Ops, I had forgot to reply to this one although I have reviewed!<div> </div><div>Feel free to use </div><div>Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> On Tuesday, July 5, 2016, Shashank Sharma <<a href="mailto:shashank.sharma@intel.com">shashank.sharma@intel.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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 Signed-off-by: Shashank Sharma <<a href="javascript:;" onclick="_e(event, 'cvml', 'shashank.sharma@intel.com')">shashank.sharma@intel.com</a>> --- drivers/gpu/drm/drm_dp_dual_mode_helper.c | 103 ++++++++++++++++++++++++++++++ include/drm/drm_dp_dual_mode_helper.h | 26 ++++++++ 2 files changed, 129 insertions(+) diff --git a/drivers/gpu/drm/drm_dp_dual_mode_helper.c b/drivers/gpu/drm/drm_dp_dual_mode_helper.c index a7b2a75..4f89e0b 100644 --- a/drivers/gpu/drm/drm_dp_dual_mode_helper.c +++ b/drivers/gpu/drm/drm_dp_dual_mode_helper.c @@ -148,6 +148,14 @@ static bool is_type2_adaptor(uint8_t adaptor_id) DP_DUAL_MODE_REV_TYPE2); } +bool is_lspcon_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN], + const uint8_t adaptor_id) +{ + return is_hdmi_adaptor(hdmi_id) && + (adaptor_id == (DP_DUAL_MODE_TYPE_TYPE2 | + DP_DUAL_MODE_TYPE_HAS_DPCD)); +} + /** * drm_dp_dual_mode_detect - Identify the DP dual mode adaptor * @adapter: I2C adapter for the DDC bus @@ -203,6 +211,8 @@ enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter) ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_ADAPTOR_ID, &adaptor_id, sizeof(adaptor_id)); if (ret == 0) { + if (is_lspcon_adaptor(hdmi_id, adaptor_id)) + return DRM_DP_DUAL_MODE_LSPCON; if (is_type2_adaptor(adaptor_id)) { if (is_hdmi_adaptor(hdmi_id)) return DRM_DP_DUAL_MODE_TYPE2_HDMI; @@ -364,3 +374,96 @@ const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type) } } EXPORT_SYMBOL(drm_dp_get_dual_mode_type_name); + +/** + * drm_lspcon_get_current_mode: Get LSPCON's current mode of operation by + * by reading offset (0x80, 0x41) + * @i2c_adapter: I2C-over-aux adapter + * @current_mode: out vaiable, current lspcon mode of operation + * + * Returns: + * 0 on success, sets the current_mode value to appropriate mode + * -error on failure + */ +int drm_lspcon_get_mode(struct i2c_adapter *adapter, + enum drm_lspcon_mode *current_mode) +{ + u8 data; + int ret = 0; + + if (!current_mode) { + DRM_ERROR("NULL input\n"); + return -EINVAL; + } + + /* Read Status: i2c over aux */ + ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_LSPCON_CURRENT_MODE, + (void *)&data, sizeof(data)); + if (ret < 0) { + DRM_ERROR("LSPCON read(0x80, 0x41) failed\n"); + return -EFAULT; + } + + if (data & DP_DUAL_MODE_LSPCON_MODE_PCON) + *current_mode = DRM_LSPCON_MODE_PCON; + else + *current_mode = DRM_LSPCON_MODE_LS; + return 0; +} +EXPORT_SYMBOL(drm_lspcon_get_mode); + +/** + * drm_lspcon_change_mode: Change LSPCON's mode of operation by + * by writing offset (0x80, 0x40) + * @i2c_adapter: I2C-over-aux adapter + * @reqd_mode: required mode of operation + * + * Returns: + * 0 on success, -error on failure/timeout + */ +int drm_lspcon_set_mode(struct i2c_adapter *adapter, + enum drm_lspcon_mode reqd_mode) +{ + u8 data = 0; + int ret; + int time_out = 200; + enum drm_lspcon_mode changed_mode; + + if (reqd_mode == DRM_LSPCON_MODE_PCON) + data = DP_DUAL_MODE_LSPCON_MODE_PCON; + + /* Change mode */ + ret = drm_dp_dual_mode_write(adapter, DP_DUAL_MODE_LSPCON_MODE_CHANGE, + &data, sizeof(data)); + if (ret < 0) { + DRM_ERROR("LSPCON mode change failed\n"); + return ret; + } + + /* + * Confirm mode change by reading the status bit. + * Sometimes, it takes a while to change the mode, + * so wait and retry until time out or done. + */ + do { + ret = drm_lspcon_get_mode(adapter, &changed_mode); + if (ret) { + DRM_ERROR("cant confirm LSPCON mode change\n"); + return ret; + } else { + if (changed_mode != reqd_mode) { + msleep(10); + time_out -= 10; + } else { + DRM_DEBUG_KMS("LSPCON mode changed to %s\n", + reqd_mode == DRM_LSPCON_MODE_LS ? + "LS" : "PCON"); + return 0; + } + } + } while (time_out); + + DRM_ERROR("LSPCON mode change timed out\n"); + return -ETIMEDOUT; +} +EXPORT_SYMBOL(drm_lspcon_set_mode); diff --git a/include/drm/drm_dp_dual_mode_helper.h b/include/drm/drm_dp_dual_mode_helper.h index e8a9dfd..a3c1d03 100644 --- a/include/drm/drm_dp_dual_mode_helper.h +++ b/include/drm/drm_dp_dual_mode_helper.h @@ -24,6 +24,7 @@ #define DRM_DP_DUAL_MODE_HELPER_H #include <linux/types.h> +#include <drm/drm_edid.h> /* * Optional for type 1 DVI adaptors @@ -40,6 +41,7 @@ #define DP_DUAL_MODE_REV_TYPE2 0x00 #define DP_DUAL_MODE_TYPE_MASK 0xf0 #define DP_DUAL_MODE_TYPE_TYPE2 0xa0 +#define DP_DUAL_MODE_TYPE_HAS_DPCD 0x08 #define DP_DUAL_MODE_IEEE_OUI 0x11 /* 11-13*/ #define DP_DUAL_IEEE_OUI_LEN 3 #define DP_DUAL_DEVICE_ID 0x14 /* 14-19 */ @@ -55,6 +57,11 @@ #define DP_DUAL_MODE_CEC_ENABLE 0x01 #define DP_DUAL_MODE_I2C_SPEED_CTRL 0x22 +/* LSPCON specific registers, defined by MCA */ +#define DP_DUAL_MODE_LSPCON_MODE_CHANGE 0x40 +#define DP_DUAL_MODE_LSPCON_CURRENT_MODE 0x41 +#define DP_DUAL_MODE_LSPCON_MODE_PCON 0x1 + struct i2c_adapter; ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter, @@ -63,6 +70,19 @@ ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter, u8 offset, const void *buffer, size_t size); /** +* enum drm_lspcon_mode +* @lspcon_mode_ls: Level shifter mode of LSPCON +* which drives DP++ to HDMI 1.4 conversion. +* @lspcon_mode_pcon: Protocol converter mode of LSPCON +* which drives DP++ to HDMI 2.0 active conversion. +*/ +enum drm_lspcon_mode { + DRM_LSPCON_MODE_INVALID, + DRM_LSPCON_MODE_LS, + DRM_LSPCON_MODE_PCON, +}; + +/** * enum drm_dp_dual_mode_type - Type of the DP dual mode adaptor * @DRM_DP_DUAL_MODE_NONE: No DP dual mode adaptor * @DRM_DP_DUAL_MODE_UNKNOWN: Could be either none or type 1 DVI adaptor @@ -70,6 +90,7 @@ ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter, * @DRM_DP_DUAL_MODE_TYPE1_HDMI: Type 1 HDMI adaptor * @DRM_DP_DUAL_MODE_TYPE2_DVI: Type 2 DVI adaptor * @DRM_DP_DUAL_MODE_TYPE2_HDMI: Type 2 HDMI adaptor + * @DRM_DP_DUAL_MODE_TYPE2_LSPCON: Level shifter /protocol converter */ enum drm_dp_dual_mode_type { DRM_DP_DUAL_MODE_NONE, @@ -78,6 +99,7 @@ enum drm_dp_dual_mode_type { DRM_DP_DUAL_MODE_TYPE1_HDMI, DRM_DP_DUAL_MODE_TYPE2_DVI, DRM_DP_DUAL_MODE_TYPE2_HDMI, + DRM_DP_DUAL_MODE_LSPCON, }; enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter); @@ -89,4 +111,8 @@ int drm_dp_dual_mode_set_tmds_output(enum drm_dp_dual_mode_type type, struct i2c_adapter *adapter, bool enable); const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type); +int drm_lspcon_get_mode(struct i2c_adapter *adapter, + enum drm_lspcon_mode *current_mode); +int drm_lspcon_set_mode(struct i2c_adapter *adapter, + enum drm_lspcon_mode reqd_mode); #endif -- 1.9.1 </blockquote></div> -- <div>Rodrigo Vivi</div><div>Blog: <a href="http://blog.vivi.eng.br" target="_blank">http://blog.vivi.eng.br</a></div><div> </div>