forked from Minki/linux
drm: Helper for lspcon in drm_dp_dual_mode
This patch adds lspcon support in dp_dual_mode helper. lspcon is essentially a dp->hdmi dongle with dual personality. LS mode: It works as a passive dongle, by level shifting DP++ signals to HDMI signals, in LS mode. PCON mode: It works as a protocol converter active dongle in pcon mode, by converting DP++ outputs to HDMI 2.0 outputs. This patch adds support for lspcon detection and mode set switch operations, as a dp dual mode dongle. v2: Addressed review comments from Ville - add adaptor id for lspcon devices (0x08), use it to identify lspcon - change function names old: drm_lspcon_get_current_mode/drm_lspcon_change_mode new: drm_lspcon_get_mode/drm_lspcon_set_mode - change drm_lspcon_get_mode type to int, to match drm_dp_dual_mode_get_tmds_output - change 'err' to 'ret' to match the rest of the functions - remove pointless typecasting during call to dual_mode_read - fix the but while setting value of data, while writing lspcon mode - fix indentation - change mdelay(10) -> msleep(10) - return ETIMEDOUT instead of EFAULT, when lspcon mode change times out - Add an empty line to separate std regs macros and lspcon regs macros Indent bit definition v3: Addressed review comments from Rodrigo - change macro name from DP_DUAL_MODE_TYPE_LSPCON to DP_DUAL_MODE_TYPE_HAS_DPCD for better readability - change macro name from DP_DUAL_MODE_LSPCON_MODE_PCON to DP_DUAL_MODE_LSPCON_MODE_PCON for better readability - add comment for MCA specific offsets like 0x40 and 0x41 - remove DP_DUAL_MODE_REV_TYPE2 check while checking lspcon adapter id v4: Addressed review comments from Ville - Fixed indentation at few places - s/current_mode/mode - s/reqd_mode/mode - remove unnecessary void* cast - remove drm_edid.h from includes - Add a comment for _HAS_DPCD - Fix enum description, for lspcon_mode. v5: Rebase v6: Rebase Signed-off-by: Shashank Sharma <shashank.sharma@intel.com> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Acked-by: Dave Airlie <airlied@gmail.com> Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1476720277-16298-1-git-send-email-shashank.sharma@intel.com
This commit is contained in:
Shashank Sharma
Jani Nikula
parent
1140f9ed05
commit
056996b956
@ -148,6 +148,14 @@ static bool is_type2_adaptor(uint8_t adaptor_id)
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DP_DUAL_MODE_REV_TYPE2);
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}
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bool is_lspcon_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN],
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const uint8_t adaptor_id)
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{
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return is_hdmi_adaptor(hdmi_id) &&
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(adaptor_id == (DP_DUAL_MODE_TYPE_TYPE2 |
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DP_DUAL_MODE_TYPE_HAS_DPCD));
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}
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/**
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* drm_dp_dual_mode_detect - Identify the DP dual mode adaptor
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* @adapter: I2C adapter for the DDC bus
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@ -203,6 +211,8 @@ enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter)
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ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_ADAPTOR_ID,
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&adaptor_id, sizeof(adaptor_id));
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if (ret == 0) {
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if (is_lspcon_adaptor(hdmi_id, adaptor_id))
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return DRM_DP_DUAL_MODE_LSPCON;
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if (is_type2_adaptor(adaptor_id)) {
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if (is_hdmi_adaptor(hdmi_id))
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return DRM_DP_DUAL_MODE_TYPE2_HDMI;
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@ -364,3 +374,96 @@ const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type)
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}
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}
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EXPORT_SYMBOL(drm_dp_get_dual_mode_type_name);
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/**
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* drm_lspcon_get_mode: Get LSPCON's current mode of operation by
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* by reading offset (0x80, 0x41)
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* @i2c_adapter: I2C-over-aux adapter
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* @current_mode: out vaiable, current lspcon mode of operation
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*
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* Returns:
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* 0 on success, sets the current_mode value to appropriate mode
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* -error on failure
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*/
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int drm_lspcon_get_mode(struct i2c_adapter *adapter,
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enum drm_lspcon_mode *mode)
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{
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u8 data;
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int ret = 0;
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if (!mode) {
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DRM_ERROR("NULL input\n");
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return -EINVAL;
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}
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/* Read Status: i2c over aux */
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ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_LSPCON_CURRENT_MODE,
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&data, sizeof(data));
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if (ret < 0) {
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DRM_ERROR("LSPCON read(0x80, 0x41) failed\n");
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return -EFAULT;
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}
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if (data & DP_DUAL_MODE_LSPCON_MODE_PCON)
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*mode = DRM_LSPCON_MODE_PCON;
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else
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*mode = DRM_LSPCON_MODE_LS;
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return 0;
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}
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EXPORT_SYMBOL(drm_lspcon_get_mode);
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/**
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* drm_lspcon_change_mode: Change LSPCON's mode of operation by
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* by writing offset (0x80, 0x40)
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* @i2c_adapter: I2C-over-aux adapter
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* @reqd_mode: required mode of operation
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*
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* Returns:
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* 0 on success, -error on failure/timeout
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*/
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int drm_lspcon_set_mode(struct i2c_adapter *adapter,
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enum drm_lspcon_mode mode)
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{
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u8 data = 0;
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int ret;
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int time_out = 200;
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enum drm_lspcon_mode current_mode;
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if (mode == DRM_LSPCON_MODE_PCON)
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data = DP_DUAL_MODE_LSPCON_MODE_PCON;
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/* Change mode */
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ret = drm_dp_dual_mode_write(adapter, DP_DUAL_MODE_LSPCON_MODE_CHANGE,
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&data, sizeof(data));
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if (ret < 0) {
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DRM_ERROR("LSPCON mode change failed\n");
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return ret;
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}
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/*
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* Confirm mode change by reading the status bit.
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* Sometimes, it takes a while to change the mode,
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* so wait and retry until time out or done.
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*/
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do {
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ret = drm_lspcon_get_mode(adapter, ¤t_mode);
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if (ret) {
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DRM_ERROR("can't confirm LSPCON mode change\n");
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return ret;
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} else {
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if (current_mode != mode) {
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msleep(10);
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time_out -= 10;
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} else {
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DRM_DEBUG_KMS("LSPCON mode changed to %s\n",
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mode == DRM_LSPCON_MODE_LS ?
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"LS" : "PCON");
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return 0;
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}
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}
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} while (time_out);
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DRM_ERROR("LSPCON mode change timed out\n");
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return -ETIMEDOUT;
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}
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EXPORT_SYMBOL(drm_lspcon_set_mode);
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@ -40,6 +40,8 @@
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#define DP_DUAL_MODE_REV_TYPE2 0x00
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#define DP_DUAL_MODE_TYPE_MASK 0xf0
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#define DP_DUAL_MODE_TYPE_TYPE2 0xa0
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/* This field is marked reserved in dual mode spec, used in LSPCON */
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#define DP_DUAL_MODE_TYPE_HAS_DPCD 0x08
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#define DP_DUAL_MODE_IEEE_OUI 0x11 /* 11-13*/
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#define DP_DUAL_IEEE_OUI_LEN 3
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#define DP_DUAL_DEVICE_ID 0x14 /* 14-19 */
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@ -55,6 +57,11 @@
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#define DP_DUAL_MODE_CEC_ENABLE 0x01
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#define DP_DUAL_MODE_I2C_SPEED_CTRL 0x22
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/* LSPCON specific registers, defined by MCA */
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#define DP_DUAL_MODE_LSPCON_MODE_CHANGE 0x40
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#define DP_DUAL_MODE_LSPCON_CURRENT_MODE 0x41
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#define DP_DUAL_MODE_LSPCON_MODE_PCON 0x1
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struct i2c_adapter;
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ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
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@ -62,6 +69,19 @@ ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
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ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
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u8 offset, const void *buffer, size_t size);
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/**
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* enum drm_lspcon_mode
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* @lspcon_mode_ls: Level shifter mode of LSPCON
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* which drives DP++ to HDMI 1.4 conversion.
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* @lspcon_mode_pcon: Protocol converter mode of LSPCON
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* which drives DP++ to HDMI 2.0 active conversion.
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*/
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enum drm_lspcon_mode {
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DRM_LSPCON_MODE_INVALID,
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DRM_LSPCON_MODE_LS,
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DRM_LSPCON_MODE_PCON,
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};
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/**
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* enum drm_dp_dual_mode_type - Type of the DP dual mode adaptor
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* @DRM_DP_DUAL_MODE_NONE: No DP dual mode adaptor
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@ -70,6 +90,7 @@ ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
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* @DRM_DP_DUAL_MODE_TYPE1_HDMI: Type 1 HDMI adaptor
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* @DRM_DP_DUAL_MODE_TYPE2_DVI: Type 2 DVI adaptor
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* @DRM_DP_DUAL_MODE_TYPE2_HDMI: Type 2 HDMI adaptor
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* @DRM_DP_DUAL_MODE_TYPE2_LSPCON: Level shifter /protocol converter
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*/
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enum drm_dp_dual_mode_type {
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DRM_DP_DUAL_MODE_NONE,
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@ -78,6 +99,7 @@ enum drm_dp_dual_mode_type {
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DRM_DP_DUAL_MODE_TYPE1_HDMI,
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DRM_DP_DUAL_MODE_TYPE2_DVI,
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DRM_DP_DUAL_MODE_TYPE2_HDMI,
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DRM_DP_DUAL_MODE_LSPCON,
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};
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enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter);
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@ -89,4 +111,8 @@ int drm_dp_dual_mode_set_tmds_output(enum drm_dp_dual_mode_type type,
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struct i2c_adapter *adapter, bool enable);
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const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type);
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int drm_lspcon_get_mode(struct i2c_adapter *adapter,
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enum drm_lspcon_mode *current_mode);
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int drm_lspcon_set_mode(struct i2c_adapter *adapter,
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enum drm_lspcon_mode reqd_mode);
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#endif
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