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drm/i915/dsi: refactor dsi get hw state readout 

Make the code easier to read and update. No functional changes.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/04b20a9be6a9481ca2eb2a42cdcdc27358152e5f.1458070700.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2016-03-15 21:51:11 +02:00
parent da20563097
commit 1dcec2f39f
1 changed files with 19 additions and 18 deletions
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37
drivers/gpu/drm/i915/intel_dsi.c
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@ -667,7 +667,7 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
struct drm_device *dev = encoder->base.dev;
enum intel_display_power_domain power_domain;
enum port port;
bool ret;
bool active = false;
DRM_DEBUG_KMS("\n");
@ -675,38 +675,39 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
return false;
ret = false;
/* XXX: this only works for one DSI output */
for_each_dsi_port(port, intel_dsi->ports) {
i915_reg_t ctrl_reg = IS_BROXTON(dev) ?
BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
u32 dpi_enabled, func;
func = I915_READ(MIPI_DSI_FUNC_PRG(port));
dpi_enabled = I915_READ(ctrl_reg) & DPI_ENABLE;
bool enabled = I915_READ(ctrl_reg) & DPI_ENABLE;
/* Due to some hardware limitations on BYT, MIPI Port C DPI
* Enable bit does not get set. To check whether DSI Port C
* was enabled in BIOS, check the Pipe B enable bit
*/
if (IS_VALLEYVIEW(dev) && port == PORT_C)
dpi_enabled = I915_READ(PIPECONF(PIPE_B)) &
PIPECONF_ENABLE;
enabled = I915_READ(PIPECONF(PIPE_B)) & PIPECONF_ENABLE;
if (dpi_enabled || (func & CMD_MODE_DATA_WIDTH_MASK)) {
if (I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY) {
*pipe = port == PORT_A ? PIPE_A : PIPE_B;
ret = true;
goto out;
}
/* Try command mode if video mode not enabled */
if (!enabled) {
u32 tmp = I915_READ(MIPI_DSI_FUNC_PRG(port));
enabled = tmp & CMD_MODE_DATA_WIDTH_MASK;
}
if (!enabled)
continue;
if (!(I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY))
continue;
*pipe = port == PORT_A ? PIPE_A : PIPE_B;
active = true;
break;
}
out:
intel_display_power_put(dev_priv, power_domain);
return ret;
return active;
}
static void intel_dsi_get_config(struct intel_encoder *encoder,