* Re: [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation"
2019-08-08 22:24 [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation" Dmitry Osipenko
@ 2019-08-12 8:33 ` Adrian Hunter
2019-08-12 9:06 ` Thierry Reding
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Adrian Hunter @ 2019-08-12 8:33 UTC (permalink / raw)
To: Dmitry Osipenko, Thierry Reding, Jonathan Hunter, Ulf Hansson
Cc: linux-mmc, linux-tegra, linux-kernel, Thierry Reding
On 9/08/19 1:24 AM, Dmitry Osipenko wrote:
> The WRITE_PROTECT bit is always in a "protected mode" on Tegra and
> WP-GPIO state need to be used instead. In a case of the GPIO absence,
> write-enable should be assumed. External SD is writable once again as
> a result of this patch because the offending commit changed behaviour for
> the case of a missing WP-GPIO to fall back to WRITE_PROTECT bit-checking,
> which is incorrect for Tegra.
>
> Cc: stable@vger.kernel.org # v5.1+
> Fixes: e8391453e27f ("mmc: sdhci-tegra: drop ->get_ro() implementation")
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Can we get an Ack from someone from Nvidia
> ---
> drivers/mmc/host/sdhci-tegra.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index f4d4761cf20a..02d8f524bb9e 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -258,6 +258,16 @@ static void tegra210_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
> }
> }
>
> +static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
> +{
> + /*
> + * Write-enable shall be assumed if GPIO is missing in a board's
> + * device-tree because SDHCI's WRITE_PROTECT bit doesn't work on
> + * Tegra.
> + */
> + return mmc_gpio_get_ro(host->mmc);
> +}
> +
> static bool tegra_sdhci_is_pad_and_regulator_valid(struct sdhci_host *host)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -1224,6 +1234,7 @@ static const struct cqhci_host_ops sdhci_tegra_cqhci_ops = {
> };
>
> static const struct sdhci_ops tegra_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> .write_l = tegra_sdhci_writel,
> .set_clock = tegra_sdhci_set_clock,
> @@ -1279,6 +1290,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra30 = {
> };
>
> static const struct sdhci_ops tegra114_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> .write_w = tegra_sdhci_writew,
> .write_l = tegra_sdhci_writel,
> @@ -1332,6 +1344,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra124 = {
> };
>
> static const struct sdhci_ops tegra210_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> .write_w = tegra210_sdhci_writew,
> .write_l = tegra_sdhci_writel,
> @@ -1366,6 +1379,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra210 = {
> };
>
> static const struct sdhci_ops tegra186_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> .write_l = tegra_sdhci_writel,
> .set_clock = tegra_sdhci_set_clock,
>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation"
2019-08-08 22:24 [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation" Dmitry Osipenko
2019-08-12 8:33 ` Adrian Hunter
@ 2019-08-12 9:06 ` Thierry Reding
2019-08-12 9:36 ` Adrian Hunter
2019-08-21 15:11 ` Ulf Hansson
3 siblings, 0 replies; 5+ messages in thread
From: Thierry Reding @ 2019-08-12 9:06 UTC (permalink / raw)
To: Dmitry Osipenko
Cc: Jonathan Hunter, Adrian Hunter, Ulf Hansson, linux-mmc,
linux-tegra, linux-kernel
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On Fri, Aug 09, 2019 at 01:24:30AM +0300, Dmitry Osipenko wrote:
> The WRITE_PROTECT bit is always in a "protected mode" on Tegra and
> WP-GPIO state need to be used instead. In a case of the GPIO absence,
> write-enable should be assumed. External SD is writable once again as
> a result of this patch because the offending commit changed behaviour for
> the case of a missing WP-GPIO to fall back to WRITE_PROTECT bit-checking,
> which is incorrect for Tegra.
>
> Cc: stable@vger.kernel.org # v5.1+
> Fixes: e8391453e27f ("mmc: sdhci-tegra: drop ->get_ro() implementation")
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
> drivers/mmc/host/sdhci-tegra.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
Acked-by: Thierry Reding <treding@nvidia.com>
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^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation"
2019-08-08 22:24 [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation" Dmitry Osipenko
2019-08-12 8:33 ` Adrian Hunter
2019-08-12 9:06 ` Thierry Reding
@ 2019-08-12 9:36 ` Adrian Hunter
2019-08-21 15:11 ` Ulf Hansson
3 siblings, 0 replies; 5+ messages in thread
From: Adrian Hunter @ 2019-08-12 9:36 UTC (permalink / raw)
To: Dmitry Osipenko, Thierry Reding, Jonathan Hunter, Ulf Hansson
Cc: linux-mmc, linux-tegra, linux-kernel
On 9/08/19 1:24 AM, Dmitry Osipenko wrote:
> The WRITE_PROTECT bit is always in a "protected mode" on Tegra and
> WP-GPIO state need to be used instead. In a case of the GPIO absence,
> write-enable should be assumed. External SD is writable once again as
> a result of this patch because the offending commit changed behaviour for
> the case of a missing WP-GPIO to fall back to WRITE_PROTECT bit-checking,
> which is incorrect for Tegra.
>
> Cc: stable@vger.kernel.org # v5.1+
> Fixes: e8391453e27f ("mmc: sdhci-tegra: drop ->get_ro() implementation")
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation"
2019-08-08 22:24 [PATCH v1] Revert "mmc: sdhci-tegra: drop ->get_ro() implementation" Dmitry Osipenko
` (2 preceding siblings ...)
2019-08-12 9:36 ` Adrian Hunter
@ 2019-08-21 15:11 ` Ulf Hansson
3 siblings, 0 replies; 5+ messages in thread
From: Ulf Hansson @ 2019-08-21 15:11 UTC (permalink / raw)
To: Dmitry Osipenko
Cc: Thierry Reding, Jonathan Hunter, Adrian Hunter,
linux-mmc@vger.kernel.org, linux-tegra, Linux Kernel Mailing List
On Fri, 9 Aug 2019 at 00:25, Dmitry Osipenko <digetx@gmail.com> wrote:
>
> The WRITE_PROTECT bit is always in a "protected mode" on Tegra and
> WP-GPIO state need to be used instead. In a case of the GPIO absence,
> write-enable should be assumed. External SD is writable once again as
> a result of this patch because the offending commit changed behaviour for
> the case of a missing WP-GPIO to fall back to WRITE_PROTECT bit-checking,
> which is incorrect for Tegra.
>
> Cc: stable@vger.kernel.org # v5.1+
> Fixes: e8391453e27f ("mmc: sdhci-tegra: drop ->get_ro() implementation")
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Applied for fixes, thanks!
Kind regards
Uffe
> ---
> drivers/mmc/host/sdhci-tegra.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index f4d4761cf20a..02d8f524bb9e 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -258,6 +258,16 @@ static void tegra210_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
> }
> }
>
> +static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
> +{
> + /*
> + * Write-enable shall be assumed if GPIO is missing in a board's
> + * device-tree because SDHCI's WRITE_PROTECT bit doesn't work on
> + * Tegra.
> + */
> + return mmc_gpio_get_ro(host->mmc);
> +}
> +
> static bool tegra_sdhci_is_pad_and_regulator_valid(struct sdhci_host *host)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -1224,6 +1234,7 @@ static const struct cqhci_host_ops sdhci_tegra_cqhci_ops = {
> };
>
> static const struct sdhci_ops tegra_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> .write_l = tegra_sdhci_writel,
> .set_clock = tegra_sdhci_set_clock,
> @@ -1279,6 +1290,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra30 = {
> };
>
> static const struct sdhci_ops tegra114_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> .write_w = tegra_sdhci_writew,
> .write_l = tegra_sdhci_writel,
> @@ -1332,6 +1344,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra124 = {
> };
>
> static const struct sdhci_ops tegra210_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> .write_w = tegra210_sdhci_writew,
> .write_l = tegra_sdhci_writel,
> @@ -1366,6 +1379,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra210 = {
> };
>
> static const struct sdhci_ops tegra186_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> .write_l = tegra_sdhci_writel,
> .set_clock = tegra_sdhci_set_clock,
> --
> 2.22.0
>
^ permalink raw reply [flat|nested] 5+ messages in thread