From 9bbf6a5341092e8a9b4e7b02bea6721e29ced9ef Mon Sep 17 00:00:00 2001 From: David Francis Date: Fri, 3 Aug 2018 13:24:28 -0400 Subject: [PATCH] drm/amd/display: Flatten unnecessary i2c functions [Why] The dce_i2c_hw code contained four funtcions that were only called in one place and did not have a clearly delineated purpose. [How] Inline these functions, keeping the same functionality. This is not a functional change. The functions disable_i2c_hw_engine and release_engine_dce_hw were pulled into their respective callers. The most interesting part of this change is the acquire functions. dce_i2c_hw_engine_acquire_engine was pulled into dce_i2c_engine_acquire_hw, and dce_i2c_engine_acquire_hw was pulled into acquire_i2c_hw_engine. Some notes to show that this change is not functional: -Failure conditions in any function resulted in a cascade of calls that ended in a 'return NULL'. Those are replaced with a direct 'return NULL'. -The variable result is the one from dce_i2c_hw_engine_acquire_engine. The boolean result used as part of return logic was removed. -As the second half of dce_i2c_hw_engine_acquire_engine is only executed if that function is returning true and therefore exiting the do-while loop in dce_i2c_engine_acquire_hw, those lines were moved outside of the loop. Signed-off-by: David Francis Acked-by: Leo Li Signed-off-by: Alex Deucher --- .../gpu/drm/amd/display/dc/dce/dce_i2c_hw.c | 111 ++++++------------ 1 file changed, 34 insertions(+), 77 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 2800d3fa49da..40f2d6e0b122 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 @@ -36,12 +36,6 @@ #define FN(reg_name, field_name) \ dce_i2c_hw->shifts->field_name, dce_i2c_hw->masks->field_name -static void disable_i2c_hw_engine( - struct dce_i2c_hw *dce_i2c_hw) -{ - REG_UPDATE_N(SETUP, 1, FN(SETUP, DC_I2C_DDC1_ENABLE), 0); -} - static void execute_transaction( struct dce_i2c_hw *dce_i2c_hw) { @@ -348,60 +342,40 @@ static void release_engine( 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) - disable_i2c_hw_engine(dce_i2c_hw); + REG_UPDATE_N(SETUP, 1, FN(SETUP, DC_I2C_DDC1_ENABLE), 0); } -static void release_engine_dce_hw( +struct dce_i2c_hw *acquire_i2c_hw_engine( struct resource_pool *pool, - struct dce_i2c_hw *dce_i2c_hw) -{ - pool->i2c_hw_buffer_in_use = false; - - release_engine(dce_i2c_hw); - dal_ddc_close(dce_i2c_hw->ddc); - - dce_i2c_hw->ddc = NULL; -} - -bool dce_i2c_hw_engine_acquire_engine( - struct dce_i2c_hw *dce_i2c_hw, struct ddc *ddc) { - + uint32_t counter = 0; enum gpio_result result; uint32_t current_speed; + struct dce_i2c_hw *dce_i2c_hw = NULL; - result = dal_ddc_open(ddc, GPIO_MODE_HARDWARE, - GPIO_DDC_CONFIG_TYPE_MODE_I2C); - - if (result != GPIO_RESULT_OK) - return false; - - dce_i2c_hw->ddc = ddc; - - - current_speed = get_speed(dce_i2c_hw); + if (!ddc) + return NULL; - if (current_speed) - dce_i2c_hw->original_speed = current_speed; + if (ddc->hw_info.hw_supported) { + enum gpio_ddc_line line = dal_ddc_get_line(ddc); - return true; -} + if (line < pool->pipe_count) + dce_i2c_hw = pool->hw_i2cs[line]; + } -bool dce_i2c_engine_acquire_hw( - struct dce_i2c_hw *dce_i2c_hw, - struct ddc *ddc_handle) -{ + if (!dce_i2c_hw) + return NULL; - uint32_t counter = 0; - bool result; + if (pool->i2c_hw_buffer_in_use) + return NULL; do { - result = dce_i2c_hw_engine_acquire_engine( - dce_i2c_hw, ddc_handle); + result = dal_ddc_open(ddc, GPIO_MODE_HARDWARE, + GPIO_DDC_CONFIG_TYPE_MODE_I2C); - if (result) + if (result == GPIO_RESULT_OK) break; /* i2c_engine is busy by VBios, lets wait and retry */ @@ -411,45 +385,23 @@ bool dce_i2c_engine_acquire_hw( ++counter; } while (counter < 2); - if (result) { - if (!setup_engine(dce_i2c_hw)) { - release_engine(dce_i2c_hw); - result = false; - } - } - - return result; -} - -struct dce_i2c_hw *acquire_i2c_hw_engine( - struct resource_pool *pool, - struct ddc *ddc) -{ - - struct dce_i2c_hw *engine = NULL; - - if (!ddc) + if (result != GPIO_RESULT_OK) return NULL; - if (ddc->hw_info.hw_supported) { - enum gpio_ddc_line line = dal_ddc_get_line(ddc); - - if (line < pool->pipe_count) - engine = pool->hw_i2cs[line]; - } + dce_i2c_hw->ddc = ddc; - if (!engine) - return NULL; + current_speed = get_speed(dce_i2c_hw); + if (current_speed) + dce_i2c_hw->original_speed = current_speed; - if (!pool->i2c_hw_buffer_in_use && - dce_i2c_engine_acquire_hw(engine, ddc)) { - pool->i2c_hw_buffer_in_use = true; - return engine; + if (!setup_engine(dce_i2c_hw)) { + release_engine(dce_i2c_hw); + return NULL; } - - 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( @@ -619,7 +571,12 @@ bool dce_i2c_submit_command_hw( ++index_of_payload; } - release_engine_dce_hw(pool, dce_i2c_hw); + 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; } -- 2.30.2