On Sun, Dec 15, 2019 at 10:33:06PM +0100, Hans de Goede wrote:
> Commit 82daca297506 ("drm/i915: Add "panel orientation" property to the
> panel connector, v6.") uses hardware state readback to determine if the
> GOP is rotating the image by 180 degrees to compensate for upside-down
> mounted panels.
>
> When I wrote that commit I tried to find the VBT bits the GOP used to
> decide to rotate the image, but I could not find them. Back then I only
> looked at the rotation bits in struct mipi_config and these read 0 on
> the 1 BYT device I have with an upside-down mounted panel
> (a GP-electronic T701 tablet). While working on a similar problem on a
> BYT device with an eDP panel I noticed that the new
> intel_dsi_get_panel_orientation() helper which gets used on newer
> SoCs (Apollo-Lake, etc.) checks the rotate_180 bit in the
> BDB_GENERAL_FEATURES VBT block.
>
> I've checked and this bit indeed is set on the GP-electronic T701 tablet,
> so using the generic intel_dsi_get_panel_orientation() helper there does
> the right thing without needing any extra readback of hw state.
>
> This commit removes the special handling of the panel orientation for
> DSI panels on BYT/CHT devices, bringing the handling in line with the
> handling of DSI panels on other devices.
>
> Signed-off-by: Hans de Goede <hdego...@redhat.com>
Same as
https://patchwork.freedesktop.org/patch/257787/?series=51274&rev=4
which I apparently never pushed. But feel free to go with your version
since you have more meat in the commit msg.
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/display/vlv_dsi.c | 55 +-------------------------
> 1 file changed, 1 insertion(+), 54 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c
> b/drivers/gpu/drm/i915/display/vlv_dsi.c
> index 0ca49b1604c6..18f7616e6c27 100644
> --- a/drivers/gpu/drm/i915/display/vlv_dsi.c
> +++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
> @@ -1563,59 +1563,6 @@ static const struct drm_connector_funcs
> intel_dsi_connector_funcs = {
> .atomic_duplicate_state = intel_digital_connector_duplicate_state,
> };
>
> -static enum drm_panel_orientation
> -vlv_dsi_get_hw_panel_orientation(struct intel_connector *connector)
> -{
> - struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> - struct intel_encoder *encoder = connector->encoder;
> - enum intel_display_power_domain power_domain;
> - enum drm_panel_orientation orientation;
> - struct intel_plane *plane;
> - struct intel_crtc *crtc;
> - intel_wakeref_t wakeref;
> - enum pipe pipe;
> - u32 val;
> -
> - if (!encoder->get_hw_state(encoder, &pipe))
> - return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> -
> - crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
> - plane = to_intel_plane(crtc->base.primary);
> -
> - power_domain = POWER_DOMAIN_PIPE(pipe);
> - wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
> - if (!wakeref)
> - return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> -
> - val = I915_READ(DSPCNTR(plane->i9xx_plane));
> -
> - if (!(val & DISPLAY_PLANE_ENABLE))
> - orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> - else if (val & DISPPLANE_ROTATE_180)
> - orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
> - else
> - orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
> -
> - intel_display_power_put(dev_priv, power_domain, wakeref);
> -
> - return orientation;
> -}
> -
> -static enum drm_panel_orientation
> -vlv_dsi_get_panel_orientation(struct intel_connector *connector)
> -{
> - struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> - enum drm_panel_orientation orientation;
> -
> - if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
> - orientation = vlv_dsi_get_hw_panel_orientation(connector);
> - if (orientation != DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
> - return orientation;
> - }
> -
> - return intel_dsi_get_panel_orientation(connector);
> -}
> -
> static void vlv_dsi_add_properties(struct intel_connector *connector)
> {
> struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -1633,7 +1580,7 @@ static void vlv_dsi_add_properties(struct
> intel_connector *connector)
> connector->base.state->scaling_mode = DRM_MODE_SCALE_ASPECT;
>
> connector->base.display_info.panel_orientation =
> - vlv_dsi_get_panel_orientation(connector);
> + intel_dsi_get_panel_orientation(connector);
> drm_connector_init_panel_orientation_property(
> &connector->base,
> connector->panel.fixed_mode->hdisplay,
> --
> 2.23.0
--
Ville Syrjälä
Intel
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