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: sta...@vger.kernel.org # v5.1+
> Fixes: e8391453e27f ("mmc: sdhci-tegra: drop ->get_ro() implementation")
> Signed-off-by: Dmitry Osipenko <dig...@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,
>
