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75 lines
2.3 KiB
Diff
75 lines
2.3 KiB
Diff
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From aa791f2cb6777e8ca99102009b631afdeea1c59d Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Fri, 3 Jul 2020 16:06:55 +0100
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Subject: [PATCH] drm/vc4: FKMS Block modes with odd horizontal
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timing values on Pi4
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Pi4 HDMI pipeline is 2 pixels/clock and can not produce timings
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that have odd values for active pixels, front porch, sync width,
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or back porch.
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Detect these modes and block them within fkms.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/gpu/drm/vc4/vc4_firmware_kms.c | 21 +++++++++++++++++++++
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1 file changed, 21 insertions(+)
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--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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@@ -44,6 +44,7 @@ struct get_display_cfg {
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struct vc4_fkms {
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struct get_display_cfg cfg;
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+ bool bcm2711;
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};
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#define PLANES_PER_CRTC 3
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@@ -1097,6 +1098,17 @@ vc4_crtc_mode_valid(struct drm_crtc *crt
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break;
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}
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+ /* Pi4 can't generate odd horizontal timings on HDMI, so reject modes
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+ * that would set them.
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+ */
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+ if (fkms->bcm2711 &&
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+ (vc4_crtc->display_number == 2 || vc4_crtc->display_number == 7) &&
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+ ((mode->hdisplay | /* active */
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+ (mode->hsync_start - mode->hdisplay) | /* front porch */
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+ (mode->hsync_end - mode->hsync_start) | /* sync pulse */
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+ (mode->htotal - mode->hsync_end)) & 1)) /* back porch */
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+ return MODE_H_ILLEGAL;
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+
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return MODE_OK;
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}
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@@ -1282,6 +1294,8 @@ static const struct drm_crtc_helper_func
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static const struct of_device_id vc4_firmware_kms_dt_match[] = {
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{ .compatible = "raspberrypi,rpi-firmware-kms" },
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+ { .compatible = "raspberrypi,rpi-firmware-kms-2711",
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+ .data = (void *)1 },
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{}
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};
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@@ -1815,6 +1829,7 @@ static int vc4_fkms_bind(struct device *
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struct drm_device *drm = dev_get_drvdata(master);
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struct vc4_dev *vc4 = to_vc4_dev(drm);
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struct device_node *firmware_node;
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+ const struct of_device_id *match;
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struct vc4_crtc **crtc_list;
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u32 num_displays, display_num;
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struct vc4_fkms *fkms;
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@@ -1827,6 +1842,12 @@ static int vc4_fkms_bind(struct device *
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if (!fkms)
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return -ENOMEM;
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+ match = of_match_device(vc4_firmware_kms_dt_match, dev);
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+ if (!match)
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+ return -ENODEV;
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+ if (match->data)
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+ fkms->bcm2711 = true;
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+
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/* firmware kms doesn't have precise a scanoutpos implementation, so
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* we can't do the precise vblank timestamp mode.
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*/
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