RE: RFBI worked example

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With further experimentation it appears that I can call the
omap_rfbi_update() from the call back, but as the callback is in interrupt
context this could be dangerous. I would love to see an example of this
elsewhere.

static void framedone_callback(void *data)
{
    int r;
    u16 dw, dh;
    struct omap_dss_device *dssdev = (struct omap_dss_device *)data;

    /* Start the next update, triggered on the external H/VSync signals */
    dssdev->driver->get_resolution(dssdev, &dw, &dh);
    r = omap_rfbi_update(dssdev, 0, 0, dw, dh, framedone_callback,
dssdev);
    if (r < 0)
        printk("omap_rfbi_update FAILED");
}

static int generic_panel_power_on(struct omap_dss_device *dssdev)
{
    int r;
    u16 dw, dh;

    r = omapdss_rfbi_display_enable(dssdev);
    if (r < 0)
        goto err0;

    /* Setup external HSYNC/VSYNC triggering */
    r = omap_rfbi_setup_te(OMAP_DSS_RFBI_TE_MODE_2,
                           4000000,     /* HSYNS pulse 4uS */
                           1000000000,  /* VSYNC pulse 1ms */
                           0, 0,       /* H/VSYNC not inverted */
                           0);
    if (r < 0)
        goto err1;

    /* Enable external triggering */
    r = omap_rfbi_enable_te(1, 0);
    if (r < 0)
        goto err1;

#if 0
    /* At a guess I do not think we need to do the prepare_update
     * if we are updating the whole area
     */
    r = omap_rfbi_prepare_update(dssdev, ???);
    if (r < 0)
        goto err1;
#endif

    /* Start the first update, triggered on the external H/VSync siganls.
     * The callback (FRAMEDONE interrupt context) will re-arm this
     * update once more.
     */
    dssdev->driver->get_resolution(dssdev, &dw, &dh);
    r = omap_rfbi_update(dssdev, 0, 0, dw, dh, framedone_callback,
dssdev);
    if (r < 0)
        goto err1;


    if (dssdev->platform_enable) {
        r = dssdev->platform_enable(dssdev);
        if (r)
            goto err1;
    }

    return 0;
err1:
    omap_rfbi_enable_te(0, 0);
    omapdss_dpi_display_disable(dssdev);
err0:
    return r;
}




-----Original Message-----
From: Ben Tucker [mailto:btucker@xxxxxxxxxxx]
Sent: 06 January 2011 15:32
To: 'linux-omap@xxxxxxxxxxxxxxx'
Cc: 'tomi.valkeinen@xxxxxxxxx'
Subject: RFBI worked example



Hi,

I am trying to setup an OMAP3530 based system for RFBI video output using
external triggering. Looking at the omap dss2 source code (and also
searching around) I cannot find any worked example of how to use the rfbi
driver. I know that RFBI has worked in the past for a Nokia N800 device.
Can you dig out any source code that shows how to use the RFBI driver?
In particular I need to see how the omap_rfbi_prepare_update() and
omap_rfbi_update() calls operate with their callback. I am thinking that I
should simply call omap_rfbi_update() in a thread and wait for the
completion call back after each call. I want to confirm that this is the
correct way to run the driver.

Thanks,
	Ben



Ben Tucker
Senior Software Engineer
MPC Data Limited
e-mail: <btucker@xxxxxxxxxxxxxx>      web: www.mpc-data.co.uk
tel: +44 (0) 1225 710600              fax: +44 (0) 1225 710601
ddi: +44 (0) 1225 710660

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