Filter the requested mode pixel clock frequency according
to the pad maximum supported frequency.
Signed-off-by: Yannick Fertre <yannick.fer...@st.com>
---
drivers/gpu/drm/stm/ltdc.c | 16 ++++++++++++----
drivers/gpu/drm/stm/ltdc.h | 1 +
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 00e3262..96d20c2 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -491,6 +491,14 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
int target_max = target + CLK_TOLERANCE_HZ;
int result;
+ result = clk_round_rate(ldev->pixel_clk, target);
+
+ DRM_DEBUG_DRIVER("clk rate target %d, available %d\n", target, result);
+
+ /* Filter modes according to the max frequency supported by the pads */
+ if (result > ldev->caps.pad_max_freq_hz)
+ return MODE_CLOCK_HIGH;
+
/*
* Accept all "preferred" modes:
* - this is important for panels because panel clock tolerances are
@@ -502,10 +510,6 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
if (mode->type & DRM_MODE_TYPE_PREFERRED)
return MODE_OK;
- result = clk_round_rate(ldev->pixel_clk, target);
-
- DRM_DEBUG_DRIVER("clk rate target %d, available %d\n", target, result);
-
/*
* Filter modes according to the clock value, particularly useful for
* hdmi modes that require precise pixel clocks.
@@ -1039,11 +1043,15 @@ static int ltdc_get_caps(struct drm_device *ddev)
* does not work on 2nd layer.
*/
ldev->caps.non_alpha_only_l1 = true;
+ ldev->caps.pad_max_freq_hz = 90000000;
+ if (ldev->caps.hw_version == HWVER_10200)
+ ldev->caps.pad_max_freq_hz = 65000000;
break;
case HWVER_20101:
ldev->caps.reg_ofs = REG_OFS_4;
ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a1;
ldev->caps.non_alpha_only_l1 = false;
+ ldev->caps.pad_max_freq_hz = 150000000;
break;
default:
return -ENODEV;
diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
index c14e4db..0294d38 100644
--- a/drivers/gpu/drm/stm/ltdc.h
+++ b/drivers/gpu/drm/stm/ltdc.h
@@ -20,6 +20,7 @@ struct ltdc_caps {
u32 bus_width; /* bus width (32 or 64 bits) */
const u32 *pix_fmt_hw; /* supported pixel formats */
bool non_alpha_only_l1; /* non-native no-alpha formats on layer 1 */
+ int pad_max_freq_hz; /* max frequency supported by pad */
};
#define LTDC_MAX_LAYER 4
--
1.9.1
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