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OMAPDSS: DPI: verify if DSI PLL is operational 

The SoCs that have DSI module should have a working DSI PLL. However,
some rare boards have not connected the powers to the DSI PLL.

This patch adds a function that tries to power up the DSI PLL, and
reports if that doesn't succeed. DPI uses this function to fall back to
PRCM clocks if DSI PLL doesn't work.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2012-10-30 12:57:43 +02:00
parent 8a3db406f5
commit 6061675b3f
1 changed files with 27 additions and 0 deletions
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27
drivers/video/omap2/dss/dpi.c
View File

@ -361,6 +361,28 @@ void omapdss_dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
}
EXPORT_SYMBOL(omapdss_dpi_set_data_lines);
static int __init dpi_verify_dsi_pll(struct platform_device *dsidev)
{
int r;
/* do initial setup with the PLL to see if it is operational */
r = dsi_runtime_get(dsidev);
if (r)
return r;
r = dsi_pll_init(dsidev, 0, 1);
if (r) {
dsi_runtime_put(dsidev);
return r;
}
dsi_pll_uninit(dsidev, true);
dsi_runtime_put(dsidev);
return 0;
}
static int __init dpi_init_display(struct omap_dss_device *dssdev)
{
DSSDBG("init_display\n");
@ -383,6 +405,11 @@ static int __init dpi_init_display(struct omap_dss_device *dssdev)
enum omap_dss_clk_source dispc_fclk_src =
dssdev->clocks.dispc.dispc_fclk_src;
dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
if (dpi_verify_dsi_pll(dpi.dsidev)) {
dpi.dsidev = NULL;
DSSWARN("DSI PLL not operational\n");
}
}
return 0;