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OMAP: DSS2: DSI: Get line buffer size from DSI_GNQ register

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The line buffer sizes vary across DSI modules, create a function
dsi_get_line_buf_size() using DSI_GNQ register to get the size of
line buffer used for the DISPC video port data.

Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Archit Taneja 2011-05-16 15:17:09 +05:30 committed by Tomi Valkeinen
parent 75d7247c07
commit 0c65622b1f
1 changed files with 32 additions and 4 deletions
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36
drivers/video/omap2/dss/dsi.c
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@ -2036,6 +2036,37 @@ static inline int dsi_get_num_data_lanes_dssdev(struct omap_dss_device *dssdev)
return num_data_lanes;
}
static unsigned dsi_get_line_buf_size(struct platform_device *dsidev)
{
int val;
/* line buffer on OMAP3 is 1024 x 24bits */
/* XXX: for some reason using full buffer size causes
* considerable TX slowdown with update sizes that fill the
* whole buffer */
if (!dss_has_feature(FEAT_DSI_GNQ))
return 1023 * 3;
val = REG_GET(dsidev, DSI_GNQ, 14, 12); /* VP1_LINE_BUFFER_SIZE */
switch (val) {
case 1:
return 512 * 3; /* 512x24 bits */
case 2:
return 682 * 3; /* 682x24 bits */
case 3:
return 853 * 3; /* 853x24 bits */
case 4:
return 1024 * 3; /* 1024x24 bits */
case 5:
return 1194 * 3; /* 1194x24 bits */
case 6:
return 1365 * 3; /* 1365x24 bits */
default:
BUG();
}
}
static void dsi_set_lane_config(struct omap_dss_device *dssdev)
{
struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);
@ -3771,10 +3802,7 @@ static void dsi_update_screen_dispc(struct omap_dss_device *dssdev,
u32 l;
int r;
const unsigned channel = dsi->update_channel;
/* line buffer is 1024 x 24bits */
/* XXX: for some reason using full buffer size causes considerable TX
* slowdown with update sizes that fill the whole buffer */
const unsigned line_buf_size = 1023 * 3;
const unsigned line_buf_size = dsi_get_line_buf_size(dsidev);
DSSDBG("dsi_update_screen_dispc(%d,%d %dx%d)\n",
x, y, w, h);