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authorPhilipp Zabel <p.zabel@pengutronix.de>2015-01-08 01:52:15 +0300
committerPhilipp Zabel <p.zabel@pengutronix.de>2015-02-23 19:19:00 +0300
commit081c80e85feabe9a0081f4db940fccb6443b81fb (patch)
tree54a32b59ec70b0d133595675266e208bdaeb8523 /drivers/gpu/drm/imx
parent89ce4b0f4e7adda75ac7eec6aaa9b3516390cef2 (diff)
downloadlinux-081c80e85feabe9a0081f4db940fccb6443b81fb.tar.xz
drm/imx: dw_hdmi-imx: add mode_valid callback prune unsupported modes
This patch limits the pixel clock to 13.4 MHz - 266 MHz for i.MX6Q and 13.5 MHz - 270 MHz for i.MX6DL, which is the range documented in the HDMI Transmitter chapter of the respective reference manuals. Without this patch, when connected to a monitor capable of 2160p60 modes, dw_hdmi will happily report this mode and the IPU code will cause a division by zero in ipu_di_config_clock when trying to figure out how to divide the 264 MHz HSP clock down to ~600 MHz. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/gpu/drm/imx')
-rw-r--r--drivers/gpu/drm/imx/dw_hdmi-imx.c32
1 files changed, 28 insertions, 4 deletions
diff --git a/drivers/gpu/drm/imx/dw_hdmi-imx.c b/drivers/gpu/drm/imx/dw_hdmi-imx.c
index 121d30ca2d44..d25aaef3cba6 100644
--- a/drivers/gpu/drm/imx/dw_hdmi-imx.c
+++ b/drivers/gpu/drm/imx/dw_hdmi-imx.c
@@ -136,11 +136,34 @@ static struct drm_encoder_funcs dw_hdmi_imx_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
+static enum drm_mode_status imx6q_hdmi_mode_valid(struct drm_connector *con,
+ struct drm_display_mode *mode)
+{
+ if (mode->clock < 13500)
+ return MODE_CLOCK_LOW;
+ if (mode->clock > 266000)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+static enum drm_mode_status imx6dl_hdmi_mode_valid(struct drm_connector *con,
+ struct drm_display_mode *mode)
+{
+ if (mode->clock < 13500)
+ return MODE_CLOCK_LOW;
+ if (mode->clock > 270000)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
- .mpll_cfg = imx_mpll_cfg,
- .cur_ctr = imx_cur_ctr,
- .sym_term = imx_sym_term,
- .dev_type = IMX6Q_HDMI,
+ .mpll_cfg = imx_mpll_cfg,
+ .cur_ctr = imx_cur_ctr,
+ .sym_term = imx_sym_term,
+ .dev_type = IMX6Q_HDMI,
+ .mode_valid = imx6q_hdmi_mode_valid,
};
static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
@@ -148,6 +171,7 @@ static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
.cur_ctr = imx_cur_ctr,
.sym_term = imx_sym_term,
.dev_type = IMX6DL_HDMI,
+ .mode_valid = imx6dl_hdmi_mode_valid,
};
static const struct of_device_id dw_hdmi_imx_dt_ids[] = {