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SubjectRe: [Linux-stm32] [PATCH v8 08/10] drm: stm: dw-mipi-dsi: let the bridge handle the HW version check
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Hi Adrian,
and thank you very much for the patchset.
Thank you also for having tested it on STM32F769 and STM32MP1.
Sorry for the late response, Yannick and I will review it as soon as
possible and we will keep you posted.
Note: Do not hesitate to put us in copy for the next version
(philippe.cornu@st.com, yannick.fertre@st.com)
Regards,
Philippe :-)


On 4/27/20 10:19 AM, Adrian Ratiu wrote:
> The stm mipi-dsi platform driver added a version test in
> commit fa6251a747b7 ("drm/stm: dsi: check hardware version")
> so that HW revisions other than v1.3x get rejected. The rockchip
> driver had no such check and just assumed register layouts are
> v1.3x compatible.
>
> Having such tests was a good idea because only v130/v131 layouts
> were supported at the time, however since adding multiple layout
> support in the bridge, the version is automatically checked for
> all drivers, compatible layouts get picked and unsupported HW is
> automatically rejected by the bridge, so there's no use keeping
> the test in the stm driver.
>
> The main reason prompting this change is that the stm driver
> test immediately disabled the peripheral clock after reading
> the version, making the bridge read version 0x0 immediately
> after in its own probe(), so we move the clock disabling after
> the bridge does the version test.
>
> Tested on STM32F769 and STM32MP1.
>
> Cc: linux-stm32@st-md-mailman.stormreply.com
> Reported-by: Adrian Pop <pop.adrian61@gmail.com>
> Tested-by: Adrian Pop <pop.adrian61@gmail.com>
> Tested-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
> ---
> New in v6.
> ---
> drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 12 +++---------
> 1 file changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> index 2e1f2664495d0..7218e405d7e2b 100644
> --- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> +++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> @@ -402,15 +402,6 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
> goto err_dsi_probe;
> }
>
> - dsi->hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
> - clk_disable_unprepare(pclk);
> -
> - if (dsi->hw_version != HWVER_130 && dsi->hw_version != HWVER_131) {
> - ret = -ENODEV;
> - DRM_ERROR("bad dsi hardware version\n");
> - goto err_dsi_probe;
> - }
> -
> dw_mipi_dsi_stm_plat_data.base = dsi->base;
> dw_mipi_dsi_stm_plat_data.priv_data = dsi;
>
> @@ -423,6 +414,9 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
> goto err_dsi_probe;
> }
>
> + dsi->hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
> + clk_disable_unprepare(pclk);
> +
> return 0;
>
> err_dsi_probe:
>
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