On Fri, Apr 05, 2019 at 05:13:49PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrj...@linux.intel.com>
>
> The only bpc information in pipe registers for BXT/GLK DSI
> is the PIPEMISC dither bpc. Let's try to use that to read
> out pipe_bpp on these platforms. However, I'm not sure if
> this will be correctly populated by the GOP since bspec
> suggests it's only needed if dithering is actually enabled.
> If not I guess we'll have to go one step further and
> extract pipe_bpp from the DSI pixel format when dithering
> is disabled.
>
> Cc: Hans de Goede <hdego...@redhat.com>
> Fixes: ca0b04db14a5 ("drm/i915/dsi: Fix pipe_bpp for handling for 6 bpc
> pixel-formats")
> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Reviewed-by: Imre Deak <imre.d...@intel.com>
> ---
> drivers/gpu/drm/i915/vlv_dsi.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/vlv_dsi.c b/drivers/gpu/drm/i915/vlv_dsi.c
> index 0a950c976bbb..6898541403a2 100644
> --- a/drivers/gpu/drm/i915/vlv_dsi.c
> +++ b/drivers/gpu/drm/i915/vlv_dsi.c
> @@ -256,6 +256,28 @@ static void band_gap_reset(struct drm_i915_private
> *dev_priv)
> mutex_unlock(&dev_priv->sb_lock);
> }
>
> +static int bdw_get_pipemisc_bpp(struct intel_crtc *crtc)
> +{
> + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> + u32 tmp;
> +
> + tmp = I915_READ(PIPEMISC(crtc->pipe));
> +
> + switch (tmp & PIPEMISC_DITHER_BPC_MASK) {
> + case PIPEMISC_DITHER_6_BPC:
> + return 18;
> + case PIPEMISC_DITHER_8_BPC:
> + return 24;
> + case PIPEMISC_DITHER_10_BPC:
> + return 30;
> + case PIPEMISC_DITHER_12_BPC:
> + return 36;
> + default:
> + MISSING_CASE(tmp);
> + return 0;
> + }
> +}
> +
> static int intel_dsi_compute_config(struct intel_encoder *encoder,
> struct intel_crtc_state *pipe_config,
> struct drm_connector_state *conn_state)
> @@ -1082,6 +1104,8 @@ static void bxt_dsi_get_pipe_config(struct
> intel_encoder *encoder,
> bpp = mipi_dsi_pixel_format_to_bpp(
> pixel_format_from_register_bits(fmt));
>
> + pipe_config->pipe_bpp = bdw_get_pipemisc_bpp(crtc);
> +
> /* Enable Frame time stamo based scanline reporting */
> adjusted_mode->private_flags |=
> I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
> --
> 2.19.2
>
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