On Thu, Sep 21, 2023 at 12:48 PM Ian Ray <ian.ray@xxxxxx> wrote: > > Migrate away from custom EDID parsing and validity checks. > > Note: This is a follow-up to the original RFC by Jani [1]. The first > submission in this series should have been marked v2. > > [1] https://patchwork.freedesktop.org/patch/msgid/20230901102400.552254-1-jani.nikula@xxxxxxxxx > > Co-developed-by: Jani Nikula <jani.nikula@xxxxxxxxx> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > Signed-off-by: Ian Ray <ian.ray@xxxxxx> > --- > .../drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 57 ++++------------------ > 1 file changed, 9 insertions(+), 48 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c > index 460db3c..e93083b 100644 > --- a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c > +++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c > @@ -65,12 +65,11 @@ struct ge_b850v3_lvds { > > static struct ge_b850v3_lvds *ge_b850v3_lvds_ptr; > > -static u8 *stdp2690_get_edid(struct i2c_client *client) > +static int stdp2690_read_block(void *context, u8 *buf, unsigned int block, size_t len) > { > + struct i2c_client *client = context; > struct i2c_adapter *adapter = client->adapter; > - unsigned char start = 0x00; > - unsigned int total_size; > - u8 *block = kmalloc(EDID_LENGTH, GFP_KERNEL); > + unsigned char start = block * EDID_LENGTH; > > struct i2c_msg msgs[] = { > { > @@ -81,53 +80,15 @@ static u8 *stdp2690_get_edid(struct i2c_client *client) > }, { > .addr = client->addr, > .flags = I2C_M_RD, > - .len = EDID_LENGTH, > - .buf = block, > + .len = len, > + .buf = buf, > } > }; > > - if (!block) > - return NULL; > + if (i2c_transfer(adapter, msgs, 2) != 2) > + return -1; > > - if (i2c_transfer(adapter, msgs, 2) != 2) { > - DRM_ERROR("Unable to read EDID.\n"); > - goto err; > - } > - > - if (!drm_edid_block_valid(block, 0, false, NULL)) { > - DRM_ERROR("Invalid EDID data\n"); > - goto err; > - } > - > - total_size = (block[EDID_EXT_BLOCK_CNT] + 1) * EDID_LENGTH; > - if (total_size > EDID_LENGTH) { > - kfree(block); > - block = kmalloc(total_size, GFP_KERNEL); > - if (!block) > - return NULL; > - > - /* Yes, read the entire buffer, and do not skip the first > - * EDID_LENGTH bytes. > - */ > - start = 0x00; > - msgs[1].len = total_size; > - msgs[1].buf = block; > - > - if (i2c_transfer(adapter, msgs, 2) != 2) { > - DRM_ERROR("Unable to read EDID extension blocks.\n"); > - goto err; > - } > - if (!drm_edid_block_valid(block, 1, false, NULL)) { > - DRM_ERROR("Invalid EDID data\n"); > - goto err; > - } > - } > - > - return block; > - > -err: > - kfree(block); > - return NULL; > + return 0; > } > > static struct edid *ge_b850v3_lvds_get_edid(struct drm_bridge *bridge, > @@ -137,7 +98,7 @@ static struct edid *ge_b850v3_lvds_get_edid(struct drm_bridge *bridge, > > client = ge_b850v3_lvds_ptr->stdp2690_i2c; > > - return (struct edid *)stdp2690_get_edid(client); > + return drm_do_get_edid(connector, stdp2690_read_block, client); > } > > static int ge_b850v3_lvds_get_modes(struct drm_connector *connector) Reviewed-by: Robert Foss <rfoss@xxxxxxxxxx>
