59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
From 6b2c9d84c7accdfe1067fcdc8a00e50674aab4bb Mon Sep 17 00:00:00 2001
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From: Tomi Valkeinen <tomi.valkeinen@nokia.com>
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Date: Thu, 2 Apr 2009 17:42:26 +0300
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Subject: [PATCH] DSS2: DSI: improve packet len calculation
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---
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drivers/video/omap2/dss/dsi.c | 21 ++++++++++++++++-----
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1 files changed, 16 insertions(+), 5 deletions(-)
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diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
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index aecb89d..66ac6ea 100644
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--- a/drivers/video/omap2/dss/dsi.c
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+++ b/drivers/video/omap2/dss/dsi.c
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@@ -2624,17 +2624,28 @@ static void dsi_update_screen_dispc(struct omap_display *display,
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u16 x, u16 y, u16 w, u16 h)
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{
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int bytespp = 3;
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+ int len;
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int total_len;
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- int line_packet_len;
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+ int packet_payload;
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+ int packet_len;
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u32 l;
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if (dsi.update_mode == OMAP_DSS_UPDATE_MANUAL)
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DSSDBG("dsi_update_screen_dispc(%d,%d %dx%d)\n",
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x, y, w, h);
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- /* TODO: one packet could be longer, I think? Max is the line buffer */
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- line_packet_len = w * bytespp + 1; /* 1 byte for DCS cmd */
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- total_len = line_packet_len * h;
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+ len = w * h * bytespp;
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+
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+ /* XXX: one packet could be longer, I think? Line buffer is
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+ * 1024 x 24bits, but we have to put DCS cmd there also.
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+ * 1023 * 3 should work, but causes strange color effects. */
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+ packet_payload = min(w, (u16)1020) * bytespp;
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+
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+ packet_len = packet_payload + 1; /* 1 byte for DCS cmd */
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+ total_len = (len / packet_payload) * packet_len;
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+
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+ if (len % packet_payload)
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+ total_len += (len % packet_payload) + 1;
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display->ctrl->setup_update(display, x, y, w, h);
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@@ -2646,7 +2657,7 @@ static void dsi_update_screen_dispc(struct omap_display *display,
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l = FLD_VAL(total_len, 23, 0); /* TE_SIZE */
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dsi_write_reg(DSI_VC_TE(1), l);
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- dsi_vc_write_long_header(1, DSI_DT_DCS_LONG_WRITE, line_packet_len, 0);
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+ dsi_vc_write_long_header(1, DSI_DT_DCS_LONG_WRITE, packet_len, 0);
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if (dsi.use_te)
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l = FLD_MOD(l, 1, 30, 30); /* TE_EN */
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--
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1.5.6.5
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