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path: root/drivers/video/omap2/dss/sdi.c
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Diffstat (limited to 'drivers/video/omap2/dss/sdi.c')
-rw-r--r--drivers/video/omap2/dss/sdi.c70
1 files changed, 69 insertions, 1 deletions
diff --git a/drivers/video/omap2/dss/sdi.c b/drivers/video/omap2/dss/sdi.c
index 62b5374..e6baee2 100644
--- a/drivers/video/omap2/dss/sdi.c
+++ b/drivers/video/omap2/dss/sdi.c
@@ -41,6 +41,72 @@ static struct {
struct omap_dss_output output;
} sdi;
+struct sdi_clk_calc_ctx {
+ unsigned long pck_min, pck_max;
+
+ struct dss_clock_info dss_cinfo;
+ struct dispc_clock_info dispc_cinfo;
+};
+
+static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
+ unsigned long pck, void *data)
+{
+ struct sdi_clk_calc_ctx *ctx = data;
+
+ ctx->dispc_cinfo.lck_div = lckd;
+ ctx->dispc_cinfo.pck_div = pckd;
+ ctx->dispc_cinfo.lck = lck;
+ ctx->dispc_cinfo.pck = pck;
+
+ return true;
+}
+
+static bool dpi_calc_dss_cb(int fckd, unsigned long fck, void *data)
+{
+ struct sdi_clk_calc_ctx *ctx = data;
+
+ ctx->dss_cinfo.fck = fck;
+ ctx->dss_cinfo.fck_div = fckd;
+
+ return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
+ dpi_calc_dispc_cb, ctx);
+}
+
+static int sdi_calc_clock_div(unsigned long pclk,
+ struct dss_clock_info *dss_cinfo,
+ struct dispc_clock_info *dispc_cinfo)
+{
+ int i;
+ struct sdi_clk_calc_ctx ctx;
+
+ /*
+ * DSS fclk gives us very few possibilities, so finding a good pixel
+ * clock may not be possible. We try multiple times to find the clock,
+ * each time widening the pixel clock range we look for, up to
+ * +/- 1MHz.
+ */
+
+ for (i = 0; i < 10; ++i) {
+ bool ok;
+
+ memset(&ctx, 0, sizeof(ctx));
+ if (pclk > 1000 * i * i * i)
+ ctx.pck_min = max(pclk - 1000 * i * i * i, 0lu);
+ else
+ ctx.pck_min = 0;
+ ctx.pck_max = pclk + 1000 * i * i * i;
+
+ ok = dss_div_calc(ctx.pck_min, dpi_calc_dss_cb, &ctx);
+ if (ok) {
+ *dss_cinfo = ctx.dss_cinfo;
+ *dispc_cinfo = ctx.dispc_cinfo;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
static void sdi_config_lcd_manager(struct omap_dss_device *dssdev)
{
struct omap_overlay_manager *mgr = dssdev->output->manager;
@@ -88,7 +154,7 @@ int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
t->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
t->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
- r = dss_calc_clock_div(t->pixel_clock * 1000, &dss_cinfo, &dispc_cinfo);
+ r = sdi_calc_clock_div(t->pixel_clock * 1000, &dss_cinfo, &dispc_cinfo);
if (r)
goto err_calc_clock_div;
@@ -278,6 +344,8 @@ static void __init sdi_init_output(struct platform_device *pdev)
out->pdev = pdev;
out->id = OMAP_DSS_OUTPUT_SDI;
out->type = OMAP_DISPLAY_TYPE_SDI;
+ out->name = "sdi.0";
+ out->dispc_channel = OMAP_DSS_CHANNEL_LCD;
dss_register_output(out);
}
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