On Thu, 8 Jan 2015, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> Tegra132 uses the same GPU as Tegra124 and the same special-case is
> needed to remove clamps. However Tegra132 has a separate chip ID, so in
> order to avoid having to extend the list of chip IDs for the special
> case, add a feature flag to the SoC data.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Reviewed-by: Paul Walmsley <pwalmsley@xxxxxxxxxx>
Nit: not sure I would call it a special-case; to me it's more of an
evolutionary change due to the radically different GPU in T124 & T132.
- Paul
> ---
> drivers/soc/tegra/pmc.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 4bdc654bd747..0f096e76574a 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -88,6 +88,8 @@ struct tegra_pmc_soc {
> const char *const *powergates;
> unsigned int num_cpu_powergates;
> const u8 *cpu_powergates;
> +
> + bool has_gpu_clamps;
> };
>
> /**
> @@ -225,11 +227,11 @@ int tegra_powergate_remove_clamping(int id)
> return -EINVAL;
>
> /*
> - * The Tegra124 GPU has a separate register (with different semantics)
> - * to remove clamps.
> + * On Tegra124 and later, the clamps for the GPU are controlled by a
> + * separate register (with different semantics).
> */
> - if (tegra_get_chip_id() == TEGRA124) {
> - if (id == TEGRA_POWERGATE_3D) {
> + if (id == TEGRA_POWERGATE_3D) {
> + if (pmc->soc->has_gpu_clamps) {
> tegra_pmc_writel(0, GPU_RG_CNTRL);
> return 0;
> }
> @@ -773,6 +775,7 @@ static const struct tegra_pmc_soc tegra20_pmc_soc = {
> .powergates = tegra20_powergates,
> .num_cpu_powergates = 0,
> .cpu_powergates = NULL,
> + .has_gpu_clamps = false,
> };
>
> static const char * const tegra30_powergates[] = {
> @@ -804,6 +807,7 @@ static const struct tegra_pmc_soc tegra30_pmc_soc = {
> .powergates = tegra30_powergates,
> .num_cpu_powergates = ARRAY_SIZE(tegra30_cpu_powergates),
> .cpu_powergates = tegra30_cpu_powergates,
> + .has_gpu_clamps = false,
> };
>
> static const char * const tegra114_powergates[] = {
> @@ -839,6 +843,7 @@ static const struct tegra_pmc_soc tegra114_pmc_soc = {
> .powergates = tegra114_powergates,
> .num_cpu_powergates = ARRAY_SIZE(tegra114_cpu_powergates),
> .cpu_powergates = tegra114_cpu_powergates,
> + .has_gpu_clamps = false,
> };
>
> static const char * const tegra124_powergates[] = {
> @@ -880,6 +885,7 @@ static const struct tegra_pmc_soc tegra124_pmc_soc = {
> .powergates = tegra124_powergates,
> .num_cpu_powergates = ARRAY_SIZE(tegra124_cpu_powergates),
> .cpu_powergates = tegra124_cpu_powergates,
> + .has_gpu_clamps = true,
> };
>
> static const struct of_device_id tegra_pmc_match[] = {
> --
> 2.1.3
>
- Paul
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