From f41cb153e6faf0d1f4bbe0b0f15aa20de1e43e90 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 23 Nov 2018 16:30:20 +0200 Subject: [PATCH] drm: rcar-du: dw-hdmi: Reject modes with a too high clock frequency Implement a .mode_valid() handler in the R-Car glue layer to reject modes with an unsupported clock frequency. Signed-off-by: Laurent Pinchart Reviewed-by: Kieran Bingham --- drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c b/drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c index 75490a3e0a2a..603bb340e8cf 100644 --- a/drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c +++ b/drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c @@ -35,6 +35,20 @@ static const struct rcar_hdmi_phy_params rcar_hdmi_phy_params[] = { { ~0UL, 0x0000, 0x0000, 0x0000 }, }; +static enum drm_mode_status +rcar_hdmi_mode_valid(struct drm_connector *connector, + const struct drm_display_mode *mode) +{ + /* + * The maximum supported clock frequency is 297 MHz, as shown in the PHY + * parameters table. + */ + if (mode->clock > 297000) + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + static int rcar_hdmi_phy_configure(struct dw_hdmi *hdmi, const struct dw_hdmi_plat_data *pdata, unsigned long mpixelclock) @@ -59,6 +73,7 @@ static int rcar_hdmi_phy_configure(struct dw_hdmi *hdmi, } static const struct dw_hdmi_plat_data rcar_dw_hdmi_plat_data = { + .mode_valid = rcar_hdmi_mode_valid, .configure_phy = rcar_hdmi_phy_configure, }; -- 2.45.2