Re: [PATCH 04/12] drm: Add support for alternate clocks of 4k modes

Simon Farnsworth
2013-08-14T09:33:09Z

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A few minor things:

On Wednesday 14 August 2013 00:17:20 Damien Lespiau wrote:
> Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
> ---
> drivers/gpu/drm/drm_edid.c | 68 ++++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 62 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 0faa08e..606335f 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -2409,6 +2409,54 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
> }
> EXPORT_SYMBOL(drm_match_cea_mode);
>
> +/*
> + * Calculate the alternate clock for HDMI modes (those from the HDMI vendor
> + * specific block).
> + *
> + * It's almost like cea_mode_alternate_clock(), we just need to add an
> + * exception for the VIC 4 mode (4096x2160@24Hz): no alternate clock for this
> + * one.
> + */
> +static unsigned int
> +hdmi_mode_alternate_clock(const struct drm_display_mode *hdmi_mode)
> +{
> + if (hdmi_mode->vdisplay == 4096 && hdmi_mode->hdisplay == 2160)
> + return hdmi_mode->clock;
> +
> + return cea_mode_alternate_clock(hdmi_mode);
> +}
> +
> +/*
> + * drm_match_cea_mode - look for a HDMI mode matching given mode

Here we document drm_match_cea_mode, but the function is drm_match_hdmi_mode.

> + * @to_match: display mode
> + *
> + * An HDMI mode is one defined in the HDMI vendor specific block.
> + *
> + * Returns the HDMI Video ID (VIC) of the mode or 0 if it isn't one.
> + */
> +static u8 drm_match_hmdi_mode(const struct drm_display_mode *to_match)
^^^^
Surely should be hdmi, not hmdi?
> +{
> + u8 mode;
> +
> + if (!to_match->clock)
> + return 0;
> +
> + for (mode = 0; mode < ARRAY_SIZE(edid_4k_modes); mode++) {
> + const struct drm_display_mode *hdmi_mode = &edid_4k_modes[mode];
> + unsigned int clock1, clock2;
> +
> + /* Make sure to also match alternate clocks */
> + clock1 = hdmi_mode->clock;
> + clock2 = hdmi_mode_alternate_clock(hdmi_mode);
> +
> + if ((KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock1) ||
> + KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock2)) &&
> + drm_mode_equal_no_clocks(to_match, hdmi_mode))
> + return mode + 1;
> + }
> + return 0;
> +}
> +
> static int
> add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
> {
> @@ -2426,18 +2474,26 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
> * with the alternate clock for certain CEA modes.
> */
> list_for_each_entry(mode, &connector->probed_modes, head) {
> - const struct drm_display_mode *cea_mode;
> + const struct drm_display_mode *cea_mode = NULL;
> struct drm_display_mode *newmode;
> - u8 cea_mode_idx = drm_match_cea_mode(mode) - 1;
> + u8 mode_idx = drm_match_cea_mode(mode) - 1;
> unsigned int clock1, clock2;
>
> - if (cea_mode_idx >= ARRAY_SIZE(edid_cea_modes))
> - continue;
> + if (mode_idx < ARRAY_SIZE(edid_cea_modes)) {
> + cea_mode = &edid_cea_modes[mode_idx];
> + clock2 = cea_mode_alternate_clock(cea_mode);
> + } else {
> + mode_idx = drm_match_hmdi_mode(mode) - 1;
^^^^
Same typo here - hmdi for hdmi.

> + if (mode_idx < ARRAY_SIZE(edid_4k_modes)) {
> + cea_mode = &edid_4k_modes[mode_idx];
> + clock2 = hdmi_mode_alternate_clock(cea_mode);
> + }
> + }
>
> - cea_mode = &edid_cea_modes[cea_mode_idx];
> + if (!cea_mode)
> + continue;
>
> clock1 = cea_mode->clock;
> - clock2 = cea_mode_alternate_clock(cea_mode);
>
> if (clock1 == clock2)
> continue;
>
--
Simon Farnsworth
Software Engineer
ONELAN Ltd
http://www.onelan.com

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