On 04.09.24 10:31 AM, Dominique Martinet wrote: > This allows the hdmi driver to pick e.g. 64.8MHz instead of 65Mhz when we > cannot output the exact frequency, enabling the imx8mp HDMI output to > support more modes > > Signed-off-by: Dominique Martinet <dominique.martinet@xxxxxxxxxxxxxxxxx> Reviewed-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx> Tested-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx> > --- > This completes the patch series sent by Adam Ford here: > https://lkml.kernel.org/r/20240904023310.163371-1-aford173@xxxxxxxxx > > and makes the cheap screens we recommend work with our imx8mp board > without further kludging. > > > drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c > index 13bc570c5473..9431cd5e06c3 100644 > --- a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c > +++ b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c > @@ -23,6 +23,7 @@ imx8mp_hdmi_mode_valid(struct dw_hdmi *dw_hdmi, void *data, > const struct drm_display_mode *mode) > { > struct imx8mp_hdmi *hdmi = (struct imx8mp_hdmi *)data; > + long round_rate; > > if (mode->clock < 13500) > return MODE_CLOCK_LOW; > @@ -30,8 +31,9 @@ imx8mp_hdmi_mode_valid(struct dw_hdmi *dw_hdmi, void *data, > if (mode->clock > 297000) > return MODE_CLOCK_HIGH; > > - if (clk_round_rate(hdmi->pixclk, mode->clock * 1000) != > - mode->clock * 1000) > + round_rate = clk_round_rate(hdmi->pixclk, mode->clock * 1000); > + /* accept 0.5% = 1/200 = 5/1000 tolerance */ > + if (abs(round_rate - mode->clock * 1000) > mode->clock * 5) > return MODE_CLOCK_RANGE; > > /* We don't support double-clocked and Interlaced modes */
