From: Thierry Reding <thierry.reding@gmail.com>
To: Vinay Simha <simhavcs@gmail.com>
Cc: Archit Taneja <archit.taneja@gmail.com>,
Sumit Semwal <sumit.semwal@linaro.org>,
John Stultz <john.stultz@linaro.org>,
Rob Clark <robdclark@gmail.com>, David Airlie <airlied@linux.ie>,
open list <linux-kernel@vger.kernel.org>,
"open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH v4 2/2] drm/panel: Add JDI LT070ME05000 WUXGA DSI Panel
Date: Tue, 14 Jun 2016 13:25:27 +0200 [thread overview]
Message-ID: <20160614112527.GA30021@ulmo.ba.sec> (raw)
In-Reply-To: <CAGWqDJ4AFjqOGxS1-_EBu5WOFVWaUqM+g6nWyparEkKN1yYbVg@mail.gmail.com>
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On Tue, Jun 14, 2016 at 04:27:53PM +0530, Vinay Simha wrote:
[...]
> On Mon, Jun 13, 2016 at 6:05 PM, Thierry Reding
> <thierry.reding@gmail.com> wrote:
> > On Mon, Jun 13, 2016 at 03:55:28PM +0530, Vinay Simha BN wrote:
[...]
> >> +const char *regs[] = {
> >> + "vddp",
> >> + "dcdc_en",
> >> + "vcc"
> >> +};
> >
> > This should be static. Also use a more sensible name, such as
> > regulator_names, please.
> it kept as regs, to keep constant names as used in
> the dsi_cfg file
> drivers/gpu/drm/msm/dsi/dsi_cfg.c
That's a completely different driver, no need to be consistent.
> >> +static int jdi_panel_init(struct jdi_panel *jdi)
> >> +{
> > [...]
> >> + struct mipi_dsi_device *dsi = jdi->dsi;
> >> + int ret;
> >> +
> >> + dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> >> +
> >> + ret = mipi_dsi_dcs_soft_reset(dsi);
> >> + if (ret < 0)
> >> + return ret;
> >> +
> >> + usleep_range(10000, 20000);
> >> +
> >> + ret = mipi_dsi_dcs_set_pixel_format(dsi, 0x70);
> >> + if (ret < 0)
> >> + return ret;
> >
> > Please use the existing symbolic constants for this.
> i am not clear on the symbolic constants for pixel_format ?
See include/video/mipi_display.h
> >> +
> >> + ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
> >> + (u8[]){ 0x24 }, 1);
> >> + if (ret < 0)
> >> + return ret;
> brightness control setting, to enable pwm/backlight
> >> +
> >> + ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
> >> + (u8[]){ 0x00 }, 1);
> >> + if (ret < 0)
> >> + return ret;
> >
> this is to set cabc off/on
Can you point me to the specification of these? I'd like to investigate
whether or not we can turn these into more sensible commands. As-is, it
is completely obfuscated and I'd like to avoid that where possible.
> >> + ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
> >> + if (ret < 0)
> >> + return ret;
> >> + mdelay(10);
> >
> > Same here. This also needs at least a comment, though ideally you'd use
> > symbolic names for those magic numbers.
> i do not have the datasheet to give more description.
> this is for interface setting, either command mode/video mode
Okay, please add a comment on what this is supposed to do, then.
> >> +
> >> + jdi->mode = &default_mode;
> >> +
> >> + for (i = 0; i < num; i++)
> >> + s[i].supply = regs[i];
> >> +
> >> + ret = devm_regulator_bulk_get(dev, num, s);
> >> + if (ret < 0) {
> >> + dev_err(dev, "%s: failed to init regulator, ret=%d\n",
> >> + __func__, ret);
> >> + return ret;
> >> + }
> >> +
> >> + jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> >> + if (IS_ERR(jdi->reset_gpio)) {
> >> + dev_err(dev, "cannot get reset-gpios %ld\n",
> >> + PTR_ERR(jdi->reset_gpio));
> >
> > This is a third variant of error reporting. Please stick to one.
> for PTR_ERR(jdi->reset_gpio) returns unsigned long, so this error reporting
> cannot be changed to ret,
> others error reporting incorporated consistently.
PTR_ERR() returns signed long, not unsigned.
You can still use the same format for the message and substitute the
%ld printk specifier to match the type.
Thierry
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next prev parent reply other threads:[~2016-06-14 11:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-13 10:25 [PATCH v2 1/2] drm/dsi: Implement dcs set/get display brightness Vinay Simha BN
2016-06-13 10:25 ` [PATCH v4 2/2] drm/panel: Add JDI LT070ME05000 WUXGA DSI Panel Vinay Simha BN
2016-06-13 12:35 ` Thierry Reding
2016-06-14 10:57 ` Vinay Simha
2016-06-14 11:25 ` Thierry Reding [this message]
2016-06-14 17:03 ` Vinay Simha
2016-06-15 13:11 ` Vinay Simha
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