From: Paul Kocialkowski <paul.kocialkowski@bootlin.com> To: Maxime Ripard <maxime.ripard@bootlin.com>, Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, Sean Paul <seanpaul@chromium.org> Cc: bbrezillon@kernel.org, dri-devel@lists.freedesktop.org, Chen-Yu Tsai <wens@csie.org>, Thomas Petazzoni <thomas.petazzoni@bootlin.com>, Jagan Teki <jagan@openedev.com>, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 6/8] drm/sun4i: dsi: Rework a bit the hblk calculation Date: Wed, 13 Feb 2019 15:41:41 +0100 Message-ID: <5ad700e4037a58a0621476299a0de02d2f24de11.camel@bootlin.com> (raw) In-Reply-To: <d79a21b09847579ce907212a59737af21a729dd0.1549896081.git-series.maxime.ripard@bootlin.com> Hi, On Mon, 2019-02-11 at 15:41 +0100, Maxime Ripard wrote: > It turns out that the hblk calculation actually follows a similar pattern > than the other packets. Rework a bit the calculation and add a comment. This looks consistent with what the BSP is doing for video mode. Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> Cheers, Paul > Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> > --- > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > index 8e6392831e9d..e0288e7dc64e 100644 > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > @@ -488,9 +488,13 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, > (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD); > > /* > - * hblk seems to be the line + porches length. > + * The blanking is set using a sync event (4 bytes) and a > + * blanking packet (4 bytes + payload + 2 bytes). Its minimal > + * size is therefore 10 bytes. > */ > - hblk = mode->htotal * Bpp - hsa; > +#define HBLK_PACKET_OVERHEAD 10 > + hblk = max((unsigned int)HBLK_PACKET_OVERHEAD, > + (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp - HBLK_PACKET_OVERHEAD); > > /* > * And I'm not entirely sure what vblk is about. The driver in -- Paul Kocialkowski, Bootlin Embedded Linux and kernel engineering https://bootlin.com _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply index Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-11 14:41 [PATCH v3 0/8] drm/sun4i: dsi: Add burst mode support Maxime Ripard 2019-02-11 14:41 ` [PATCH v3 1/8] drm/sun4i: dsi: Restrict DSI tcon clock divider Maxime Ripard 2019-02-11 14:41 ` [PATCH v3 2/8] drm/sun4i: dsi: Change the start delay calculation Maxime Ripard 2019-02-12 15:28 ` Paul Kocialkowski 2019-02-12 15:45 ` Maxime Ripard 2019-02-11 14:41 ` [PATCH v3 3/8] drm/sun4i: dsi: Enforce boundaries on the start delay Maxime Ripard 2019-02-12 15:30 ` Paul Kocialkowski 2019-02-14 9:21 ` Maxime Ripard 2019-02-11 14:41 ` [PATCH v3 4/8] drm/sun4i: dsi: Fix front vs back porch calculation Maxime Ripard 2019-02-12 15:41 ` Paul Kocialkowski 2019-02-11 14:41 ` [PATCH v3 5/8] drm/sun4i: dsi: Fix DRQ calculation Maxime Ripard 2019-02-13 14:33 ` Paul Kocialkowski 2019-02-14 9:23 ` Maxime Ripard 2019-02-11 14:41 ` [PATCH v3 6/8] drm/sun4i: dsi: Rework a bit the hblk calculation Maxime Ripard 2019-02-13 14:41 ` Paul Kocialkowski [this message] 2019-02-11 14:41 ` [PATCH v3 7/8] drm/sun4i: dsi: Add burst support Maxime Ripard 2019-02-13 14:36 ` Paul Kocialkowski 2019-02-14 9:15 ` Maxime Ripard 2019-02-11 14:41 ` [PATCH v3 8/8] drm/panel: Add Ronbo RB070D30 panel Maxime Ripard 2019-02-11 15:13 ` Sam Ravnborg 2019-02-13 14:26 ` Paul Kocialkowski 2019-02-14 11:07 ` Re[2]: " Konstantin Sudakov 2019-02-12 10:32 ` [PATCH v3 0/8] drm/sun4i: dsi: Add burst mode support Jagan Teki 2019-02-15 14:12 ` Maxime Ripard [not found] ` <CAMty3ZAA90-fHPADJSE3ht9CiYWA3yBoyEy7wVv9=6C5JiaTVw@mail.gmail.com> 2019-02-15 17:07 ` Jagan Teki 2019-02-18 8:26 ` Paul Kocialkowski 2019-02-18 10:31 ` Jagan Teki 2019-02-20 16:35 ` Maxime Ripard 2019-02-26 6:48 ` Jagan Teki
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