Hi, On Tue, Mar 28, 2023 at 09:28:19PM +0200, Frank Oltmanns wrote: > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > @@ -819,6 +819,34 @@ static void sun6i_dsi_encoder_disable(struct drm_encoder > *encoder) > regulator_disable(dsi->regulator); > } > > +static bool sun6i_dsi_encoder_mode_fixup( > + struct drm_encoder *encoder, > + const struct drm_display_mode *mode, > + struct drm_display_mode *adjusted_mode)
So, mode_fixup is kind of deprecated in favour of atomic_check > +{ > + if (encoder->encoder_type == DRM_MODE_ENCODER_DSI) { > + /* > + * For DSI the PLL rate has to respect the bits per pixel and > + * number of lanes. > + * > + * According to the BSP code: > + * PLL rate = DOTCLOCK * bpp / lanes > + * > + * Therefore, the clock has to be adjusted in order to set the > + * correct PLL rate when actually setting the clock. > + */ > + struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder); > + struct mipi_dsi_device *device = dsi->device; > + u8 bpp = mipi_dsi_pixel_format_to_bpp(device->format); > + u8 lanes = device->lanes; > + > + adjusted_mode->crtc_clock = mode->crtc_clock > + * bpp / (lanes * SUN6I_DSI_TCON_DIV); And that's visible to the userspace, so it's not where we should store that value. I guess the best way to do something similar would be to store it into crtc_state, and then reuse it there. But it starts to make a lot of rather complicated code compared to your previous patch. Maxime
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