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8299d1f057
Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted patches, wireless patches and defconfig patches. bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 4B v1.1 4G bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
46 lines
1.6 KiB
Diff
46 lines
1.6 KiB
Diff
From cd097b7d08cef3c0e79f5d2ab2776c6c6b00a869 Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Tue, 10 Nov 2020 20:04:08 +0000
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Subject: [PATCH] vc4: Clear unused infoframe packet RAM registers
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Using a hdmi analyser the bytes in packet ram
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registers beyond the length were visible in the
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infoframes and it flagged the checksum as invalid.
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Zeroing unused words of packet RAM avoids this
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Signed-off-by: Dom Cobley <popcornmix@gmail.com>
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
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+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
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@@ -284,9 +284,11 @@ static void vc4_hdmi_write_infoframe(str
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const struct vc4_hdmi_register *ram_packet_start =
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&vc4_hdmi->variant->registers[HDMI_RAM_PACKET_START];
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u32 packet_reg = ram_packet_start->offset + VC4_HDMI_PACKET_STRIDE * packet_id;
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+ u32 packet_reg_next = ram_packet_start->offset +
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+ VC4_HDMI_PACKET_STRIDE * (packet_id + 1);
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void __iomem *base = __vc4_hdmi_get_field_base(vc4_hdmi,
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ram_packet_start->reg);
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- uint8_t buffer[VC4_HDMI_PACKET_STRIDE];
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+ uint8_t buffer[VC4_HDMI_PACKET_STRIDE] = {};
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ssize_t len, i;
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int ret;
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@@ -319,6 +321,13 @@ static void vc4_hdmi_write_infoframe(str
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packet_reg += 4;
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}
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+ /*
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+ * clear remainder of packet ram as it's included in the
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+ * infoframe and triggers a checksum error on hdmi analyser
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+ */
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+ for (; packet_reg < packet_reg_next; packet_reg += 4)
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+ writel(0, base + packet_reg);
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+
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HDMI_WRITE(HDMI_RAM_PACKET_CONFIG,
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HDMI_READ(HDMI_RAM_PACKET_CONFIG) | BIT(packet_id));
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ret = wait_for((HDMI_READ(HDMI_RAM_PACKET_STATUS) &
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