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| author | Yannick Fertre <yannick.fertre@st.com> | 2018-06-29 13:22:22 +0200 |
|---|---|---|
| committer | Benjamin Gaignard <benjamin.gaignard@linaro.org> | 2018-07-06 10:15:36 +0200 |
| commit | 7868e5079228b4c07cf61b5ad5d35af5c29f7375 (patch) | |
| tree | 89a569279cc887faef8d68952e8c584a09471935 /drivers/gpu/drm/stm/ltdc.c | |
| parent | drm: print plane state normalized zpos value (diff) | |
| download | linux-7868e5079228b4c07cf61b5ad5d35af5c29f7375.tar.xz linux-7868e5079228b4c07cf61b5ad5d35af5c29f7375.zip | |
drm/stm: ltdc: filter mode pixel clock vs pad constraint
Filter the requested mode pixel clock frequency according
to the pad maximum supported frequency.
Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
Tested-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1530271342-5532-1-git-send-email-yannick.fertre@st.com
Diffstat (limited to 'drivers/gpu/drm/stm/ltdc.c')
| -rw-r--r-- | drivers/gpu/drm/stm/ltdc.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index d997a6014d6c..f1f37336a57a 100644 --- a/drivers/gpu/drm/stm/ltdc.c +++ b/drivers/gpu/drm/stm/ltdc.c @@ -457,6 +457,14 @@ ltdc_crtc_mode_valid(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 @@ -468,10 +476,6 @@ ltdc_crtc_mode_valid(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. @@ -991,11 +995,15 @@ 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; |