diff options
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.c | 109 |
1 files changed, 80 insertions, 29 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 cd26161bcc4d..a9061aaf1562 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 @@ -22,6 +22,9 @@ * Authors: AMD * */ + +#include <linux/delay.h> + #include "dce_i2c.h" #include "dce_i2c_hw.h" #include "reg_helper.h" @@ -149,6 +152,36 @@ 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 +192,11 @@ 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)); @@ -268,6 +306,14 @@ static bool setup_engine( struct dce_i2c_hw *dce_i2c_hw) { uint32_t i2c_setup_limit = I2C_SETUP_TIME_LIMIT_DCE; +#if defined(CONFIG_DRM_AMD_DC_DCN2_0) + uint32_t reset_length = 0; +#endif + /* we have checked I2c not used by DMCU, set SW use I2C REQ to 1 to indicate SW using it*/ + REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_USE_I2C_REG_REQ, 1); + + /* we have checked I2c not used by DMCU, set SW use I2C REQ to 1 to indicate SW using it*/ + REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_USE_I2C_REG_REQ, 1); if (dce_i2c_hw->setup_limit != 0) i2c_setup_limit = dce_i2c_hw->setup_limit; @@ -286,33 +332,26 @@ static bool setup_engine( 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); +#if defined(CONFIG_DRM_AMD_DC_DCN2_0) + } else { + reset_length = dce_i2c_hw->send_reset_length; + REG_UPDATE_N(SETUP, 3, + FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_TIME_LIMIT), i2c_setup_limit, + FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_SEND_RESET_LENGTH), reset_length, + FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_ENABLE), 1); +#endif } /* 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); + 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) { @@ -322,8 +361,6 @@ static void release_engine( 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 */ { @@ -343,19 +380,12 @@ static void release_engine( /* 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); + /* Release I2C after reset, so HW or DMCU could use it */ + REG_UPDATE_2(DC_I2C_ARBITRATION, DC_I2C_SW_DONE_USING_I2C_REG, 1, + DC_I2C_SW_USE_I2C_REG_REQ, 0); } -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) @@ -453,6 +483,7 @@ 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); @@ -684,3 +715,23 @@ void dcn1_i2c_hw_construct( dce_i2c_hw->setup_limit = I2C_SETUP_TIME_LIMIT_DCN; } +#if defined(CONFIG_DRM_AMD_DC_DCN2_0) +void dcn2_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) +{ + dcn1_i2c_hw_construct(dce_i2c_hw, + ctx, + engine_id, + regs, + shifts, + masks); + dce_i2c_hw->send_reset_length = I2C_SEND_RESET_LENGTH_9; + if (ctx->dc->debug.scl_reset_length10) + dce_i2c_hw->send_reset_length = I2C_SEND_RESET_LENGTH_10; +} +#endif |