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@xxxxxx>
---
drivers/video/omap2/dss/dsi.c | 36 ++++++++++++++++++++++++++++++++----
1 files changed, 32 insertions(+), 4 deletions(-)
diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
index 784677d..345757c 100644
--- a/drivers/video/omap2/dss/dsi.c
+++ b/drivers/video/omap2/dss/dsi.c
@@ -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);
--
1.7.1
--
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