81239c6f79
With CONFIG_DYNAMIC_DEBUG=y, the following compile error occurs:
drivers/gpu/drm/tegra/mipi-phy.c: In function ‘mipi_dphy_timing_validate’:
drivers/gpu/drm/tegra/mipi-phy.c:69:11: error: ‘EINVAL’ undeclared (first use in this function)
drivers/gpu/drm/tegra/mipi-phy.c:69:11: note: each undeclared identifier is reported only once for each function it appears in
Fix this by directly including the header that defines EINVAL.
Fixes: dec727399a ("drm/tegra: Add DSI support")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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* Copyright (C) 2013 NVIDIA Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include "mipi-phy.h"
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/*
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* Default D-PHY timings based on MIPI D-PHY specification. Derived from
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* the valid ranges specified in Section 5.9 of the D-PHY specification
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* with minor adjustments.
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*/
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int mipi_dphy_timing_get_default(struct mipi_dphy_timing *timing,
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unsigned long period)
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{
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timing->clkmiss = 0;
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timing->clkpost = 70 + 52 * period;
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timing->clkpre = 8;
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timing->clkprepare = 65;
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timing->clksettle = 95;
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timing->clktermen = 0;
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timing->clktrail = 80;
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timing->clkzero = 260;
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timing->dtermen = 0;
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timing->eot = 0;
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timing->hsexit = 120;
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timing->hsprepare = 65 + 5 * period;
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timing->hszero = 145 + 5 * period;
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timing->hssettle = 85 + 6 * period;
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timing->hsskip = 40;
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timing->hstrail = max(8 * period, 60 + 4 * period);
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timing->init = 100000;
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timing->lpx = 60;
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timing->taget = 5 * timing->lpx;
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timing->tago = 4 * timing->lpx;
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timing->tasure = 2 * timing->lpx;
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timing->wakeup = 1000000;
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return 0;
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}
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/*
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* Validate D-PHY timing according to MIPI Alliance Specification for D-PHY,
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* Section 5.9 "Global Operation Timing Parameters".
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*/
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int mipi_dphy_timing_validate(struct mipi_dphy_timing *timing,
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unsigned long period)
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{
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if (timing->clkmiss > 60)
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return -EINVAL;
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if (timing->clkpost < (60 + 52 * period))
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return -EINVAL;
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if (timing->clkpre < 8)
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return -EINVAL;
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if (timing->clkprepare < 38 || timing->clkprepare > 95)
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return -EINVAL;
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if (timing->clksettle < 95 || timing->clksettle > 300)
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return -EINVAL;
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if (timing->clktermen > 38)
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return -EINVAL;
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if (timing->clktrail < 60)
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return -EINVAL;
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if (timing->clkprepare + timing->clkzero < 300)
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return -EINVAL;
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if (timing->dtermen > 35 + 4 * period)
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return -EINVAL;
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if (timing->eot > 105 + 12 * period)
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return -EINVAL;
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if (timing->hsexit < 100)
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return -EINVAL;
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if (timing->hsprepare < 40 + 4 * period ||
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timing->hsprepare > 85 + 6 * period)
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return -EINVAL;
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if (timing->hsprepare + timing->hszero < 145 + 10 * period)
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return -EINVAL;
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if ((timing->hssettle < 85 + 6 * period) ||
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(timing->hssettle > 145 + 10 * period))
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return -EINVAL;
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if (timing->hsskip < 40 || timing->hsskip > 55 + 4 * period)
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return -EINVAL;
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if (timing->hstrail < max(8 * period, 60 + 4 * period))
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return -EINVAL;
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if (timing->init < 100000)
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return -EINVAL;
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if (timing->lpx < 50)
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return -EINVAL;
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if (timing->taget != 5 * timing->lpx)
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return -EINVAL;
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if (timing->tago != 4 * timing->lpx)
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return -EINVAL;
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if (timing->tasure < timing->lpx || timing->tasure > 2 * timing->lpx)
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return -EINVAL;
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if (timing->wakeup < 1000000)
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return -EINVAL;
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return 0;
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}
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