From: Derek Lai <derek....@amd.com>
1. Add i2c_hw_Status check to make sure when HW i2c is in use.
2. Don't reset HW engine in is_hw_busy() and instead do this in
process_transaction() because SW i2c does not check if hw i2c is in use
Signed-off-by: Derek Lai <derek....@amd.com>
Reviewed-by: Charlene Liu <charlene....@amd.com>
Acked-by: Bhawanpreet Lakha <bhawanpreet.la...@amd.com>
---
.../gpu/drm/amd/display/dc/dce/dce_i2c_hw.c | 65 +++++++++++--------
.../gpu/drm/amd/display/dc/dce/dce_i2c_hw.h | 5 ++
2 files changed, 43 insertions(+), 27 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
index 526aab438374..7f2460caa2a6 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
@@ -149,6 +149,36 @@ static void process_channel_reply(
}
}
+static bool is_engine_available(struct dce_i2c_hw *dce_i2c_hw)
+{
+ unsigned int arbitrate;
+ unsigned int i2c_hw_status;
+
+ REG_GET(HW_STATUS, DC_I2C_DDC1_HW_STATUS, &i2c_hw_status);
+ if (i2c_hw_status == DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_HW)
+ return false;
+
+ REG_GET(DC_I2C_ARBITRATION, DC_I2C_REG_RW_CNTL_STATUS, &arbitrate);
+ if (arbitrate == DC_I2C_REG_RW_CNTL_STATUS_DMCU_ONLY)
+ return false;
+
+ 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;
+
+ if (is_engine_available(dce_i2c_hw))
+ return false;
+
+ return true;
+}
+
static bool process_transaction(
struct dce_i2c_hw *dce_i2c_hw,
struct i2c_request_transaction_data *request)
@@ -159,6 +189,11 @@ static bool process_transaction(
bool last_transaction = false;
uint32_t value = 0;
+ if (is_hw_busy(dce_i2c_hw)) {
+ request->status = I2C_CHANNEL_OPERATION_ENGINE_BUSY;
+ return false;
+ }
+
last_transaction = ((dce_i2c_hw->transaction_count == 3) ||
(request->action ==
DCE_I2C_TRANSACTION_ACTION_I2C_WRITE) ||
(request->action &
DCE_I2C_TRANSACTION_ACTION_I2C_READ));
@@ -294,27 +329,12 @@ static bool setup_engine(
* 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);
+ REG_UPDATE(DC_I2C_ARBITRATION,
+ DC_I2C_NO_QUEUED_SW_GO, 0);
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)
{
@@ -349,16 +369,6 @@ static void release_engine(
}
-static bool is_engine_available(struct dce_i2c_hw *dce_i2c_hw)
-{
- unsigned int arbitrate;
-
- REG_GET(DC_I2C_ARBITRATION, DC_I2C_REG_RW_CNTL_STATUS, &arbitrate);
- if (arbitrate == DC_I2C_REG_RW_CNTL_STATUS_DMCU_ONLY)
- return false;
- return true;
-}
-
struct dce_i2c_hw *acquire_i2c_hw_engine(
struct resource_pool *pool,
struct ddc *ddc)
@@ -456,6 +466,7 @@ static void submit_channel_request_hw(
request->status = I2C_CHANNEL_OPERATION_ENGINE_BUSY;
return;
}
+ reset_hw_engine(dce_i2c_hw);
execute_transaction(dce_i2c_hw);
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h
b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h
index f718e3d396f2..a633632f625b 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h
@@ -84,6 +84,7 @@ enum {
#define I2C_HW_ENGINE_COMMON_REG_LIST(id)\
SRI(SETUP, DC_I2C_DDC, id),\
SRI(SPEED, DC_I2C_DDC, id),\
+ SRI(HW_STATUS, DC_I2C_DDC, id),\
SR(DC_I2C_ARBITRATION),\
SR(DC_I2C_CONTROL),\
SR(DC_I2C_SW_STATUS),\
@@ -105,6 +106,7 @@ enum {
I2C_SF(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_DATA_DRIVE_SEL, mask_sh),\
I2C_SF(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_INTRA_TRANSACTION_DELAY,
mask_sh),\
I2C_SF(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_INTRA_BYTE_DELAY, mask_sh),\
+ I2C_SF(DC_I2C_DDC1_HW_STATUS, DC_I2C_DDC1_HW_STATUS, mask_sh),\
I2C_SF(DC_I2C_ARBITRATION, DC_I2C_SW_USE_I2C_REG_REQ, mask_sh),\
I2C_SF(DC_I2C_ARBITRATION, DC_I2C_SW_DONE_USING_I2C_REG, mask_sh),\
I2C_SF(DC_I2C_ARBITRATION, DC_I2C_NO_QUEUED_SW_GO, mask_sh),\
@@ -146,6 +148,7 @@ struct dce_i2c_shift {
uint8_t DC_I2C_DDC1_DATA_DRIVE_SEL;
uint8_t DC_I2C_DDC1_INTRA_TRANSACTION_DELAY;
uint8_t DC_I2C_DDC1_INTRA_BYTE_DELAY;
+ uint8_t DC_I2C_DDC1_HW_STATUS;
uint8_t DC_I2C_SW_DONE_USING_I2C_REG;
uint8_t DC_I2C_SW_USE_I2C_REG_REQ;
uint8_t DC_I2C_NO_QUEUED_SW_GO;
@@ -185,6 +188,7 @@ struct dce_i2c_mask {
uint32_t DC_I2C_DDC1_DATA_DRIVE_SEL;
uint32_t DC_I2C_DDC1_INTRA_TRANSACTION_DELAY;
uint32_t DC_I2C_DDC1_INTRA_BYTE_DELAY;
+ uint32_t DC_I2C_DDC1_HW_STATUS;
uint32_t DC_I2C_SW_DONE_USING_I2C_REG;
uint32_t DC_I2C_SW_USE_I2C_REG_REQ;
uint32_t DC_I2C_NO_QUEUED_SW_GO;
@@ -219,6 +223,7 @@ struct dce_i2c_mask {
struct dce_i2c_registers {
uint32_t SETUP;
uint32_t SPEED;
+ uint32_t HW_STATUS;
uint32_t DC_I2C_ARBITRATION;
uint32_t DC_I2C_CONTROL;
uint32_t DC_I2C_SW_STATUS;
--
2.17.1
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