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950-0275-drm-vc4-Query-firmware-for-custom-HDMI-mode.patch
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950-0275-drm-vc4-Query-firmware-for-custom-HDMI-mode.patch
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From 6402d9c21c9b144d528c3248607589db94ecbce0 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Wed, 3 Jul 2019 17:44:53 +0100
Subject: [PATCH] drm/vc4: Query firmware for custom HDMI mode
Allow custom HDMI modes to be specified from config.txt,
and these then override EDID parsing.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
drivers/gpu/drm/vc4/vc4_firmware_kms.c | 130 ++++++++++++++-----------
1 file changed, 75 insertions(+), 55 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
@@ -1066,6 +1066,56 @@ vc4_fkms_connector_detect(struct drm_con
return connector_status_connected;
}
+/* Queries the firmware to populate a drm_mode structure for this display */
+static int vc4_fkms_get_fw_mode(struct vc4_fkms_connector *fkms_connector,
+ struct drm_display_mode *mode)
+{
+ struct vc4_dev *vc4 = fkms_connector->vc4_dev;
+ struct set_timings timings = { 0 };
+ int ret;
+
+ timings.display = fkms_connector->display_number;
+
+ ret = rpi_firmware_property(vc4->firmware,
+ RPI_FIRMWARE_GET_DISPLAY_TIMING, &timings,
+ sizeof(timings));
+ if (ret || !timings.clock)
+ /* No mode returned - abort */
+ return -1;
+
+ /* Equivalent to DRM_MODE macro. */
+ memset(mode, 0, sizeof(*mode));
+ strncpy(mode->name, "FIXED_MODE", sizeof(mode->name));
+ mode->status = 0;
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ mode->clock = timings.clock;
+ mode->hdisplay = timings.hdisplay;
+ mode->hsync_start = timings.hsync_start;
+ mode->hsync_end = timings.hsync_end;
+ mode->htotal = timings.htotal;
+ mode->hskew = 0;
+ mode->vdisplay = timings.vdisplay;
+ mode->vsync_start = timings.vsync_start;
+ mode->vsync_end = timings.vsync_end;
+ mode->vtotal = timings.vtotal;
+ mode->vscan = timings.vscan;
+
+ if (timings.flags & TIMINGS_FLAGS_H_SYNC_POS)
+ mode->flags |= DRM_MODE_FLAG_PHSYNC;
+ else
+ mode->flags |= DRM_MODE_FLAG_NHSYNC;
+
+ if (timings.flags & TIMINGS_FLAGS_V_SYNC_POS)
+ mode->flags |= DRM_MODE_FLAG_PVSYNC;
+ else
+ mode->flags |= DRM_MODE_FLAG_NVSYNC;
+
+ if (timings.flags & TIMINGS_FLAGS_INTERLACE)
+ mode->flags |= DRM_MODE_FLAG_INTERLACE;
+
+ return 0;
+}
+
static int vc4_fkms_get_edid_block(void *data, u8 *buf, unsigned int block,
size_t len)
{
@@ -1094,25 +1144,35 @@ static int vc4_fkms_connector_get_modes(
to_vc4_fkms_connector(connector);
struct drm_encoder *encoder = fkms_connector->encoder;
struct vc4_fkms_encoder *vc4_encoder = to_vc4_fkms_encoder(encoder);
- int ret = 0;
+ struct drm_display_mode fw_mode;
+ struct drm_display_mode *mode;
struct edid *edid;
+ int num_modes;
- edid = drm_do_get_edid(connector, vc4_fkms_get_edid_block,
- fkms_connector);
+ if (!vc4_fkms_get_fw_mode(fkms_connector, &fw_mode)) {
+ drm_mode_debug_printmodeline(&fw_mode);
+ mode = drm_mode_duplicate(connector->dev,
+ &fw_mode);
+ drm_mode_probed_add(connector, mode);
+ num_modes = 1; /* 1 mode */
+ } else {
+ edid = drm_do_get_edid(connector, vc4_fkms_get_edid_block,
+ fkms_connector);
- /* FIXME: Can we do CEC?
- * cec_s_phys_addr_from_edid(vc4->hdmi->cec_adap, edid);
- * if (!edid)
- * return -ENODEV;
- */
-
- vc4_encoder->hdmi_monitor = drm_detect_hdmi_monitor(edid);
-
- drm_connector_update_edid_property(connector, edid);
- ret = drm_add_edid_modes(connector, edid);
- kfree(edid);
+ /* FIXME: Can we do CEC?
+ * cec_s_phys_addr_from_edid(vc4->hdmi->cec_adap, edid);
+ * if (!edid)
+ * return -ENODEV;
+ */
+
+ vc4_encoder->hdmi_monitor = drm_detect_hdmi_monitor(edid);
+
+ drm_connector_update_edid_property(connector, edid);
+ num_modes = drm_add_edid_modes(connector, edid);
+ kfree(edid);
+ }
- return ret;
+ return num_modes;
}
/* This is the DSI panel resolution. Use this as a default should the firmware
@@ -1130,55 +1190,15 @@ static int vc4_fkms_lcd_connector_get_mo
{
struct vc4_fkms_connector *fkms_connector =
to_vc4_fkms_connector(connector);
- struct vc4_dev *vc4 = fkms_connector->vc4_dev;
struct drm_display_mode *mode;
- struct mailbox_set_mode mb = {
- .tag1 = { RPI_FIRMWARE_GET_DISPLAY_TIMING,
- sizeof(struct set_timings), 0},
- .timings = { .display = fkms_connector->display_number },
- };
struct drm_display_mode fw_mode;
- int ret = 0;
-
- ret = rpi_firmware_property_list(vc4->firmware, &mb, sizeof(mb));
- if (!ret) {
- /* Equivalent to DRM_MODE macro. */
- memset(&fw_mode, 0, sizeof(fw_mode));
- strncpy(fw_mode.name, "LCD_MODE", sizeof(fw_mode.name));
- fw_mode.status = 0;
- fw_mode.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
- fw_mode.clock = mb.timings.clock;
- fw_mode.hdisplay = mb.timings.hdisplay;
- fw_mode.hsync_start = mb.timings.hsync_start;
- fw_mode.hsync_end = mb.timings.hsync_end;
- fw_mode.htotal = mb.timings.htotal;
- fw_mode.hskew = 0;
- fw_mode.vdisplay = mb.timings.vdisplay;
- fw_mode.vsync_start = mb.timings.vsync_start;
- fw_mode.vsync_end = mb.timings.vsync_end;
- fw_mode.vtotal = mb.timings.vtotal;
- fw_mode.vscan = mb.timings.vscan;
- if (mb.timings.flags & TIMINGS_FLAGS_H_SYNC_POS)
- fw_mode.flags |= DRM_MODE_FLAG_PHSYNC;
- else
- fw_mode.flags |= DRM_MODE_FLAG_NHSYNC;
- if (mb.timings.flags & TIMINGS_FLAGS_V_SYNC_POS)
- fw_mode.flags |= DRM_MODE_FLAG_PVSYNC;
- else
- fw_mode.flags |= DRM_MODE_FLAG_NVSYNC;
- if (mb.timings.flags & TIMINGS_FLAGS_V_SYNC_POS)
- fw_mode.flags |= DRM_MODE_FLAG_PVSYNC;
- else
- fw_mode.flags |= DRM_MODE_FLAG_NVSYNC;
- if (mb.timings.flags & TIMINGS_FLAGS_INTERLACE)
- fw_mode.flags |= DRM_MODE_FLAG_INTERLACE;
+ if (!vc4_fkms_get_fw_mode(fkms_connector, &fw_mode) && fw_mode.clock)
mode = drm_mode_duplicate(connector->dev,
&fw_mode);
- } else {
+ else
mode = drm_mode_duplicate(connector->dev,
&lcd_mode);
- }
if (!mode) {
DRM_ERROR("Failed to create a new display mode\n");