Bilal Wasim <bilalwasim676@xxxxxxxxx> 於 2020年11月20日 週五 上午8:30寫道： > > Hi CK, > > On Fri, 20 Nov 2020 07:23:35 +0800 > Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx> wrote: > > > From: CK Hu <ck.hu@xxxxxxxxxxxx> > > > > In the patch to be fixed, horizontal_backporch_byte become to large > > for some panel, so roll back that patch. For small hfp or hbp panel, > > using vm->hfront_porch + vm->hback_porch to calculate > > horizontal_backporch_byte would make it negtive, so > > use horizontal_backporch_byte itself to make it positive. Applied to mediatek-drm-fixes [1]. [1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-fixes > > > > Fixes: 35bf948f1edb ("drm/mediatek: dsi: Fix scrolling of panel with > > small hfp or hbp") > > > > Signed-off-by: CK Hu <ck.hu@xxxxxxxxxxxx> > > Signed-off-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx> > > --- > > drivers/gpu/drm/mediatek/mtk_dsi.c | 61 > > +++++++++++------------------- 1 file changed, 22 insertions(+), 39 > > deletions(-) > > > > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c > > b/drivers/gpu/drm/mediatek/mtk_dsi.c index 4a188a942c38..65fd99c528af > > 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c > > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c > > @@ -444,7 +444,10 @@ static void mtk_dsi_config_vdo_timing(struct > > mtk_dsi *dsi) u32 horizontal_sync_active_byte; > > u32 horizontal_backporch_byte; > > u32 horizontal_frontporch_byte; > > + u32 horizontal_front_back_byte; > > + u32 data_phy_cycles_byte; > > u32 dsi_tmp_buf_bpp, data_phy_cycles; > > + u32 delta; > > struct mtk_phy_timing *timing = &dsi->phy_timing; > > > > struct videomode *vm = &dsi->vm; > > @@ -466,50 +469,30 @@ static void mtk_dsi_config_vdo_timing(struct > > mtk_dsi *dsi) horizontal_sync_active_byte = (vm->hsync_len * > > dsi_tmp_buf_bpp - 10); > > if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) > > - horizontal_backporch_byte = vm->hback_porch * > > dsi_tmp_buf_bpp; > > + horizontal_backporch_byte = vm->hback_porch * > > dsi_tmp_buf_bpp - 10; else > > horizontal_backporch_byte = (vm->hback_porch + > > vm->hsync_len) * > > - dsi_tmp_buf_bpp; > > + dsi_tmp_buf_bpp - 10; > > > > data_phy_cycles = timing->lpx + timing->da_hs_prepare + > > - timing->da_hs_zero + timing->da_hs_exit; > > - > > - if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) { > > - if ((vm->hfront_porch + vm->hback_porch) * > > dsi_tmp_buf_bpp > > > - data_phy_cycles * dsi->lanes + 18) { > > - horizontal_frontporch_byte = > > - vm->hfront_porch * dsi_tmp_buf_bpp - > > - (data_phy_cycles * dsi->lanes + 18) * > > - vm->hfront_porch / > > - (vm->hfront_porch + vm->hback_porch); > > - > > - horizontal_backporch_byte = > > - horizontal_backporch_byte - > > - (data_phy_cycles * dsi->lanes + 18) * > > - vm->hback_porch / > > - (vm->hfront_porch + vm->hback_porch); > > - } else { > > - DRM_WARN("HFP less than d-phy, FPS will > > under 60Hz\n"); > > - horizontal_frontporch_byte = > > vm->hfront_porch * > > - dsi_tmp_buf_bpp; > > - } > > + timing->da_hs_zero + timing->da_hs_exit + > > 3; + > > + delta = dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST ? 18 : > > 12; + > > + horizontal_frontporch_byte = vm->hfront_porch * > > dsi_tmp_buf_bpp; > > + horizontal_front_back_byte = horizontal_frontporch_byte + > > horizontal_backporch_byte; > > + data_phy_cycles_byte = data_phy_cycles * dsi->lanes + delta; > > + > > + if (horizontal_front_back_byte > data_phy_cycles_byte) { > > + horizontal_frontporch_byte -= data_phy_cycles_byte * > > + > > horizontal_frontporch_byte / > > + > > horizontal_front_back_byte; + > > + horizontal_backporch_byte -= data_phy_cycles_byte * > > + > > horizontal_backporch_byte / > > + > > horizontal_front_back_byte; } else { > > - if ((vm->hfront_porch + vm->hback_porch) * > > dsi_tmp_buf_bpp > > > - data_phy_cycles * dsi->lanes + 12) { > > - horizontal_frontporch_byte = > > - vm->hfront_porch * dsi_tmp_buf_bpp - > > - (data_phy_cycles * dsi->lanes + 12) * > > - vm->hfront_porch / > > - (vm->hfront_porch + vm->hback_porch); > > - horizontal_backporch_byte = > > horizontal_backporch_byte - > > - (data_phy_cycles * dsi->lanes + 12) * > > - vm->hback_porch / > > - (vm->hfront_porch + vm->hback_porch); > > - } else { > > - DRM_WARN("HFP less than d-phy, FPS will > > under 60Hz\n"); > > - horizontal_frontporch_byte = > > vm->hfront_porch * > > - dsi_tmp_buf_bpp; > > - } > > + DRM_WARN("HFP + HBP less than d-phy, FPS will under > > 60Hz\n"); } > > > > writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC); > > Tested on Chromebook ELM. > > Tested-by: Bilal Wasim <bilal.wasim@xxxxxxxxxx> > > Thanks, > Bilal _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
