Re: [PATCH v4 04/15] drm/edid: Use new encoded panel id style for quirks matching

From: Jani Nikula
Date: Tue Sep 14 2021 - 14:55:13 EST

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On Thu, 09 Sep 2021, Douglas Anderson <dianders@xxxxxxxxxxxx> wrote:
> In the patch ("drm/edid: Allow the querying/working with the panel ID
> from the EDID") we introduced a different way of working with the
> panel ID stored in the EDID. Let's use this new way for the quirks
> code.
>
> Advantages of the new style:
> * Smaller data structure size. Saves 4 bytes per panel.
> * Iterate through quirks structure with just "==" instead of strncmp()
> * In-kernel storage is more similar to what's stored in the EDID
> itself making it easier to grok that they are referring to the same
> value.
>
> The quirk table itself is arguably a bit less readable in the new
> style but not a ton less and it feels like the above advantages make
> up for it.
>
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>

Eyeballed the edid_quirk_list, but did not check every bit.

Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>

> ---
> This commit is only compile-tested. I don't have any DP panels that
> exercise this code. Transition from the old table to the new one was
> done with a regexp.
>
> Changes in v4:
> - ("Use new encoded panel id style for quirks matching") new for v4.
>
> drivers/gpu/drm/drm_edid.c | 157 +++++++++++++++++--------------------
> 1 file changed, 71 insertions(+), 86 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index f84e0dd264f4..9b19eee0e1b4 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -100,122 +100,128 @@ struct detailed_mode_closure {
> #define LEVEL_GTF2 2
> #define LEVEL_CVT 3
>
> +#define EDID_QUIRK(vend_chr_0, vend_chr_1, vend_chr_2, product_id, _quirks) \
> +{ \
> + .panel_id = drm_edid_encode_panel_id(vend_chr_0, vend_chr_1, vend_chr_2, \
> + product_id), \
> + .quirks = _quirks \
> +}
> +
> static const struct edid_quirk {
> - char vendor[4];
> - int product_id;
> + u32 panel_id;
> u32 quirks;
> } edid_quirk_list[] = {
> /* Acer AL1706 */
> - { "ACR", 44358, EDID_QUIRK_PREFER_LARGE_60 },
> + EDID_QUIRK('A', 'C', 'R', 44358, EDID_QUIRK_PREFER_LARGE_60),
> /* Acer F51 */
> - { "API", 0x7602, EDID_QUIRK_PREFER_LARGE_60 },
> + EDID_QUIRK('A', 'P', 'I', 0x7602, EDID_QUIRK_PREFER_LARGE_60),
>
> /* AEO model 0 reports 8 bpc, but is a 6 bpc panel */
> - { "AEO", 0, EDID_QUIRK_FORCE_6BPC },
> + EDID_QUIRK('A', 'E', 'O', 0, EDID_QUIRK_FORCE_6BPC),
>
> /* BOE model on HP Pavilion 15-n233sl reports 8 bpc, but is a 6 bpc panel */
> - { "BOE", 0x78b, EDID_QUIRK_FORCE_6BPC },
> + EDID_QUIRK('B', 'O', 'E', 0x78b, EDID_QUIRK_FORCE_6BPC),
>
> /* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */
> - { "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC },
> + EDID_QUIRK('C', 'P', 'T', 0x17df, EDID_QUIRK_FORCE_6BPC),
>
> /* SDC panel of Lenovo B50-80 reports 8 bpc, but is a 6 bpc panel */
> - { "SDC", 0x3652, EDID_QUIRK_FORCE_6BPC },
> + EDID_QUIRK('S', 'D', 'C', 0x3652, EDID_QUIRK_FORCE_6BPC),
>
> /* BOE model 0x0771 reports 8 bpc, but is a 6 bpc panel */
> - { "BOE", 0x0771, EDID_QUIRK_FORCE_6BPC },
> + EDID_QUIRK('B', 'O', 'E', 0x0771, EDID_QUIRK_FORCE_6BPC),
>
> /* Belinea 10 15 55 */
> - { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
> - { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
> + EDID_QUIRK('M', 'A', 'X', 1516, EDID_QUIRK_PREFER_LARGE_60),
> + EDID_QUIRK('M', 'A', 'X', 0x77e, EDID_QUIRK_PREFER_LARGE_60),
>
> /* Envision Peripherals, Inc. EN-7100e */
> - { "EPI", 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH },
> + EDID_QUIRK('E', 'P', 'I', 59264, EDID_QUIRK_135_CLOCK_TOO_HIGH),
> /* Envision EN2028 */
> - { "EPI", 8232, EDID_QUIRK_PREFER_LARGE_60 },
> + EDID_QUIRK('E', 'P', 'I', 8232, EDID_QUIRK_PREFER_LARGE_60),
>
> /* Funai Electronics PM36B */
> - { "FCM", 13600, EDID_QUIRK_PREFER_LARGE_75 |
> - EDID_QUIRK_DETAILED_IN_CM },
> + EDID_QUIRK('F', 'C', 'M', 13600, EDID_QUIRK_PREFER_LARGE_75 |
> + EDID_QUIRK_DETAILED_IN_CM),
>
> /* LGD panel of HP zBook 17 G2, eDP 10 bpc, but reports unknown bpc */
> - { "LGD", 764, EDID_QUIRK_FORCE_10BPC },
> + EDID_QUIRK('L', 'G', 'D', 764, EDID_QUIRK_FORCE_10BPC),
>
> /* LG Philips LCD LP154W01-A5 */
> - { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
> - { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
> + EDID_QUIRK('L', 'P', 'L', 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE),
> + EDID_QUIRK('L', 'P', 'L', 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE),
>
> /* Samsung SyncMaster 205BW. Note: irony */
> - { "SAM", 541, EDID_QUIRK_DETAILED_SYNC_PP },
> + EDID_QUIRK('S', 'A', 'M', 541, EDID_QUIRK_DETAILED_SYNC_PP),
> /* Samsung SyncMaster 22[5-6]BW */
> - { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
> - { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
> + EDID_QUIRK('S', 'A', 'M', 596, EDID_QUIRK_PREFER_LARGE_60),
> + EDID_QUIRK('S', 'A', 'M', 638, EDID_QUIRK_PREFER_LARGE_60),
>
> /* Sony PVM-2541A does up to 12 bpc, but only reports max 8 bpc */
> - { "SNY", 0x2541, EDID_QUIRK_FORCE_12BPC },
> + EDID_QUIRK('S', 'N', 'Y', 0x2541, EDID_QUIRK_FORCE_12BPC),
>
> /* ViewSonic VA2026w */
> - { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
> + EDID_QUIRK('V', 'S', 'C', 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING),
>
> /* Medion MD 30217 PG */
> - { "MED", 0x7b8, EDID_QUIRK_PREFER_LARGE_75 },
> + EDID_QUIRK('M', 'E', 'D', 0x7b8, EDID_QUIRK_PREFER_LARGE_75),
>
> /* Lenovo G50 */
> - { "SDC", 18514, EDID_QUIRK_FORCE_6BPC },
> + EDID_QUIRK('S', 'D', 'C', 18514, EDID_QUIRK_FORCE_6BPC),
>
> /* Panel in Samsung NP700G7A-S01PL notebook reports 6bpc */
> - { "SEC", 0xd033, EDID_QUIRK_FORCE_8BPC },
> + EDID_QUIRK('S', 'E', 'C', 0xd033, EDID_QUIRK_FORCE_8BPC),
>
> /* Rotel RSX-1058 forwards sink's EDID but only does HDMI 1.1*/
> - { "ETR", 13896, EDID_QUIRK_FORCE_8BPC },
> + EDID_QUIRK('E', 'T', 'R', 13896, EDID_QUIRK_FORCE_8BPC),
>
> /* Valve Index Headset */
> - { "VLV", 0x91a8, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b0, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b1, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b2, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b3, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b4, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b5, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b6, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b7, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b8, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91b9, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91ba, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91bb, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91bc, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91bd, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91be, EDID_QUIRK_NON_DESKTOP },
> - { "VLV", 0x91bf, EDID_QUIRK_NON_DESKTOP },
> + EDID_QUIRK('V', 'L', 'V', 0x91a8, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b0, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b1, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b2, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b3, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b4, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b5, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b6, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b7, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b8, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91b9, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91ba, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91bb, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91bc, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91bd, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91be, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('V', 'L', 'V', 0x91bf, EDID_QUIRK_NON_DESKTOP),
>
> /* HTC Vive and Vive Pro VR Headsets */
> - { "HVR", 0xaa01, EDID_QUIRK_NON_DESKTOP },
> - { "HVR", 0xaa02, EDID_QUIRK_NON_DESKTOP },
> + EDID_QUIRK('H', 'V', 'R', 0xaa01, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('H', 'V', 'R', 0xaa02, EDID_QUIRK_NON_DESKTOP),
>
> /* Oculus Rift DK1, DK2, CV1 and Rift S VR Headsets */
> - { "OVR", 0x0001, EDID_QUIRK_NON_DESKTOP },
> - { "OVR", 0x0003, EDID_QUIRK_NON_DESKTOP },
> - { "OVR", 0x0004, EDID_QUIRK_NON_DESKTOP },
> - { "OVR", 0x0012, EDID_QUIRK_NON_DESKTOP },
> + EDID_QUIRK('O', 'V', 'R', 0x0001, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('O', 'V', 'R', 0x0003, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('O', 'V', 'R', 0x0004, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('O', 'V', 'R', 0x0012, EDID_QUIRK_NON_DESKTOP),
>
> /* Windows Mixed Reality Headsets */
> - { "ACR", 0x7fce, EDID_QUIRK_NON_DESKTOP },
> - { "HPN", 0x3515, EDID_QUIRK_NON_DESKTOP },
> - { "LEN", 0x0408, EDID_QUIRK_NON_DESKTOP },
> - { "LEN", 0xb800, EDID_QUIRK_NON_DESKTOP },
> - { "FUJ", 0x1970, EDID_QUIRK_NON_DESKTOP },
> - { "DEL", 0x7fce, EDID_QUIRK_NON_DESKTOP },
> - { "SEC", 0x144a, EDID_QUIRK_NON_DESKTOP },
> - { "AUS", 0xc102, EDID_QUIRK_NON_DESKTOP },
> + EDID_QUIRK('A', 'C', 'R', 0x7fce, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('H', 'P', 'N', 0x3515, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('L', 'E', 'N', 0x0408, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('L', 'E', 'N', 0xb800, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('F', 'U', 'J', 0x1970, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('D', 'E', 'L', 0x7fce, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('S', 'E', 'C', 0x144a, EDID_QUIRK_NON_DESKTOP),
> + EDID_QUIRK('A', 'U', 'S', 0xc102, EDID_QUIRK_NON_DESKTOP),
>
> /* Sony PlayStation VR Headset */
> - { "SNY", 0x0704, EDID_QUIRK_NON_DESKTOP },
> + EDID_QUIRK('S', 'N', 'Y', 0x0704, EDID_QUIRK_NON_DESKTOP),
>
> /* Sensics VR Headsets */
> - { "SEN", 0x1019, EDID_QUIRK_NON_DESKTOP },
> + EDID_QUIRK('S', 'E', 'N', 0x1019, EDID_QUIRK_NON_DESKTOP),
>
> /* OSVR HDK and HDK2 VR Headsets */
> - { "SVR", 0x1019, EDID_QUIRK_NON_DESKTOP },
> + EDID_QUIRK('S', 'V', 'R', 0x1019, EDID_QUIRK_NON_DESKTOP),
> };
>
> /*
> @@ -2090,9 +2096,8 @@ EXPORT_SYMBOL(drm_get_edid);
> static u32 edid_extract_panel_id(const struct edid *edid)
> {
> /*
> - * In theory we could try to de-obfuscate this like edid_get_quirks()
> - * does, but it's easier to just deal with a 32-bit number since then
> - * it can be compared with "==".
> + * We represent the ID as a 32-bit number so it can easily be compared
> + * with "==".
> *
> * NOTE that we deal with endianness differently for the top half
> * of this ID than for the bottom half. The bottom half (the product
> @@ -2197,25 +2202,6 @@ EXPORT_SYMBOL(drm_edid_duplicate);
>
> /*** EDID parsing ***/
>
> -/**
> - * edid_vendor - match a string against EDID's obfuscated vendor field
> - * @edid: EDID to match
> - * @vendor: vendor string
> - *
> - * Returns true if @vendor is in @edid, false otherwise
> - */
> -static bool edid_vendor(const struct edid *edid, const char *vendor)
> -{
> - char edid_vendor[3];
> -
> - edid_vendor[0] = ((edid->mfg_id[0] & 0x7c) >> 2) + '@';
> - edid_vendor[1] = (((edid->mfg_id[0] & 0x3) << 3) |
> - ((edid->mfg_id[1] & 0xe0) >> 5)) + '@';
> - edid_vendor[2] = (edid->mfg_id[1] & 0x1f) + '@';
> -
> - return !strncmp(edid_vendor, vendor, 3);
> -}
> -
> /**
> * edid_get_quirks - return quirk flags for a given EDID
> * @edid: EDID to process
> @@ -2224,14 +2210,13 @@ static bool edid_vendor(const struct edid *edid, const char *vendor)
> */
> static u32 edid_get_quirks(const struct edid *edid)
> {
> + u32 panel_id = edid_extract_panel_id(edid);
> const struct edid_quirk *quirk;
> int i;
>
> for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
> quirk = &edid_quirk_list[i];
> -
> - if (edid_vendor(edid, quirk->vendor) &&
> - (EDID_PRODUCT_ID(edid) == quirk->product_id))
> + if (quirk->panel_id == panel_id)
> return quirk->quirks;
> }

--
Jani Nikula, Intel Open Source Graphics Center

Next message: Sudip Mukherjee: "Re: [PATCH 5.10 000/236] 5.10.65-rc1 review"
Previous message: Sudip Mukherjee: "Re: [PATCH 5.4 000/144] 5.4.146-rc1 review"
In reply to: Doug Anderson: "Re: [PATCH v4 04/15] drm/edid: Use new encoded panel id style for quirks matching"
Next in thread: Douglas Anderson: "[PATCH v4 05/15] ARM: configs: Everyone who had PANEL_SIMPLE now gets PANEL_EDP"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]