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From 13723c680a129d79a7872ee131c0201374ba62ce Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Tue, 9 Apr 2019 12:37:28 +0100
Subject: [PATCH] drm: vc4: Query the display ID for each display in
FKMS
Replace the hard coded list of display IDs for a mailbox call
that returns the display ID for each display that has been
detected.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
drivers/gpu/drm/vc4/vc4_firmware_kms.c | 16 +++++++++++++---
include/soc/bcm2835/raspberrypi-firmware.h | 1 +
2 files changed, 14 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
@@ -943,7 +943,7 @@ static int vc4_fkms_bind(struct device *
struct vc4_crtc **crtc_list;
u32 num_displays, display_num;
int ret;
- const u32 display_num_lookup[] = {2, 7, 1};
+ u32 display_id;
vc4->firmware_kms = true;
@@ -982,8 +982,18 @@ static int vc4_fkms_bind(struct device *
return -ENOMEM;
for (display_num = 0; display_num < num_displays; display_num++) {
- ret = vc4_fkms_create_screen(dev, drm, display_num,
- display_num_lookup[display_num],
+ display_id = display_num;
+ ret = rpi_firmware_property(vc4->firmware,
+ RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_ID,
+ &display_id, sizeof(display_id));
+ /* FIXME: Determine the correct error handling here.
+ * Should we fail to create the one "screen" but keep the
+ * others, or fail the whole thing?
+ */
+ if (ret)
+ DRM_ERROR("Failed to get display id %u\n", display_num);
+
+ ret = vc4_fkms_create_screen(dev, drm, display_num, display_id,
&crtc_list[display_num]);
if (ret)
DRM_ERROR("Oh dear, failed to create display %u\n",
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -117,6 +117,7 @@ enum rpi_firmware_property_tag {
RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF = 0x0004000f,
RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF = 0x00040010,
RPI_FIRMWARE_FRAMEBUFFER_RELEASE = 0x00048001,
+ RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_ID = 0x00040016,
RPI_FIRMWARE_FRAMEBUFFER_SET_DISPLAY_NUM = 0x00048013,
RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS = 0x00040013,
RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_SETTINGS = 0x00040014,
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