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path: root/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
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Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c')
-rw-r--r--drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c676
1 files changed, 676 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
new file mode 100644
index 000000000000..40f2d6e0b122
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
@@ -0,0 +1,676 @@
+/*
+ * Copyright 2018 Advanced Micro Devices, 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: AMD
+ *
+ */
+#include "dce_i2c.h"
+#include "dce_i2c_hw.h"
+#include "reg_helper.h"
+#include "include/gpio_service_interface.h"
+
+#define CTX \
+ dce_i2c_hw->ctx
+#define REG(reg)\
+ dce_i2c_hw->regs->reg
+
+#undef FN
+#define FN(reg_name, field_name) \
+ dce_i2c_hw->shifts->field_name, dce_i2c_hw->masks->field_name
+
+static void execute_transaction(
+ struct dce_i2c_hw *dce_i2c_hw)
+{
+ REG_UPDATE_N(SETUP, 5,
+ FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_DATA_DRIVE_EN), 0,
+ FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_CLK_DRIVE_EN), 0,
+ FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_DATA_DRIVE_SEL), 0,
+ FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_INTRA_TRANSACTION_DELAY), 0,
+ FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_INTRA_BYTE_DELAY), 0);
+
+
+ REG_UPDATE_5(DC_I2C_CONTROL,
+ DC_I2C_SOFT_RESET, 0,
+ DC_I2C_SW_STATUS_RESET, 0,
+ DC_I2C_SEND_RESET, 0,
+ DC_I2C_GO, 0,
+ DC_I2C_TRANSACTION_COUNT, dce_i2c_hw->transaction_count - 1);
+
+ /* start I2C transfer */
+ REG_UPDATE(DC_I2C_CONTROL, DC_I2C_GO, 1);
+
+ /* all transactions were executed and HW buffer became empty
+ * (even though it actually happens when status becomes DONE)
+ */
+ dce_i2c_hw->transaction_count = 0;
+ dce_i2c_hw->buffer_used_bytes = 0;
+}
+
+static enum i2c_channel_operation_result get_channel_status(
+ struct dce_i2c_hw *dce_i2c_hw,
+ uint8_t *returned_bytes)
+{
+ uint32_t i2c_sw_status = 0;
+ uint32_t value =
+ REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status);
+ if (i2c_sw_status == DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_SW)
+ return I2C_CHANNEL_OPERATION_ENGINE_BUSY;
+ else if (value & dce_i2c_hw->masks->DC_I2C_SW_STOPPED_ON_NACK)
+ return I2C_CHANNEL_OPERATION_NO_RESPONSE;
+ else if (value & dce_i2c_hw->masks->DC_I2C_SW_TIMEOUT)
+ return I2C_CHANNEL_OPERATION_TIMEOUT;
+ else if (value & dce_i2c_hw->masks->DC_I2C_SW_ABORTED)
+ return I2C_CHANNEL_OPERATION_FAILED;
+ else if (value & dce_i2c_hw->masks->DC_I2C_SW_DONE)
+ return I2C_CHANNEL_OPERATION_SUCCEEDED;
+
+ /*
+ * this is the case when HW used for communication, I2C_SW_STATUS
+ * could be zero
+ */
+ return I2C_CHANNEL_OPERATION_SUCCEEDED;
+}
+
+static uint32_t get_hw_buffer_available_size(
+ const struct dce_i2c_hw *dce_i2c_hw)
+{
+ return dce_i2c_hw->buffer_size -
+ dce_i2c_hw->buffer_used_bytes;
+}
+
+uint32_t get_reference_clock(
+ struct dc_bios *bios)
+{
+ struct dc_firmware_info info = { { 0 } };
+
+ if (bios->funcs->get_firmware_info(bios, &info) != BP_RESULT_OK)
+ return 0;
+
+ return info.pll_info.crystal_frequency;
+}
+
+static uint32_t get_speed(
+ const struct dce_i2c_hw *dce_i2c_hw)
+{
+ uint32_t pre_scale = 0;
+
+ REG_GET(SPEED, DC_I2C_DDC1_PRESCALE, &pre_scale);
+
+ /* [anaumov] it seems following is unnecessary */
+ /*ASSERT(value.bits.DC_I2C_DDC1_PRESCALE);*/
+ return pre_scale ?
+ dce_i2c_hw->reference_frequency / pre_scale :
+ dce_i2c_hw->default_speed;
+}
+
+static void process_channel_reply(
+ struct dce_i2c_hw *dce_i2c_hw,
+ struct i2c_payload *reply)
+{
+ uint32_t length = reply->length;
+ uint8_t *buffer = reply->data;
+
+ REG_SET_3(DC_I2C_DATA, 0,
+ DC_I2C_INDEX, dce_i2c_hw->buffer_used_write,
+ DC_I2C_DATA_RW, 1,
+ DC_I2C_INDEX_WRITE, 1);
+
+ while (length) {
+ /* after reading the status,
+ * if the I2C operation executed successfully
+ * (i.e. DC_I2C_STATUS_DONE = 1) then the I2C controller
+ * should read data bytes from I2C circular data buffer
+ */
+
+ uint32_t i2c_data;
+
+ REG_GET(DC_I2C_DATA, DC_I2C_DATA, &i2c_data);
+ *buffer++ = i2c_data;
+
+ --length;
+ }
+}
+
+static bool process_transaction(
+ struct dce_i2c_hw *dce_i2c_hw,
+ struct i2c_request_transaction_data *request)
+{
+ uint32_t length = request->length;
+ uint8_t *buffer = request->data;
+
+ bool last_transaction = false;
+ uint32_t value = 0;
+
+ last_transaction = ((dce_i2c_hw->transaction_count == 3) ||
+ (request->action == DCE_I2C_TRANSACTION_ACTION_I2C_WRITE) ||
+ (request->action & DCE_I2C_TRANSACTION_ACTION_I2C_READ));
+
+
+ switch (dce_i2c_hw->transaction_count) {
+ case 0:
+ REG_UPDATE_5(DC_I2C_TRANSACTION0,
+ DC_I2C_STOP_ON_NACK0, 1,
+ DC_I2C_START0, 1,
+ DC_I2C_RW0, 0 != (request->action & DCE_I2C_TRANSACTION_ACTION_I2C_READ),
+ DC_I2C_COUNT0, length,
+ DC_I2C_STOP0, last_transaction ? 1 : 0);
+ break;
+ case 1:
+ REG_UPDATE_5(DC_I2C_TRANSACTION1,
+ DC_I2C_STOP_ON_NACK0, 1,
+ DC_I2C_START0, 1,
+ DC_I2C_RW0, 0 != (request->action & DCE_I2C_TRANSACTION_ACTION_I2C_READ),
+ DC_I2C_COUNT0, length,
+ DC_I2C_STOP0, last_transaction ? 1 : 0);
+ break;
+ case 2:
+ REG_UPDATE_5(DC_I2C_TRANSACTION2,
+ DC_I2C_STOP_ON_NACK0, 1,
+ DC_I2C_START0, 1,
+ DC_I2C_RW0, 0 != (request->action & DCE_I2C_TRANSACTION_ACTION_I2C_READ),
+ DC_I2C_COUNT0, length,
+ DC_I2C_STOP0, last_transaction ? 1 : 0);
+ break;
+ case 3:
+ REG_UPDATE_5(DC_I2C_TRANSACTION3,
+ DC_I2C_STOP_ON_NACK0, 1,
+ DC_I2C_START0, 1,
+ DC_I2C_RW0, 0 != (request->action & DCE_I2C_TRANSACTION_ACTION_I2C_READ),
+ DC_I2C_COUNT0, length,
+ DC_I2C_STOP0, last_transaction ? 1 : 0);
+ break;
+ default:
+ /* TODO Warning ? */
+ break;
+ }
+
+ /* Write the I2C address and I2C data
+ * into the hardware circular buffer, one byte per entry.
+ * As an example, the 7-bit I2C slave address for CRT monitor
+ * for reading DDC/EDID information is 0b1010001.
+ * For an I2C send operation, the LSB must be programmed to 0;
+ * for I2C receive operation, the LSB must be programmed to 1.
+ */
+ if (dce_i2c_hw->transaction_count == 0) {
+ value = REG_SET_4(DC_I2C_DATA, 0,
+ DC_I2C_DATA_RW, false,
+ DC_I2C_DATA, request->address,
+ DC_I2C_INDEX, 0,
+ DC_I2C_INDEX_WRITE, 1);
+ dce_i2c_hw->buffer_used_write = 0;
+ } else
+ value = REG_SET_2(DC_I2C_DATA, 0,
+ DC_I2C_DATA_RW, false,
+ DC_I2C_DATA, request->address);
+
+ dce_i2c_hw->buffer_used_write++;
+
+ if (!(request->action & DCE_I2C_TRANSACTION_ACTION_I2C_READ)) {
+ while (length) {
+ REG_SET_2(DC_I2C_DATA, value,
+ DC_I2C_INDEX_WRITE, 0,
+ DC_I2C_DATA, *buffer++);
+ dce_i2c_hw->buffer_used_write++;
+ --length;
+ }
+ }
+
+ ++dce_i2c_hw->transaction_count;
+ dce_i2c_hw->buffer_used_bytes += length + 1;
+
+ return last_transaction;
+}
+
+static inline void reset_hw_engine(struct dce_i2c_hw *dce_i2c_hw)
+{
+ REG_UPDATE_2(DC_I2C_CONTROL,
+ DC_I2C_SW_STATUS_RESET, 1,
+ DC_I2C_SW_STATUS_RESET, 1);
+}
+
+static void set_speed(
+ struct dce_i2c_hw *dce_i2c_hw,
+ uint32_t speed)
+{
+
+ if (speed) {
+ if (dce_i2c_hw->masks->DC_I2C_DDC1_START_STOP_TIMING_CNTL)
+ REG_UPDATE_N(SPEED, 3,
+ FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_PRESCALE), dce_i2c_hw->reference_frequency / speed,
+ FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_THRESHOLD), 2,
+ FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_START_STOP_TIMING_CNTL), speed > 50 ? 2:1);
+ else
+ REG_UPDATE_N(SPEED, 2,
+ FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_PRESCALE), dce_i2c_hw->reference_frequency / speed,
+ FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_THRESHOLD), 2);
+ }
+}
+
+static bool setup_engine(
+ struct dce_i2c_hw *dce_i2c_hw)
+{
+ uint32_t i2c_setup_limit = I2C_SETUP_TIME_LIMIT_DCE;
+
+ if (dce_i2c_hw->setup_limit != 0)
+ i2c_setup_limit = dce_i2c_hw->setup_limit;
+ /* Program pin select */
+ REG_UPDATE_6(DC_I2C_CONTROL,
+ DC_I2C_GO, 0,
+ DC_I2C_SOFT_RESET, 0,
+ DC_I2C_SEND_RESET, 0,
+ DC_I2C_SW_STATUS_RESET, 1,
+ DC_I2C_TRANSACTION_COUNT, 0,
+ DC_I2C_DDC_SELECT, dce_i2c_hw->engine_id);
+
+ /* Program time limit */
+ if (dce_i2c_hw->send_reset_length == 0) {
+ /*pre-dcn*/
+ REG_UPDATE_N(SETUP, 2,
+ FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_TIME_LIMIT), i2c_setup_limit,
+ FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_ENABLE), 1);
+ }
+ /* Program HW priority
+ * set to High - interrupt software I2C at any time
+ * Enable restart of SW I2C that was interrupted by HW
+ * disable queuing of software while I2C is in use by HW
+ */
+ REG_UPDATE_2(DC_I2C_ARBITRATION,
+ DC_I2C_NO_QUEUED_SW_GO, 0,
+ DC_I2C_SW_PRIORITY, DC_I2C_ARBITRATION__DC_I2C_SW_PRIORITY_NORMAL);
+
+ return true;
+}
+
+static bool is_hw_busy(struct dce_i2c_hw *dce_i2c_hw)
+{
+ uint32_t i2c_sw_status = 0;
+
+ REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status);
+ if (i2c_sw_status == DC_I2C_STATUS__DC_I2C_STATUS_IDLE)
+ return false;
+
+ reset_hw_engine(dce_i2c_hw);
+
+ REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status);
+ return i2c_sw_status != DC_I2C_STATUS__DC_I2C_STATUS_IDLE;
+}
+
+static void release_engine(
+ struct dce_i2c_hw *dce_i2c_hw)
+{
+ bool safe_to_reset;
+
+ /* Restore original HW engine speed */
+
+ set_speed(dce_i2c_hw, dce_i2c_hw->original_speed);
+
+ /* Release I2C */
+ REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_DONE_USING_I2C_REG, 1);
+
+ /* Reset HW engine */
+ {
+ uint32_t i2c_sw_status = 0;
+
+ REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status);
+ /* if used by SW, safe to reset */
+ safe_to_reset = (i2c_sw_status == 1);
+ }
+
+ if (safe_to_reset)
+ REG_UPDATE_2(DC_I2C_CONTROL,
+ DC_I2C_SOFT_RESET, 1,
+ DC_I2C_SW_STATUS_RESET, 1);
+ else
+ REG_UPDATE(DC_I2C_CONTROL, DC_I2C_SW_STATUS_RESET, 1);
+ /* HW I2c engine - clock gating feature */
+ if (!dce_i2c_hw->engine_keep_power_up_count)
+ REG_UPDATE_N(SETUP, 1, FN(SETUP, DC_I2C_DDC1_ENABLE), 0);
+
+}
+
+struct dce_i2c_hw *acquire_i2c_hw_engine(
+ struct resource_pool *pool,
+ struct ddc *ddc)
+{
+ uint32_t counter = 0;
+ enum gpio_result result;
+ uint32_t current_speed;
+ struct dce_i2c_hw *dce_i2c_hw = NULL;
+
+ if (!ddc)
+ return NULL;
+
+ if (ddc->hw_info.hw_supported) {
+ enum gpio_ddc_line line = dal_ddc_get_line(ddc);
+
+ if (line < pool->pipe_count)
+ dce_i2c_hw = pool->hw_i2cs[line];
+ }
+
+ if (!dce_i2c_hw)
+ return NULL;
+
+ if (pool->i2c_hw_buffer_in_use)
+ return NULL;
+
+ do {
+ result = dal_ddc_open(ddc, GPIO_MODE_HARDWARE,
+ GPIO_DDC_CONFIG_TYPE_MODE_I2C);
+
+ if (result == GPIO_RESULT_OK)
+ break;
+
+ /* i2c_engine is busy by VBios, lets wait and retry */
+
+ udelay(10);
+
+ ++counter;
+ } while (counter < 2);
+
+ if (result != GPIO_RESULT_OK)
+ return NULL;
+
+ dce_i2c_hw->ddc = ddc;
+
+ current_speed = get_speed(dce_i2c_hw);
+
+ if (current_speed)
+ dce_i2c_hw->original_speed = current_speed;
+
+ if (!setup_engine(dce_i2c_hw)) {
+ release_engine(dce_i2c_hw);
+ return NULL;
+ }
+
+ pool->i2c_hw_buffer_in_use = true;
+ return dce_i2c_hw;
+}
+
+enum i2c_channel_operation_result dce_i2c_hw_engine_wait_on_operation_result(
+ struct dce_i2c_hw *dce_i2c_hw,
+ uint32_t timeout,
+ enum i2c_channel_operation_result expected_result)
+{
+ enum i2c_channel_operation_result result;
+ uint32_t i = 0;
+
+ if (!timeout)
+ return I2C_CHANNEL_OPERATION_SUCCEEDED;
+
+ do {
+
+ result = get_channel_status(
+ dce_i2c_hw, NULL);
+
+ if (result != expected_result)
+ break;
+
+ udelay(1);
+
+ ++i;
+ } while (i < timeout);
+ return result;
+}
+
+static void submit_channel_request_hw(
+ struct dce_i2c_hw *dce_i2c_hw,
+ struct i2c_request_transaction_data *request)
+{
+ request->status = I2C_CHANNEL_OPERATION_SUCCEEDED;
+
+ if (!process_transaction(dce_i2c_hw, request))
+ return;
+
+ if (is_hw_busy(dce_i2c_hw)) {
+ request->status = I2C_CHANNEL_OPERATION_ENGINE_BUSY;
+ return;
+ }
+
+ execute_transaction(dce_i2c_hw);
+
+
+}
+
+static uint32_t get_transaction_timeout_hw(
+ const struct dce_i2c_hw *dce_i2c_hw,
+ uint32_t length)
+{
+
+ uint32_t speed = get_speed(dce_i2c_hw);
+
+
+
+ uint32_t period_timeout;
+ uint32_t num_of_clock_stretches;
+
+ if (!speed)
+ return 0;
+
+ period_timeout = (1000 * TRANSACTION_TIMEOUT_IN_I2C_CLOCKS) / speed;
+
+ num_of_clock_stretches = 1 + (length << 3) + 1;
+ num_of_clock_stretches +=
+ (dce_i2c_hw->buffer_used_bytes << 3) +
+ (dce_i2c_hw->transaction_count << 1);
+
+ return period_timeout * num_of_clock_stretches;
+}
+
+bool dce_i2c_hw_engine_submit_payload(
+ struct dce_i2c_hw *dce_i2c_hw,
+ struct i2c_payload *payload,
+ bool middle_of_transaction)
+{
+
+ struct i2c_request_transaction_data request;
+
+ uint32_t transaction_timeout;
+
+ enum i2c_channel_operation_result operation_result;
+
+ bool result = false;
+
+ /* We need following:
+ * transaction length will not exceed
+ * the number of free bytes in HW buffer (minus one for address)
+ */
+
+ if (payload->length >=
+ get_hw_buffer_available_size(dce_i2c_hw)) {
+ return false;
+ }
+
+ if (!payload->write)
+ request.action = middle_of_transaction ?
+ DCE_I2C_TRANSACTION_ACTION_I2C_READ_MOT :
+ DCE_I2C_TRANSACTION_ACTION_I2C_READ;
+ else
+ request.action = middle_of_transaction ?
+ DCE_I2C_TRANSACTION_ACTION_I2C_WRITE_MOT :
+ DCE_I2C_TRANSACTION_ACTION_I2C_WRITE;
+
+
+ request.address = (uint8_t) ((payload->address << 1) | !payload->write);
+ request.length = payload->length;
+ request.data = payload->data;
+
+ /* obtain timeout value before submitting request */
+
+ transaction_timeout = get_transaction_timeout_hw(
+ dce_i2c_hw, payload->length + 1);
+
+ submit_channel_request_hw(
+ dce_i2c_hw, &request);
+
+ if ((request.status == I2C_CHANNEL_OPERATION_FAILED) ||
+ (request.status == I2C_CHANNEL_OPERATION_ENGINE_BUSY))
+ return false;
+
+ /* wait until transaction proceed */
+
+ operation_result = dce_i2c_hw_engine_wait_on_operation_result(
+ dce_i2c_hw,
+ transaction_timeout,
+ I2C_CHANNEL_OPERATION_ENGINE_BUSY);
+
+ /* update transaction status */
+
+ if (operation_result == I2C_CHANNEL_OPERATION_SUCCEEDED)
+ result = true;
+
+ if (result && (!payload->write))
+ process_channel_reply(dce_i2c_hw, payload);
+
+ return result;
+}
+
+bool dce_i2c_submit_command_hw(
+ struct resource_pool *pool,
+ struct ddc *ddc,
+ struct i2c_command *cmd,
+ struct dce_i2c_hw *dce_i2c_hw)
+{
+ uint8_t index_of_payload = 0;
+ bool result;
+
+ set_speed(dce_i2c_hw, cmd->speed);
+
+ result = true;
+
+ while (index_of_payload < cmd->number_of_payloads) {
+ bool mot = (index_of_payload != cmd->number_of_payloads - 1);
+
+ struct i2c_payload *payload = cmd->payloads + index_of_payload;
+
+ if (!dce_i2c_hw_engine_submit_payload(
+ dce_i2c_hw, payload, mot)) {
+ result = false;
+ break;
+ }
+
+
+
+ ++index_of_payload;
+ }
+
+ pool->i2c_hw_buffer_in_use = false;
+
+ release_engine(dce_i2c_hw);
+ dal_ddc_close(dce_i2c_hw->ddc);
+
+ dce_i2c_hw->ddc = NULL;
+
+ return result;
+}
+
+void dce_i2c_hw_construct(
+ struct dce_i2c_hw *dce_i2c_hw,
+ struct dc_context *ctx,
+ uint32_t engine_id,
+ const struct dce_i2c_registers *regs,
+ const struct dce_i2c_shift *shifts,
+ const struct dce_i2c_mask *masks)
+{
+ dce_i2c_hw->ctx = ctx;
+ dce_i2c_hw->engine_id = engine_id;
+ dce_i2c_hw->reference_frequency = get_reference_clock(ctx->dc_bios) >> 1;
+ dce_i2c_hw->regs = regs;
+ dce_i2c_hw->shifts = shifts;
+ dce_i2c_hw->masks = masks;
+ dce_i2c_hw->buffer_used_bytes = 0;
+ dce_i2c_hw->transaction_count = 0;
+ dce_i2c_hw->engine_keep_power_up_count = 1;
+ dce_i2c_hw->original_speed = DEFAULT_I2C_HW_SPEED;
+ dce_i2c_hw->default_speed = DEFAULT_I2C_HW_SPEED;
+ dce_i2c_hw->send_reset_length = 0;
+ dce_i2c_hw->setup_limit = I2C_SETUP_TIME_LIMIT_DCE;
+ dce_i2c_hw->buffer_size = I2C_HW_BUFFER_SIZE_DCE;
+}
+
+void dce100_i2c_hw_construct(
+ struct dce_i2c_hw *dce_i2c_hw,
+ struct dc_context *ctx,
+ uint32_t engine_id,
+ const struct dce_i2c_registers *regs,
+ const struct dce_i2c_shift *shifts,
+ const struct dce_i2c_mask *masks)
+{
+
+ uint32_t xtal_ref_div = 0;
+
+ dce_i2c_hw_construct(dce_i2c_hw,
+ ctx,
+ engine_id,
+ regs,
+ shifts,
+ masks);
+ dce_i2c_hw->buffer_size = I2C_HW_BUFFER_SIZE_DCE100;
+
+ REG_GET(MICROSECOND_TIME_BASE_DIV, XTAL_REF_DIV, &xtal_ref_div);
+
+ if (xtal_ref_div == 0)
+ xtal_ref_div = 2;
+
+ /*Calculating Reference Clock by divding original frequency by
+ * XTAL_REF_DIV.
+ * At upper level, uint32_t reference_frequency =
+ * dal_dce_i2c_get_reference_clock(as) >> 1
+ * which already divided by 2. So we need x2 to get original
+ * reference clock from ppll_info
+ */
+ dce_i2c_hw->reference_frequency =
+ (dce_i2c_hw->reference_frequency * 2) / xtal_ref_div;
+}
+
+void dce112_i2c_hw_construct(
+ struct dce_i2c_hw *dce_i2c_hw,
+ struct dc_context *ctx,
+ uint32_t engine_id,
+ const struct dce_i2c_registers *regs,
+ const struct dce_i2c_shift *shifts,
+ const struct dce_i2c_mask *masks)
+{
+ dce100_i2c_hw_construct(dce_i2c_hw,
+ ctx,
+ engine_id,
+ regs,
+ shifts,
+ masks);
+ dce_i2c_hw->default_speed = DEFAULT_I2C_HW_SPEED_100KHZ;
+}
+
+void dcn1_i2c_hw_construct(
+ struct dce_i2c_hw *dce_i2c_hw,
+ struct dc_context *ctx,
+ uint32_t engine_id,
+ const struct dce_i2c_registers *regs,
+ const struct dce_i2c_shift *shifts,
+ const struct dce_i2c_mask *masks)
+{
+ dce112_i2c_hw_construct(dce_i2c_hw,
+ ctx,
+ engine_id,
+ regs,
+ shifts,
+ masks);
+ dce_i2c_hw->setup_limit = I2C_SETUP_TIME_LIMIT_DCN;
+}
+
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.