From: "Yannick Fertré" <yannick.fertre@st.com>
To: Yannick Fertre <yannick.fertre@st.com>,
Philippe Cornu <philippe.cornu@st.com>,
Benjamin Gaignard <benjamin.gaignard@st.com>,
Vincent Abriou <vincent.abriou@st.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
<dri-devel@lists.freedesktop.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH] drm/stm: dsi: higher pll out only in video burst mode
Date: Thu, 12 Sep 2019 10:56:29 +0200 [thread overview]
Message-ID: <1568278589-20400-1-git-send-email-yannick.fertre@st.com> (raw)
In order to better support video non-burst modes,
the +20% on pll out is added only in burst mode.
Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Reviewed-by: Yannick FERTRE <yannick.fertre@st.com>
---
drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
index a03a642..514efef 100644
--- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
+++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
@@ -260,8 +260,11 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
/* Compute requested pll out */
bpp = mipi_dsi_pixel_format_to_bpp(format);
pll_out_khz = mode->clock * bpp / lanes;
+
/* Add 20% to pll out to be higher than pixel bw (burst mode only) */
- pll_out_khz = (pll_out_khz * 12) / 10;
+ if (mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
+ pll_out_khz = (pll_out_khz * 12) / 10;
+
if (pll_out_khz > dsi->lane_max_kbps) {
pll_out_khz = dsi->lane_max_kbps;
DRM_WARN("Warning max phy mbps is used\n");
--
2.7.4
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next reply other threads:[~2019-09-12 8:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-12 8:56 Yannick Fertré [this message]
2019-09-16 13:16 ` [PATCH] drm/stm: dsi: higher pll out only in video burst mode Benjamin Gaignard
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