From: Giulio Benetti Date: Tue, 13 Mar 2018 12:20:19 +0100 Subject: drm/sun4i: add lvds mode_valid function Git-commit: e4e4b7ad50cfd6e8ee4dc358cf4eeeb29b612f35 Patch-mainline: v4.17-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 mode_valid function is missing for lvds. Add it making it pointed by encoder helper functions. Signed-off-by: Giulio Benetti Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/1520940019-68977-1-git-send-email-giulio.benetti@micronovasrl.com Acked-by: Petr Tesarik --- drivers/gpu/drm/sun4i/sun4i_lvds.c | 55 +++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) --- a/drivers/gpu/drm/sun4i/sun4i_lvds.c +++ b/drivers/gpu/drm/sun4i/sun4i_lvds.c @@ -94,9 +94,64 @@ static void sun4i_lvds_encoder_disable(s } } +static enum drm_mode_status sun4i_lvds_encoder_mode_valid(struct drm_encoder *crtc, + const struct drm_display_mode *mode) +{ + struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(crtc); + struct sun4i_tcon *tcon = lvds->tcon; + u32 hsync = mode->hsync_end - mode->hsync_start; + u32 vsync = mode->vsync_end - mode->vsync_start; + unsigned long rate = mode->clock * 1000; + long rounded_rate; + + DRM_DEBUG_DRIVER("Validating modes...\n"); + + if (hsync < 1) + return MODE_HSYNC_NARROW; + + if (hsync > 0x3ff) + return MODE_HSYNC_WIDE; + + if ((mode->hdisplay < 1) || (mode->htotal < 1)) + return MODE_H_ILLEGAL; + + if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff)) + return MODE_BAD_HVALUE; + + DRM_DEBUG_DRIVER("Horizontal parameters OK\n"); + + if (vsync < 1) + return MODE_VSYNC_NARROW; + + if (vsync > 0x3ff) + return MODE_VSYNC_WIDE; + + if ((mode->vdisplay < 1) || (mode->vtotal < 1)) + return MODE_V_ILLEGAL; + + if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff)) + return MODE_BAD_VVALUE; + + DRM_DEBUG_DRIVER("Vertical parameters OK\n"); + + tcon->dclk_min_div = 7; + tcon->dclk_max_div = 7; + rounded_rate = clk_round_rate(tcon->dclk, rate); + if (rounded_rate < rate) + return MODE_CLOCK_LOW; + + if (rounded_rate > rate) + return MODE_CLOCK_HIGH; + + DRM_DEBUG_DRIVER("Clock rate OK\n"); + + return MODE_OK; +} + static const struct drm_encoder_helper_funcs sun4i_lvds_enc_helper_funcs = { .disable = sun4i_lvds_encoder_disable, .enable = sun4i_lvds_encoder_enable, + .mode_valid = sun4i_lvds_encoder_mode_valid, }; static const struct drm_encoder_funcs sun4i_lvds_enc_funcs = {