Hi, Philipp,
Thanks for your comment.
On Wed, 2016-07-20 at 11:41 +0200, Philipp Zabel wrote:
> Am Mittwoch, den 20.07.2016, 12:03 +0800 schrieb Bibby Hsieh:
> > From: Junzhi Zhao <junzhi.zhao@xxxxxxxxxxxx>
> >
> > Pixel clock should be 297MHz when resolution is 4K.
> >
> > Signed-off-by: Junzhi Zhao <junzhi.zhao@xxxxxxxxxxxx>
> > Signed-off-by: Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/mediatek/mtk_dpi.c | 184 +++++++++++++++++++++++++-----------
> > 1 file changed, 131 insertions(+), 53 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > index d05ca79..c0f04d2 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -60,14 +60,35 @@ enum mtk_dpi_out_color_format {
> > MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL
> > };
> >
> > +enum mtk_dpi_clk_id {
> > + MTK_DPI_CLK_DPI_ENGINE,
> > + MTK_DPI_CLK_DPI_PIXEL,
> > + MTK_DPI_CLK_TVD_PLL,
> > + MTK_DPI_CLK_TVDPLL_MUX,
> > + MTK_DPI_CLK_TVDPLL_D2,
> > + MTK_DPI_CLK_TVDPLL_D4,
> > + MTK_DPI_CLK_TVDPLL_D8,
> > + MTK_DPI_CLK_TVDPLL_D16,
> > + MTK_DPI_CLK_COUNT,
> > +};
>
> I think this is going in the wrong direction. If the pixel clock output
> isn't correct after a clk_set_rate(dpi->pixel_clk, rate), the clock
> drivers should be fixed, not worked around in the dpi driver.
>
> The TVDPLL_* mux and dividers are not direct inputs to the DPI module:
>
> tvdpll ("pll")
> | ..|\
> v ..| | mm_sel ----> mm_dpi_engine ("engine")
> tvdpll_594m(1/3) ..|/
> |
> |`-> tvdpll_d2 -->|\
> |`-> tvdpll_d4 -->| | dpi0_sel --> mm_dpi_pixel ("pixel")
> |`-> tvdpll_d8 -->| |
> `--> tvdpll_d16 ->|/
>
> Currently the code first sets the "pll" to the desired multiple of the
> pixel clock manually (*3*4, *3*8) and than calls clk_set_rate on the
> "pixel" clock which gets propagated by the clock framework up to
> dpi0_sel. Since dpi0_sel doesn't have the CLK_SET_RATE_PARENT flag set,
> it should just choose the tvdpll_d* input divider. I'd like not to give
> the dpi driver direct access to all the intermediate clocks.
>
Ok, I will make some modifications according to your comment.
> regards
> Philipp
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
