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    Subject[PATCH 3/4] Intel FB: force even line count in interlaced mode
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    Intel FB: the chip adds two halflines automatically in interlaced mode,
    force even line count for the right timings.

    Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>

    --- a/drivers/video/intelfb/intelfbhw.c
    +++ b/drivers/video/intelfb/intelfbhw.c
    @@ -317,6 +317,14 @@ int intelfbhw_validate_mode(struct intelfb_info *dinfo,
    var->yres, VACTIVE_MASK + 1);
    return 1;
    }
    + if (var->xres < 4) {
    + WRN_MSG("X resolution too small (%d vs 4).\n", var->xres);
    + return 1;
    + }
    + if (var->yres < 4) {
    + WRN_MSG("Y resolution too small (%d vs 4).\n", var->yres);
    + return 1;
    + }

    /* Check for doublescan modes. */
    if (var->vmode & FB_VMODE_DOUBLE) {
    @@ -324,6 +332,11 @@ int intelfbhw_validate_mode(struct intelfb_info *dinfo,
    return 1;
    }

    + if ((var->vmode & FB_VMODE_INTERLACED) && (var->yres & 1)) {
    + WRN_MSG("Odd number of lines in interlaced mode\n");
    + return 1;
    + }
    +
    /* Check if clock is OK. */
    tmp = 1000000000 / var->pixclock;
    if (tmp < MIN_CLOCK) {
    @@ -1127,6 +1140,8 @@ int intelfbhw_mode_to_hw(struct intelfb_info *dinfo,
    hblank_end);

    vactive = var->yres;
    + if (var->vmode & FB_VMODE_INTERLACED)
    + vactive--; /* the chip adds 2 halflines automatically */
    vsync_start = vactive + var->lower_margin;
    vsync_end = vsync_start + var->vsync_len;
    vtotal = vsync_end + var->upper_margin;
    -
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