MIXER in SoCs prior to Exynos5420 supports only 4 video modes:
720x480, 720x576, 1280x720, 1920x1080. Support for other modes
can be enabled by manipulating timings of HDMI. To do it
adjusted_mode should contain actual mode set on crtc.
With this patch it is possible to enable 1024x768 and 1280x1024
modes in MIXER.
Suggested-by: Daniel Drake <drake@xxxxxxxxxxxx>
Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Reviewed-by: Tobias Jakobi <tjakobi@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_hdmi.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 7225b6521148..4b081f6cfdcb 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -1239,6 +1239,17 @@ static void hdmi_v13_mode_apply(struct hdmi_context *hdata)
static void hdmi_v14_mode_apply(struct hdmi_context *hdata)
{
struct drm_display_mode *m = &hdata->encoder.crtc->state->mode;
+ struct drm_display_mode *am = &hdata->encoder.crtc->state->adjusted_mode;
+ int hquirk = 0;
+
+ /*
+ * In case video mode coming from CRTC differs from requested one HDMI
+ * sometimes is able to almost properly perform conversion - only
+ * first line is distorted.
+ */
+ if ((m->vdisplay != am->vdisplay) &&
+ (m->hdisplay == 1280 || m->hdisplay == 1024))
+ hquirk = 258;
hdmi_reg_writev(hdata, HDMI_H_BLANK_0, 2, m->htotal - m->hdisplay);
hdmi_reg_writev(hdata, HDMI_V_LINE_0, 2, m->vtotal);
@@ -1332,8 +1343,8 @@ static void hdmi_v14_mode_apply(struct hdmi_context *hdata)
hdmi_reg_writev(hdata, HDMI_V_SYNC_LINE_AFT_PXL_6_0, 2, 0xffff);
hdmi_reg_writev(hdata, HDMI_TG_H_FSZ_L, 2, m->htotal);
- hdmi_reg_writev(hdata, HDMI_TG_HACT_ST_L, 2, m->htotal - m->hdisplay);
- hdmi_reg_writev(hdata, HDMI_TG_HACT_SZ_L, 2, m->hdisplay);
+ hdmi_reg_writev(hdata, HDMI_TG_HACT_ST_L, 2, m->htotal - m->hdisplay - hquirk);
+ hdmi_reg_writev(hdata, HDMI_TG_HACT_SZ_L, 2, m->hdisplay + hquirk);
hdmi_reg_writev(hdata, HDMI_TG_V_FSZ_L, 2, m->vtotal);
if (hdata->drv_data == &exynos5433_hdmi_driver_data)
hdmi_reg_writeb(hdata, HDMI_TG_DECON_EN, 1);
--
2.14.1
--
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