+Kishon Thanks & Regards, Yuti Amonkar
> -----Original Message----- > From: Yuti Amonkar <yamon...@cadence.com> > Sent: Monday, December 23, 2019 19:11 > To: linux-ker...@vger.kernel.org; dri-devel@lists.freedesktop.org; > max...@cerno.tech > Cc: prane...@ti.com; tomi.valkei...@ti.com; jsa...@ti.com; Milind Parab > <mpa...@cadence.com>; Swapnil Kashinath Jakhade > <sjakh...@cadence.com>; Yuti Suresh Amonkar <yamon...@cadence.com> > Subject: [PATCH v2] phy: Add DisplayPort configuration options > > Allow DisplayPort PHYs to be configured through the generic functions > through a custom structure added to the generic union. > The configuration structure is used for reconfiguration of DisplayPort PHYs > during link training operation. > > The parameters added here are the ones defined in the DisplayPort spec 1.4 > which include link rate, number of lanes, voltage swing and pre-emphasis. > > Signed-off-by: Yuti Amonkar <yamon...@cadence.com> > --- > > This patch was a part of [1] series earlier but we think that it needs to > have a > separate attention of the reviewers. Also as both [1] & [2] are dependent on > this patch, our sincere request to reviewers to have a faster review of this > patch. > > [1] > > https://lkml.org/lkml/2019/12/11/455 > > [2] > > https://patchwork.kernel.org/cover/11271191/ > > include/linux/phy/phy-dp.h | 95 > ++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/phy/phy.h | 4 ++ > 2 files changed, 99 insertions(+) > create mode 100644 include/linux/phy/phy-dp.h > > diff --git a/include/linux/phy/phy-dp.h b/include/linux/phy/phy-dp.h new > file mode 100644 index 0000000..18cad23 > --- /dev/null > +++ b/include/linux/phy/phy-dp.h > @@ -0,0 +1,95 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (C) 2019 Cadence Design Systems Inc. > + */ > + > +#ifndef __PHY_DP_H_ > +#define __PHY_DP_H_ > + > +#include <linux/types.h> > + > +/** > + * struct phy_configure_opts_dp - DisplayPort PHY configuration set > + * > + * This structure is used to represent the configuration state of a > + * DisplayPort phy. > + */ > +struct phy_configure_opts_dp { > + /** > + * @link_rate: > + * > + * Link Rate, in Mb/s, of the main link. > + * > + * Allowed values: 1620, 2160, 2430, 2700, 3240, 4320, 5400, 8100 > Mb/s > + */ > + unsigned int link_rate; > + > + /** > + * @lanes: > + * > + * Number of active, consecutive, data lanes, starting from > + * lane 0, used for the transmissions on main link. > + * > + * Allowed values: 1, 2, 4 > + */ > + unsigned int lanes; > + > + /** > + * @voltage: > + * > + * Voltage swing levels, as specified by DisplayPort specification, > + * to be used by particular lanes. One value per lane. > + * voltage[0] is for lane 0, voltage[1] is for lane 1, etc. > + * > + * Maximum value: 3 > + */ > + unsigned int voltage[4]; > + > + /** > + * @pre: > + * > + * Pre-emphasis levels, as specified by DisplayPort specification, to be > + * used by particular lanes. One value per lane. > + * > + * Maximum value: 3 > + */ > + unsigned int pre[4]; > + > + /** > + * @ssc: > + * > + * Flag indicating, whether or not to enable spread-spectrum > clocking. > + * > + */ > + u8 ssc : 1; > + > + /** > + * @set_rate: > + * > + * Flag indicating, whether or not reconfigure link rate and SSC to > + * requested values. > + * > + */ > + u8 set_rate : 1; > + > + /** > + * @set_lanes: > + * > + * Flag indicating, whether or not reconfigure lane count to > + * requested value. > + * > + */ > + u8 set_lanes : 1; > + > + /** > + * @set_voltages: > + * > + * Flag indicating, whether or not reconfigure voltage swing > + * and pre-emphasis to requested values. Only lanes specified > + * by "lanes" parameter will be affected. > + * > + */ > + u8 set_voltages : 1; > +}; > + > +#endif /* __PHY_DP_H_ */ > diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h index > 15032f14..ba0aab5 100644 > --- a/include/linux/phy/phy.h > +++ b/include/linux/phy/phy.h > @@ -16,6 +16,7 @@ > #include <linux/pm_runtime.h> > #include <linux/regulator/consumer.h> > > +#include <linux/phy/phy-dp.h> > #include <linux/phy/phy-mipi-dphy.h> > > struct phy; > @@ -46,9 +47,12 @@ enum phy_mode { > * > * @mipi_dphy: Configuration set applicable for phys supporting > * the MIPI_DPHY phy mode. > + * @dp: Configuration set applicable for phys supporting > + * the DisplayPort protocol. > */ > union phy_configure_opts { > struct phy_configure_opts_mipi_dphy mipi_dphy; > + struct phy_configure_opts_dp dp; > }; > > /** > -- > 2.7.4 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
