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68 lines
2.3 KiB
Diff
68 lines
2.3 KiB
Diff
From 1fbbd377bd1c6b4e3342d03091f19089ccb7fcbe Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.org>
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Date: Tue, 28 May 2019 13:56:06 +0100
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Subject: [PATCH] drm: vc4: handle the case where there are no
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available displays
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It's reasonable for the firmware to return zero as the number of
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attached displays. Handle this case as otherwise drm thinks that
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the DSI panel is attached, which is nonsense.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org>
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---
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drivers/gpu/drm/vc4/vc4_firmware_kms.c | 32 +++++++++++++++-----------
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1 file changed, 18 insertions(+), 14 deletions(-)
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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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@@ -1303,13 +1303,13 @@ static int vc4_fkms_bind(struct device *
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RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS,
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&num_displays, sizeof(u32));
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- /* If we fail to get the number of displays, or it returns 0, then
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+ /* If we fail to get the number of displays, then
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* assume old firmware that doesn't have the mailbox call, so just
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* set one display
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*/
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- if (ret || num_displays == 0) {
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+ if (ret) {
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num_displays = 1;
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- DRM_WARN("Unable to determine number of displays's. Assuming 1\n");
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+ DRM_WARN("Unable to determine number of displays - assuming 1\n");
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ret = 0;
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}
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@@ -1338,17 +1338,21 @@ static int vc4_fkms_bind(struct device *
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display_num);
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}
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- /* Map the SMI interrupt reg */
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- crtc_list[0]->regs = vc4_ioremap_regs(pdev, 0);
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- if (IS_ERR(crtc_list[0]->regs))
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- DRM_ERROR("Oh dear, failed to map registers\n");
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-
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- writel(0, crtc_list[0]->regs + SMICS);
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- ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
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- vc4_crtc_irq_handler, 0, "vc4 firmware kms",
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- crtc_list);
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- if (ret)
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- DRM_ERROR("Oh dear, failed to register IRQ\n");
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+ if (num_displays > 0) {
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+ /* Map the SMI interrupt reg */
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+ crtc_list[0]->regs = vc4_ioremap_regs(pdev, 0);
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+ if (IS_ERR(crtc_list[0]->regs))
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+ DRM_ERROR("Oh dear, failed to map registers\n");
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+
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+ writel(0, crtc_list[0]->regs + SMICS);
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+ ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
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+ vc4_crtc_irq_handler, 0,
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+ "vc4 firmware kms", crtc_list);
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+ if (ret)
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+ DRM_ERROR("Oh dear, failed to register IRQ\n");
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+ } else {
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+ DRM_WARN("No displays found. Consider forcing hotplug if HDMI is attached\n");
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+ }
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platform_set_drvdata(pdev, crtc_list);
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