struct drm_encoder_funcs mgag200_dac_encoder_funcs = { + .destroy = drm_encoder_cleanup +}; + +static int mgag200_vga_bmc_connector_helper_get_modes(struct drm_connector *connector) +{ + struct mga_device *mdev = to_mga_device(connector->dev); + const struct mgag200_device_info *minfo = mdev->info; + int count; + + count = drm_connector_helper_get_modes(connector); + + if (!count) { + /* + * There's no EDID data without a connected monitor. Set BMC- + * compatible modes in this case. The XGA default resolution + * should work well for all BMCs. + */ + count = drm_add_modes_noedid(connector, minfo->max_hdisplay, minfo->max_vdisplay); + if (count) + drm_set_preferred_mode(connector, 1024, 768); + } + + return count; +} + +/* + * There's no monitor connected if the DDC did not return an EDID. Still + * return 'connected' as there's always a BMC. Incrementing the connector's + * epoch counter triggers an update of the related properties. + */ +static int mgag200_vga_bmc_connector_helper_detect_ctx(struct drm_connector *connector, + struct drm_modeset_acquire_ctx *ctx, + bool force) +{ + enum drm_connector_status old_status, status; + + if (connector->edid_blob_ptr) + old_status = connector_status_connected; + else + old_status = connector_status_disconnected; + + status = drm_connector_helper_detect_from_ddc(connector, ctx, force); + + if (status != old_status) + ++connector->epoch_counter; + return connector_status_connected; +} + +static const struct drm_connector_helper_funcs mgag200_vga_connector_helper_funcs = { + .get_modes = mgag200_vga_bmc_connector_helper_get_modes, + .detect_ctx = mgag200_vga_bmc_connector_helper_detect_ctx, +}; + +static const struct drm_connector_funcs mgag200_vga_connector_funcs = { + .reset = drm_atomic_helper_connector_reset, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = drm_connector_cleanup, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state +}; + +int mgag200_vga_bmc_output_init(struct mga_device *mdev) +{ + struct drm_device *dev = &mdev->base; + struct drm_crtc *crtc = &mdev->crtc; + struct drm_encoder *encoder; + struct drm_connector *connector; + struct i2c_adapter *ddc; + int ret; + + encoder = &mdev->output.vga.encoder; + ret = drm_encoder_init(dev, encoder, &mgag200_dac_encoder_funcs, + DRM_MODE_ENCODER_DAC, NULL); + if (ret) { + drm_err(dev, "drm_encoder_init() failed: %d\n", ret); + return ret; + } + drm_encoder_helper_add(encoder, &mgag200_dac_encoder_helper_funcs); + + encoder->possible_crtcs = drm_crtc_mask(crtc); + + ddc = mgag200_ddc_create(mdev); + if (IS_ERR(ddc)) { + ret = PTR_ERR(ddc); + drm_err(dev, "failed to add DDC bus: %d\n", ret); + return ret; + } + + connector = &mdev->output.vga.connector; + ret = drm_connector_init_with_ddc(dev, connector, + &mgag200_vga_connector_funcs, + DRM_MODE_CONNECTOR_VGA, ddc); + if (ret) { + drm_err(dev, "drm_connector_init_with_ddc() failed: %d\n", ret); + return ret; + } + drm_connector_helper_add(connector, &mgag200_vga_connector_helper_funcs); + + connector->polled = DRM_CONNECTOR_POLL_CONNECT | + DRM_CONNECTOR_POLL_DISCONNECT; + + ret = drm_connector_attach_encoder(connector, encoder); + if (ret) { + drm_err(dev, "drm_connector_attach_encoder() failed: %d\n", ret); + return ret; + } + + return 0; +} |