[PATCH] drm/amdgpu: use native mode for dp aux transfer
From: Zhenneng Li
Date: Thu Aug 11 2022 - 07:33:15 EST
When using amdgpu for e8860, the monitor sometimes haven't any signal,
and the kernel reports some errors:
[ 17.317302][ 2] [ T1045] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* channel eq failed: 5 tries
[ 17.326963][ 2] [ T1045] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* channel eq failed
But if I use radeon for e8860, everything are always normal, the reason is
that radeon use native mode and amdgpu use atombios mode
when init dp aux, so when I use native mode for amdgpu, everything
are always normal.
Signed-off-by: Zhenneng Li <lizhenneng@xxxxxxxxxx>
Change-Id: Ia9a2be3ab03e56b1c8337fdbf713461196fbc58f
---
drivers/gpu/drm/amd/amdgpu/Makefile | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c | 5 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_dp_auxch.c | 273 +++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 +
drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h | 2 +
drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 5 +-
7 files changed, 290 insertions(+), 3 deletions(-)
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_dp_auxch.c
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 3e0e2eb7e235..2913cf46f848 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -58,7 +58,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
amdgpu_vm_sdma.o amdgpu_discovery.o amdgpu_ras_eeprom.o amdgpu_nbio.o \
amdgpu_umc.o smu_v11_0_i2c.o amdgpu_fru_eeprom.o amdgpu_rap.o \
amdgpu_fw_attestation.o amdgpu_securedisplay.o \
- amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o
+ amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o amdgpu_dp_auxch.o
amdgpu-$(CONFIG_PROC_FS) += amdgpu_fdinfo.o
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 30ce6bb6fa77..15e0288b1997 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -238,6 +238,8 @@ extern int amdgpu_num_kcq;
#define AMDGPU_VCNFW_LOG_SIZE (32 * 1024)
extern int amdgpu_vcnfw_log;
+extern int amdgpu_auxch;
+
#define AMDGPU_VM_MAX_NUM_CTX 4096
#define AMDGPU_SG_THRESHOLD (256*1024*1024)
#define AMDGPU_DEFAULT_GTT_SIZE_MB 3072ULL /* 3GB by default */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
index 9ba4817a9148..68c8d79e2937 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
@@ -49,7 +49,10 @@ static struct amdgpu_i2c_bus_rec amdgpu_atombios_get_bus_rec_for_i2c_gpio(ATOM_G
memset(&i2c, 0, sizeof(struct amdgpu_i2c_bus_rec));
- i2c.mask_clk_reg = le16_to_cpu(gpio->usClkMaskRegisterIndex);
+ if (amdgpu_auxch)
+ i2c.mask_clk_reg = le16_to_cpu(gpio->usClkMaskRegisterIndex) * 4;
+ else
+ i2c.mask_clk_reg = le16_to_cpu(gpio->usClkMaskRegisterIndex);
i2c.mask_data_reg = le16_to_cpu(gpio->usDataMaskRegisterIndex);
i2c.en_clk_reg = le16_to_cpu(gpio->usClkEnRegisterIndex);
i2c.en_data_reg = le16_to_cpu(gpio->usDataEnRegisterIndex);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dp_auxch.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dp_auxch.c
new file mode 100644
index 000000000000..22078f1ca936
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dp_auxch.c
@@ -0,0 +1,273 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Dave Airlie
+ */
+
+#include "amdgpu.h"
+
+#define AUX_SW_RX_OVERFLOW (1 << 8)
+#define AUX_SW_RX_HPD_DISCON (1 << 9)
+#define AUX_SW_RX_PARTIAL_BYTE (1 << 10)
+#define AUX_SW_NON_AUX_MODE (1 << 11)
+#define AUX_SW_RX_SYNC_INVALID_L (1 << 17)
+#define AUX_SW_RX_SYNC_INVALID_H (1 << 18)
+#define AUX_SW_RX_INVALID_START (1 << 19)
+#define AUX_SW_RX_RECV_NO_DET (1 << 20)
+#define AUX_SW_RX_RECV_INVALID_H (1 << 22)
+#define AUX_SW_RX_RECV_INVALID_V (1 << 23)
+#define AUX_CONTROL 0x6200
+#define AUX_HPD_SEL(x) (((x) & 0x7) << 20)
+#define AUX_EN (1 << 0)
+#define AUX_LS_READ_EN (1 << 8)
+#define AUX_SW_CONTROL 0x6204
+#define AUX_SW_WR_BYTES(x) (((x) & 0x1f) << 16)
+#define AUX_SW_DATA 0x6218
+#define AUX_SW_DATA_RW (1 << 0)
+#define AUX_SW_AUTOINCREMENT_DISABLE (1 << 31)
+#define AUX_SW_INTERRUPT_CONTROL 0x620c
+#define AUX_SW_DONE_ACK (1 << 1)
+#define AUX_SW_GO (1 << 0)
+#define AUX_SW_STATUS 0x6210
+#define AUX_SW_DONE (1 << 0)
+#define AUX_SW_RX_TIMEOUT (1 << 7)
+#define AUX_SW_DATA_RW (1 << 0)
+#define AUX_SW_DATA_MASK(x) (((x) & 0xff) << 8)
+
+#define AUX_RX_ERROR_FLAGS (AUX_SW_RX_OVERFLOW | \
+ AUX_SW_RX_HPD_DISCON | \
+ AUX_SW_RX_PARTIAL_BYTE | \
+ AUX_SW_NON_AUX_MODE | \
+ AUX_SW_RX_SYNC_INVALID_L | \
+ AUX_SW_RX_SYNC_INVALID_H | \
+ AUX_SW_RX_INVALID_START | \
+ AUX_SW_RX_RECV_NO_DET | \
+ AUX_SW_RX_RECV_INVALID_H | \
+ AUX_SW_RX_RECV_INVALID_V)
+
+#define AUX_SW_REPLY_GET_BYTE_COUNT(x) (((x) >> 24) & 0x1f)
+
+#define BARE_ADDRESS_SIZE 3
+
+#define R100_MM_INDEX 0x0000
+#define R100_MM_DATA 0x0004
+#define AMDGPU_MIN_MMIO_SIZE 0x10000
+uint32_t venus_mm_rreg_slow(struct amdgpu_device *adev, uint32_t reg)
+{
+ unsigned long flags;
+ uint32_t ret;
+
+ spin_lock_irqsave(&adev->mmio_idx_lock, flags);
+ writel(reg, ((void __iomem *)adev->rmmio) + R100_MM_INDEX);
+ ret = readl(((void __iomem *)adev->rmmio) + R100_MM_DATA);
+ spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
+ return ret;
+}
+void venus_mm_wreg_slow(struct amdgpu_device *adev, uint32_t reg, uint32_t v)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&adev->mmio_idx_lock, flags);
+ writel(reg, ((void __iomem *)adev->rmmio) + R100_MM_INDEX);
+ writel(v, ((void __iomem *)adev->rmmio) + R100_MM_DATA);
+ spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
+}
+static inline uint32_t venus_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
+ bool always_indirect)
+{
+ /* The mmio size is 64kb at minimum. Allows the if to be optimized out. */
+ if ((reg < adev->rmmio_size || reg < AMDGPU_MIN_MMIO_SIZE) && !always_indirect)
+ return readl(((void __iomem *)adev->rmmio) + reg);
+ else
+ return venus_mm_rreg_slow(adev, reg);
+}
+static inline void venus_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
+ bool always_indirect)
+{
+ if ((reg < adev->rmmio_size || reg < AMDGPU_MIN_MMIO_SIZE) && !always_indirect)
+ writel(v, ((void __iomem *)adev->rmmio) + reg);
+ else
+ venus_mm_wreg_slow(adev, reg, v);
+}
+
+#define RREG32_VENUS(reg) venus_mm_rreg(adev, (reg), false)
+#define WREG32_VENUS(reg, v) venus_mm_wreg(adev, (reg), (v), false)
+
+static const u32 aux_offset[] =
+{
+ 0x6200 - 0x6200,
+ 0x6250 - 0x6200,
+ 0x62a0 - 0x6200,
+ 0x6300 - 0x6200,
+ 0x6350 - 0x6200,
+ 0x63a0 - 0x6200,
+};
+
+ssize_t
+amdgpu_dp_aux_transfer_native(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
+{
+ struct amdgpu_i2c_chan *chan =
+ container_of(aux, struct amdgpu_i2c_chan, aux);
+ struct drm_device *dev = chan->dev;
+ struct amdgpu_device *adev = dev->dev_private;
+ int ret = 0, i;
+ uint32_t tmp, ack = 0;
+ int instance = chan->rec.i2c_id & 0xf;
+ u8 byte;
+ u8 *buf = msg->buffer;
+ int retry_count = 0;
+ int bytes;
+ int msize;
+ bool is_write = false;
+
+ if (WARN_ON(msg->size > 16))
+ return -E2BIG;
+
+ switch (msg->request & ~DP_AUX_I2C_MOT) {
+ case DP_AUX_NATIVE_WRITE:
+ case DP_AUX_I2C_WRITE:
+ is_write = true;
+ break;
+ case DP_AUX_NATIVE_READ:
+ case DP_AUX_I2C_READ:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* work out two sizes required */
+ msize = 0;
+ bytes = BARE_ADDRESS_SIZE;
+ if (msg->size) {
+ msize = msg->size - 1;
+ bytes++;
+ if (is_write)
+ bytes += msg->size;
+ }
+
+ mutex_lock(&chan->mutex);
+
+ /* switch the pad to aux mode */
+ tmp = RREG32_VENUS(chan->rec.mask_clk_reg);
+ tmp |= (1 << 16);
+ WREG32_VENUS(chan->rec.mask_clk_reg, tmp);
+
+ /* setup AUX control register with correct HPD pin */
+ tmp = RREG32_VENUS(AUX_CONTROL + aux_offset[instance]);
+ tmp &= AUX_HPD_SEL(0x7);
+ tmp |= AUX_HPD_SEL(chan->rec.hpd);
+ tmp |= AUX_EN | AUX_LS_READ_EN;
+
+ WREG32_VENUS(AUX_CONTROL + aux_offset[instance], tmp);
+
+ /* atombios appears to write this twice lets copy it */
+ WREG32_VENUS(AUX_SW_CONTROL + aux_offset[instance],
+ AUX_SW_WR_BYTES(bytes));
+ WREG32_VENUS(AUX_SW_CONTROL + aux_offset[instance],
+ AUX_SW_WR_BYTES(bytes));
+
+ /* write the data header into the registers */
+ /* request, address, msg size */
+ byte = (msg->request << 4) | ((msg->address >> 16) & 0xf);
+ WREG32_VENUS(AUX_SW_DATA + aux_offset[instance],
+ AUX_SW_DATA_MASK(byte) | AUX_SW_AUTOINCREMENT_DISABLE);
+
+ byte = (msg->address >> 8) & 0xff;
+ WREG32_VENUS(AUX_SW_DATA + aux_offset[instance],
+ AUX_SW_DATA_MASK(byte));
+
+ byte = msg->address & 0xff;
+ WREG32_VENUS(AUX_SW_DATA + aux_offset[instance],
+ AUX_SW_DATA_MASK(byte));
+
+ byte = msize;
+ WREG32_VENUS(AUX_SW_DATA + aux_offset[instance],
+ AUX_SW_DATA_MASK(byte));
+
+ /* if we are writing - write the msg buffer */
+ if (is_write) {
+ for (i = 0; i < msg->size; i++) {
+ WREG32_VENUS(AUX_SW_DATA + aux_offset[instance],
+ AUX_SW_DATA_MASK(buf[i]));
+ }
+ }
+
+ /* clear the ACK */
+ WREG32_VENUS(AUX_SW_INTERRUPT_CONTROL + aux_offset[instance], AUX_SW_DONE_ACK);
+
+ /* write the size and GO bits */
+ WREG32_VENUS(AUX_SW_CONTROL + aux_offset[instance],
+ AUX_SW_WR_BYTES(bytes) | AUX_SW_GO);
+
+ /* poll the status registers - TODO irq support */
+ do {
+ tmp = RREG32_VENUS(AUX_SW_STATUS + aux_offset[instance]);
+ if (tmp & AUX_SW_DONE) {
+ break;
+ }
+ usleep_range(100, 200);
+ } while (retry_count++ < 1000);
+
+ if (retry_count >= 1000) {
+ DRM_ERROR("auxch hw never signalled completion, error %08x\n", tmp);
+ ret = -EIO;
+ goto done;
+ }
+
+ if (tmp & AUX_SW_RX_TIMEOUT) {
+ ret = -ETIMEDOUT;
+ goto done;
+ }
+ if (tmp & AUX_RX_ERROR_FLAGS) {
+ DRM_DEBUG_KMS_RATELIMITED("dp_aux_ch flags not zero: %08x\n",
+ tmp);
+ ret = -EIO;
+ goto done;
+ }
+
+ bytes = AUX_SW_REPLY_GET_BYTE_COUNT(tmp);
+ if (bytes) {
+ WREG32_VENUS(AUX_SW_DATA + aux_offset[instance],
+ AUX_SW_DATA_RW | AUX_SW_AUTOINCREMENT_DISABLE);
+
+ tmp = RREG32_VENUS(AUX_SW_DATA + aux_offset[instance]);
+ ack = (tmp >> 8) & 0xff;
+
+ for (i = 0; i < bytes - 1; i++) {
+ tmp = RREG32_VENUS(AUX_SW_DATA + aux_offset[instance]);
+ if (buf)
+ buf[i] = (tmp >> 8) & 0xff;
+ }
+ if (buf)
+ ret = bytes - 1;
+ }
+
+ WREG32_VENUS(AUX_SW_INTERRUPT_CONTROL + aux_offset[instance], AUX_SW_DONE_ACK);
+
+ if (is_write)
+ ret = msg->size;
+done:
+ mutex_unlock(&chan->mutex);
+
+ if (ret >= 0)
+ msg->reply = ack >> 4;
+ return ret;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 8890300766a5..2ac7636ddafb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -180,6 +180,7 @@ int amdgpu_num_kcq = -1;
int amdgpu_smartshift_bias;
int amdgpu_use_xgmi_p2p = 1;
int amdgpu_vcnfw_log;
+int amdgpu_auxch = 0;
static void amdgpu_drv_delayed_reset_work_handler(struct work_struct *work);
@@ -882,6 +883,9 @@ MODULE_PARM_DESC(smu_pptable_id,
"specify pptable id to be used (-1 = auto(default) value, 0 = use pptable from vbios, > 0 = soft pptable id)");
module_param_named(smu_pptable_id, amdgpu_smu_pptable_id, int, 0444);
+MODULE_PARM_DESC(auxch, "Use native auxch experimental support (1 = enable, 0 = disable, -1 = auto)");
+module_param_named(auxch, amdgpu_auxch, int, 0444);
+
/* These devices are not supported by amdgpu.
* They are supported by the mach64, r128, radeon drivers
*/
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
index f80b4838cea1..95fffc110c75 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
@@ -619,5 +619,7 @@ int amdgpu_display_crtc_page_flip_target(struct drm_crtc *crtc,
uint32_t page_flip_flags, uint32_t target,
struct drm_modeset_acquire_ctx *ctx);
extern const struct drm_mode_config_funcs amdgpu_mode_funcs;
+extern ssize_t
+amdgpu_dp_aux_transfer_native(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg);
#endif
diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
index 87c41e0e9b7c..846ecc315665 100644
--- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
@@ -188,7 +188,10 @@ amdgpu_atombios_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *m
void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector)
{
amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd;
- amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer;
+ if (amdgpu_auxch)
+ amdgpu_connector->ddc_bus->aux.transfer = amdgpu_dp_aux_transfer_native;
+ else
+ amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer;
amdgpu_connector->ddc_bus->aux.drm_dev = amdgpu_connector->base.dev;
drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux);
--
2.25.1
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